diff --git a/.husky/pre-push b/.husky/pre-push
new file mode 100644
index 0000000..d8fe6f1
--- /dev/null
+++ b/.husky/pre-push
@@ -0,0 +1,4 @@
+#!/usr/bin/env sh
+. "$(dirname -- "$0")/_/husky.sh"
+
+npm run test:run
diff --git a/package-lock.json b/package-lock.json
index 2c68e35..15adab2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -44,6 +44,7 @@
       },
       "devDependencies": {
         "@tailwindcss/postcss": "^4",
+        "@testing-library/dom": "^10.4.1",
         "@testing-library/jest-dom": "^6.9.1",
         "@testing-library/react": "^16.3.0",
         "@testing-library/user-event": "^14.6.1",
@@ -52,11 +53,13 @@
         "@types/react": "^19",
         "@types/react-dom": "^19",
         "@vitejs/plugin-react": "^5.1.0",
+        "@vitest/coverage-v8": "^4.0.6",
         "eslint": "^9.39.0",
         "eslint-config-next": "16.0.1",
         "husky": "^9.1.7",
         "jsdom": "^27.1.0",
         "lint-staged": "^16.2.6",
+        "msw": "^2.13.6",
         "prettier": "^3.6.2",
         "tailwindcss": "^4",
         "tw-animate-css": "^1.4.0",
@@ -1183,6 +1186,16 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@bcoe/v8-coverage": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@bcoe/v8-coverage/-/v8-coverage-1.0.2.tgz",
+      "integrity": "sha512-6zABk/ECA/QYSCQ1NGiVwwbQerUCZ+TQbp64Q3AgmfNvurHH0j8TtXa1qbShXA6qqkpAj4V5W8pP6mLe1mcMqA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/@csstools/color-helpers": {
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/@csstools/color-helpers/-/color-helpers-5.1.0.tgz",
@@ -2493,6 +2506,93 @@
         "url": "https://opencollective.com/libvips"
       }
     },
+    "node_modules/@inquirer/ansi": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/@inquirer/ansi/-/ansi-2.0.5.tgz",
+      "integrity": "sha512-doc2sWgJpbFQ64UflSVd17ibMGDuxO1yKgOgLMwavzESnXjFWJqUeG8saYosqKpHp4kWiM5x1nXvEjbpx90gzw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=23.5.0 || ^22.13.0 || ^21.7.0 || ^20.12.0"
+      }
+    },
+    "node_modules/@inquirer/confirm": {
+      "version": "6.0.12",
+      "resolved": "https://registry.npmjs.org/@inquirer/confirm/-/confirm-6.0.12.tgz",
+      "integrity": "sha512-h9FgGun3QwVYNj5TWIZZ+slii73bMoBFjPfVIGtnFuL4t8gBiNDV9PcSfIzkuxvgquJKt9nr1QzszpBzTbH8Og==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@inquirer/core": "^11.1.9",
+        "@inquirer/type": "^4.0.5"
+      },
+      "engines": {
+        "node": ">=23.5.0 || ^22.13.0 || ^21.7.0 || ^20.12.0"
+      },
+      "peerDependencies": {
+        "@types/node": ">=18"
+      },
+      "peerDependenciesMeta": {
+        "@types/node": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@inquirer/core": {
+      "version": "11.1.9",
+      "resolved": "https://registry.npmjs.org/@inquirer/core/-/core-11.1.9.tgz",
+      "integrity": "sha512-BDE4fG22uYh1bGSifcj7JSx119TVYNViMhMu85usp4Fswrzh6M0DV3yld64jA98uOAa2GSQ4Bg4bZRm2d2cwSg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@inquirer/ansi": "^2.0.5",
+        "@inquirer/figures": "^2.0.5",
+        "@inquirer/type": "^4.0.5",
+        "cli-width": "^4.1.0",
+        "fast-wrap-ansi": "^0.2.0",
+        "mute-stream": "^3.0.0",
+        "signal-exit": "^4.1.0"
+      },
+      "engines": {
+        "node": ">=23.5.0 || ^22.13.0 || ^21.7.0 || ^20.12.0"
+      },
+      "peerDependencies": {
+        "@types/node": ">=18"
+      },
+      "peerDependenciesMeta": {
+        "@types/node": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@inquirer/figures": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/@inquirer/figures/-/figures-2.0.5.tgz",
+      "integrity": "sha512-NsSs4kzfm12lNetHwAn3GEuH317IzpwrMCbOuMIVytpjnJ90YYHNwdRgYGuKmVxwuIqSgqk3M5qqQt1cDk0tGQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=23.5.0 || ^22.13.0 || ^21.7.0 || ^20.12.0"
+      }
+    },
+    "node_modules/@inquirer/type": {
+      "version": "4.0.5",
+      "resolved": "https://registry.npmjs.org/@inquirer/type/-/type-4.0.5.tgz",
+      "integrity": "sha512-aetVUNeKNc/VriqXlw1NRSW0zhMBB0W4bNbWRJgzRl/3d0QNDQFfk0GO5SDdtjMZVg6o8ZKEiadd7SCCzoOn5Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=23.5.0 || ^22.13.0 || ^21.7.0 || ^20.12.0"
+      },
+      "peerDependencies": {
+        "@types/node": ">=18"
+      },
+      "peerDependenciesMeta": {
+        "@types/node": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@jridgewell/gen-mapping": {
       "version": "0.3.13",
       "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.13.tgz",
@@ -2543,6 +2643,31 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
+    "node_modules/@mswjs/interceptors": {
+      "version": "0.41.6",
+      "resolved": "https://registry.npmjs.org/@mswjs/interceptors/-/interceptors-0.41.6.tgz",
+      "integrity": "sha512-qmDvJIjcNsZ6tXWy2G9yuCgMPTTn35GMA3dPpSLm7QJVpbQzYdw0ALy1bKoivXnEM3U93/OrK+/M719b+fg84Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@open-draft/deferred-promise": "^2.2.0",
+        "@open-draft/logger": "^0.3.0",
+        "@open-draft/until": "^2.0.0",
+        "is-node-process": "^1.2.0",
+        "outvariant": "^1.4.3",
+        "strict-event-emitter": "^0.5.1"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@mswjs/interceptors/node_modules/@open-draft/deferred-promise": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/@open-draft/deferred-promise/-/deferred-promise-2.2.0.tgz",
+      "integrity": "sha512-CecwLWx3rhxVQF6V4bAgPS5t+So2sTbPgAzafKkVizyi7tlwpcFpdFqq+wqF2OwNBmqFuu6tOyouTuxgpMfzmA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@napi-rs/wasm-runtime": {
       "version": "0.2.12",
       "resolved": "https://registry.npmjs.org/@napi-rs/wasm-runtime/-/wasm-runtime-0.2.12.tgz",
@@ -2748,6 +2873,31 @@
         "node": ">=12.4.0"
       }
     },
+    "node_modules/@open-draft/deferred-promise": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/@open-draft/deferred-promise/-/deferred-promise-3.0.0.tgz",
+      "integrity": "sha512-XW375UK8/9SqUVNVa6M0yEy8+iTi4QN5VZ7aZuRFQmy76LRwI9wy5F4YIBU6T+eTe2/DNDo8tqu8RHlwLHM6RA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@open-draft/logger": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/@open-draft/logger/-/logger-0.3.0.tgz",
+      "integrity": "sha512-X2g45fzhxH238HKO4xbSr7+wBS8Fvw6ixhTDuvLd5mqh6bJJCFAPwU9mPDxbcrRtfxv4u5IHCEH77BmxvXmmxQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "is-node-process": "^1.2.0",
+        "outvariant": "^1.4.0"
+      }
+    },
+    "node_modules/@open-draft/until": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/@open-draft/until/-/until-2.1.0.tgz",
+      "integrity": "sha512-U69T3ItWHvLwGg5eJ0n3I62nWuE6ilHlmz7zM0npLBRvPRd7e6NYmg54vvRtP5mZG7kZqZCFVdsTWo7BPtBujg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@prisma/client": {
       "version": "6.19.0",
       "resolved": "https://registry.npmjs.org/@prisma/client/-/client-6.19.0.tgz",
@@ -5726,6 +5876,43 @@
         "tailwindcss": "4.1.16"
       }
     },
+    "node_modules/@testing-library/dom": {
+      "version": "10.4.1",
+      "resolved": "https://registry.npmjs.org/@testing-library/dom/-/dom-10.4.1.tgz",
+      "integrity": "sha512-o4PXJQidqJl82ckFaXUeoAW+XysPLauYI43Abki5hABd853iMhitooc6znOnczgbTYmEP6U6/y1ZyKAIsvMKGg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/code-frame": "^7.10.4",
+        "@babel/runtime": "^7.12.5",
+        "@types/aria-query": "^5.0.1",
+        "aria-query": "5.3.0",
+        "dom-accessibility-api": "^0.5.9",
+        "lz-string": "^1.5.0",
+        "picocolors": "1.1.1",
+        "pretty-format": "^27.0.2"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@testing-library/dom/node_modules/aria-query": {
+      "version": "5.3.0",
+      "resolved": "https://registry.npmjs.org/aria-query/-/aria-query-5.3.0.tgz",
+      "integrity": "sha512-b0P0sZPKtyu8HkeRAfCq0IfURZK+SuwMjY1UXGBU27wpAiTwQAIlq56IbIO+ytk/JjS1fMR14ee5WBBfKi5J6A==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "dequal": "^2.0.3"
+      }
+    },
+    "node_modules/@testing-library/dom/node_modules/dom-accessibility-api": {
+      "version": "0.5.16",
+      "resolved": "https://registry.npmjs.org/dom-accessibility-api/-/dom-accessibility-api-0.5.16.tgz",
+      "integrity": "sha512-X7BJ2yElsnOJ30pZF4uIIDfBEVgF4XEBxL9Bxhy6dnrm5hkzqmsWHGTiHqRiITNhMyFLyAiWndIJP7Z1NTteDg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@testing-library/jest-dom": {
       "version": "6.9.1",
       "resolved": "https://registry.npmjs.org/@testing-library/jest-dom/-/jest-dom-6.9.1.tgz",
@@ -6246,6 +6433,13 @@
         "tslib": "^2.4.0"
       }
     },
+    "node_modules/@types/aria-query": {
+      "version": "5.0.4",
+      "resolved": "https://registry.npmjs.org/@types/aria-query/-/aria-query-5.0.4.tgz",
+      "integrity": "sha512-rfT93uj5s0PRL7EzccGMs3brplhcrghnDoV26NqKhCAS1hVo+WdNsPvE/yb6ilfr5hi2MEk6d5EWJTKdxg8jVw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@types/babel__core": {
       "version": "7.20.5",
       "resolved": "https://registry.npmjs.org/@types/babel__core/-/babel__core-7.20.5.tgz",
@@ -6393,6 +6587,23 @@
         "@types/react": "^19.2.0"
       }
     },
+    "node_modules/@types/set-cookie-parser": {
+      "version": "2.4.10",
+      "resolved": "https://registry.npmjs.org/@types/set-cookie-parser/-/set-cookie-parser-2.4.10.tgz",
+      "integrity": "sha512-GGmQVGpQWUe5qglJozEjZV/5dyxbOOZ0LHe/lqyWssB88Y4svNfst0uqBVscdDeIKl5Jy5+aPSvy7mI9tYRguw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/statuses": {
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/@types/statuses/-/statuses-2.0.6.tgz",
+      "integrity": "sha512-xMAgYwceFhRA2zY+XbEA7mxYbA093wdiW8Vu6gZPGWy9cmOyU9XesH1tNcEWsKFd5Vzrqx5T3D38PWx1FIIXkA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@types/use-sync-external-store": {
       "version": "0.0.6",
       "resolved": "https://registry.npmjs.org/@types/use-sync-external-store/-/use-sync-external-store-0.0.6.tgz",
@@ -6964,6 +7175,38 @@
         "vite": "^4.2.0 || ^5.0.0 || ^6.0.0 || ^7.0.0"
       }
     },
+    "node_modules/@vitest/coverage-v8": {
+      "version": "4.0.6",
+      "resolved": "https://registry.npmjs.org/@vitest/coverage-v8/-/coverage-v8-4.0.6.tgz",
+      "integrity": "sha512-cv6pFXj9/Otk7q1Ocoj8k3BUVVwnFr3jqcqpwYrU5LkKClU9DpaMEdX+zptx/RyIJS+/VpoxMWmfISXchmVDPQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@bcoe/v8-coverage": "^1.0.2",
+        "@vitest/utils": "4.0.6",
+        "ast-v8-to-istanbul": "^0.3.5",
+        "debug": "^4.4.3",
+        "istanbul-lib-coverage": "^3.2.2",
+        "istanbul-lib-report": "^3.0.1",
+        "istanbul-lib-source-maps": "^5.0.6",
+        "istanbul-reports": "^3.2.0",
+        "magicast": "^0.3.5",
+        "std-env": "^3.9.0",
+        "tinyrainbow": "^3.0.3"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@vitest/browser": "4.0.6",
+        "vitest": "4.0.6"
+      },
+      "peerDependenciesMeta": {
+        "@vitest/browser": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@vitest/expect": {
       "version": "4.0.6",
       "resolved": "https://registry.npmjs.org/@vitest/expect/-/expect-4.0.6.tgz",
@@ -7375,6 +7618,25 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/ast-v8-to-istanbul": {
+      "version": "0.3.12",
+      "resolved": "https://registry.npmjs.org/ast-v8-to-istanbul/-/ast-v8-to-istanbul-0.3.12.tgz",
+      "integrity": "sha512-BRRC8VRZY2R4Z4lFIL35MwNXmwVqBityvOIwETtsCSwvjl0IdgFsy9NhdaA6j74nUdtJJlIypeRhpDam19Wq3g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/trace-mapping": "^0.3.31",
+        "estree-walker": "^3.0.3",
+        "js-tokens": "^10.0.0"
+      }
+    },
+    "node_modules/ast-v8-to-istanbul/node_modules/js-tokens": {
+      "version": "10.0.0",
+      "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-10.0.0.tgz",
+      "integrity": "sha512-lM/UBzQmfJRo9ABXbPWemivdCW8V2G8FHaHdypQaIy523snUjog0W71ayWXTjiR+ixeMyVHN2XcpnTd/liPg/Q==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/async-function": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/async-function/-/async-function-1.0.0.tgz",
@@ -7742,12 +8004,110 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/cli-width": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-4.1.0.tgz",
+      "integrity": "sha512-ouuZd4/dm2Sw5Gmqy6bGyNNNe1qt9RpmxveLSO7KcgsTnU7RXfsw+/bukWGo1abgBiMAic068rclZsO4IWmmxQ==",
+      "dev": true,
+      "license": "ISC",
+      "engines": {
+        "node": ">= 12"
+      }
+    },
     "node_modules/client-only": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/client-only/-/client-only-0.0.1.tgz",
       "integrity": "sha512-IV3Ou0jSMzZrd3pZ48nLkT9DA7Ag1pnPzaiQhpW7c3RbcqqzvzzVu+L8gfqMp/8IM2MQtSiqaCxrrcfu8I8rMA==",
       "license": "MIT"
     },
+    "node_modules/cliui": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-8.0.1.tgz",
+      "integrity": "sha512-BSeNnyus75C4//NQ9gQt1/csTXyo/8Sb+afLAkzAptFuMsod9HFokGNudZpi/oQV73hnVK+sR+5PVRMd+Dr7YQ==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "string-width": "^4.2.0",
+        "strip-ansi": "^6.0.1",
+        "wrap-ansi": "^7.0.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/cliui/node_modules/ansi-regex": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/cliui/node_modules/emoji-regex": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
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+      "dev": true,
+      "license": "MIT"
+    },
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+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
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+    },
+    "node_modules/cliui/node_modules/string-width": {
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "emoji-regex": "^8.0.0",
+        "is-fullwidth-code-point": "^3.0.0",
+        "strip-ansi": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/cliui/node_modules/strip-ansi": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
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+      "license": "MIT",
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+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
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+      "dev": true,
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+      "resolved": "https://registry.npmjs.org/rettime/-/rettime-0.11.8.tgz",
+      "integrity": "sha512-0fERGXktJTyJ+h8fBEiPxHPEFOu0h15JY7JtwrOVqR5K+vb99ho6IyOo7ekLS3h4sJCzIDy4VWKIbZUfe9njmg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/reusify": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/reusify/-/reusify-1.1.0.tgz",
@@ -12199,6 +12881,13 @@
         "semver": "bin/semver.js"
       }
     },
+    "node_modules/set-cookie-parser": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/set-cookie-parser/-/set-cookie-parser-3.1.0.tgz",
+      "integrity": "sha512-kjnC1DXBHcxaOaOXBHBeRtltsDG2nUiUni+jP92M9gYdW12rsmx92UsfpH7o5tDRs7I1ZZPSQJQGv3UaRfCiuw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/set-function-length": {
       "version": "1.2.2",
       "resolved": "https://registry.npmjs.org/set-function-length/-/set-function-length-1.2.2.tgz",
@@ -12488,6 +13177,16 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/statuses": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.2.tgz",
+      "integrity": "sha512-DvEy55V3DB7uknRo+4iOGT5fP1slR8wQohVdknigZPMpMstaKJQWhwiYBACJE3Ul2pTnATihhBYnRhZQHGBiRw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/std-env": {
       "version": "3.10.0",
       "resolved": "https://registry.npmjs.org/std-env/-/std-env-3.10.0.tgz",
@@ -12509,6 +13208,13 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/strict-event-emitter": {
+      "version": "0.5.1",
+      "resolved": "https://registry.npmjs.org/strict-event-emitter/-/strict-event-emitter-0.5.1.tgz",
+      "integrity": "sha512-vMgjE/GGEPEFnhFub6pa4FmJBRBVOLpIII2hvCZ8Kzb7K0hlHo7mQv6xYrBvCL2LtAIBwFUK8wvuJgTVSQ5MFQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/string-argv": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/string-argv/-/string-argv-0.3.2.tgz",
@@ -12770,6 +13476,19 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/tagged-tag": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/tagged-tag/-/tagged-tag-1.0.0.tgz",
+      "integrity": "sha512-yEFYrVhod+hdNyx7g5Bnkkb0G6si8HJurOoOEgC8B/O0uXLHlaey/65KRv6cuWBNhBgHKAROVpc7QyYqE5gFng==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=20"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/tailwind-merge": {
       "version": "3.3.1",
       "resolved": "https://registry.npmjs.org/tailwind-merge/-/tailwind-merge-3.3.1.tgz",
@@ -12876,9 +13595,9 @@
       }
     },
     "node_modules/tough-cookie": {
-      "version": "6.0.0",
-      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-6.0.0.tgz",
-      "integrity": "sha512-kXuRi1mtaKMrsLUxz3sQYvVl37B0Ns6MzfrtV5DvJceE9bPyspOqk9xxv7XbZWcfLWbFmm997vl83qUWVJA64w==",
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-6.0.1.tgz",
+      "integrity": "sha512-LktZQb3IeoUWB9lqR5EWTHgW/VTITCXg4D21M+lvybRVdylLrRMnqaIONLVb5mav8vM19m44HIcGq4qASeu2Qw==",
       "dev": true,
       "license": "BSD-3-Clause",
       "dependencies": {
@@ -12969,6 +13688,22 @@
         "node": ">= 0.8.0"
       }
     },
+    "node_modules/type-fest": {
+      "version": "5.6.0",
+      "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-5.6.0.tgz",
+      "integrity": "sha512-8ZiHFm91orbSAe2PSAiSVBVko18pbhbiB3U9GglSzF/zCGkR+rxpHx6sEMCUm4kxY4LjDIUGgCfUMtwfZfjfUA==",
+      "dev": true,
+      "license": "(MIT OR CC0-1.0)",
+      "dependencies": {
+        "tagged-tag": "^1.0.0"
+      },
+      "engines": {
+        "node": ">=20"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/typed-array-buffer": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/typed-array-buffer/-/typed-array-buffer-1.0.3.tgz",
@@ -13152,6 +13887,16 @@
         "@unrs/resolver-binding-win32-x64-msvc": "1.11.1"
       }
     },
+    "node_modules/until-async": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/until-async/-/until-async-3.0.2.tgz",
+      "integrity": "sha512-IiSk4HlzAMqTUseHHe3VhIGyuFmN90zMTpD3Z3y8jeQbzLIq500MVM7Jq2vUAnTKAFPJrqwkzr6PoTcPhGcOiw==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/kettanaito"
+      }
+    },
     "node_modules/update-browserslist-db": {
       "version": "1.1.4",
       "resolved": "https://registry.npmjs.org/update-browserslist-db/-/update-browserslist-db-1.1.4.tgz",
@@ -13691,6 +14436,16 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/y18n": {
+      "version": "5.0.8",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
+      "integrity": "sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==",
+      "dev": true,
+      "license": "ISC",
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/yallist": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
@@ -13714,6 +14469,90 @@
         "url": "https://github.com/sponsors/eemeli"
       }
     },
+    "node_modules/yargs": {
+      "version": "17.7.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.2.tgz",
+      "integrity": "sha512-7dSzzRQ++CKnNI/krKnYRV7JKKPUXMEh61soaHKg9mrWEhzFWhFnxPxGl+69cD1Ou63C13NUPCnmIcrvqCuM6w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "cliui": "^8.0.1",
+        "escalade": "^3.1.1",
+        "get-caller-file": "^2.0.5",
+        "require-directory": "^2.1.1",
+        "string-width": "^4.2.3",
+        "y18n": "^5.0.5",
+        "yargs-parser": "^21.1.1"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/yargs-parser": {
+      "version": "21.1.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-21.1.1.tgz",
+      "integrity": "sha512-tVpsJW7DdjecAiFpbIB1e3qxIQsE6NoPc5/eTdrbbIC4h0LVsWhnoa3g+m2HclBIujHzsxZ4VJVA+GUuc2/LBw==",
+      "dev": true,
+      "license": "ISC",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/yargs/node_modules/ansi-regex": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/yargs/node_modules/emoji-regex": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+      "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/yargs/node_modules/is-fullwidth-code-point": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz",
+      "integrity": "sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/yargs/node_modules/string-width": {
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+      "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "emoji-regex": "^8.0.0",
+        "is-fullwidth-code-point": "^3.0.0",
+        "strip-ansi": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/yargs/node_modules/strip-ansi": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/yocto-queue": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
diff --git a/package.json b/package.json
index a3025a6..c5849ef 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,9 @@
     "prepare": "husky",
     "prettier:check": "prettier --check .",
     "prettier:fix": "prettier --write .",
-    "test": "vitest"
+    "test": "vitest",
+    "test:run": "vitest run",
+    "test:coverage": "vitest run --coverage"
   },
   "dependencies": {
     "@prisma/client": "^6.19.0",
@@ -49,6 +51,7 @@
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4",
+    "@testing-library/dom": "^10.4.1",
     "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/react": "^16.3.0",
     "@testing-library/user-event": "^14.6.1",
@@ -57,11 +60,13 @@
     "@types/react": "^19",
     "@types/react-dom": "^19",
     "@vitejs/plugin-react": "^5.1.0",
+    "@vitest/coverage-v8": "^4.0.6",
     "eslint": "^9.39.0",
     "eslint-config-next": "16.0.1",
     "husky": "^9.1.7",
     "jsdom": "^27.1.0",
     "lint-staged": "^16.2.6",
+    "msw": "^2.13.6",
     "prettier": "^3.6.2",
     "tailwindcss": "^4",
     "tw-animate-css": "^1.4.0",
diff --git a/src/components/test/placeholder.test.ts b/src/components/test/placeholder.test.ts
deleted file mode 100644
index 7fd10c7..0000000
--- a/src/components/test/placeholder.test.ts
+++ /dev/null
@@ -1,7 +0,0 @@
-import { describe, it, expect } from "vitest";
-
-describe("Placeholder CI Test", () => {
-  it("should always pass", () => {
-    expect(true).toBe(true);
-  });
-});
diff --git a/tests/__mocks__/prisma.ts b/tests/__mocks__/prisma.ts
new file mode 100644
index 0000000..7dac3f2
--- /dev/null
+++ b/tests/__mocks__/prisma.ts
@@ -0,0 +1,24 @@
+import { vi } from "vitest";
+
+export const mockPrisma = {
+  manager: {
+    findUnique: vi.fn(),
+    create: vi.fn(),
+    update: vi.fn(),
+    delete: vi.fn(),
+  },
+  user: {
+    findUnique: vi.fn(),
+    create: vi.fn(),
+    update: vi.fn(),
+    delete: vi.fn(),
+  },
+  employee: {
+    findUnique: vi.fn(),
+    findMany: vi.fn(),
+    create: vi.fn(),
+    update: vi.fn(),
+    delete: vi.fn(),
+  },
+  $disconnect: vi.fn(),
+};
diff --git a/tests/__mocks__/supabase.ts b/tests/__mocks__/supabase.ts
new file mode 100644
index 0000000..8e0209a
--- /dev/null
+++ b/tests/__mocks__/supabase.ts
@@ -0,0 +1,28 @@
+import { vi } from "vitest";
+
+export const mockAuth = {
+  signInWithPassword: vi.fn(),
+  signUp: vi.fn(),
+  signOut: vi.fn(),
+};
+
+export const mockStorage = {
+  from: vi.fn().mockReturnValue({
+    upload: vi.fn(),
+    remove: vi.fn(),
+    getPublicUrl: vi
+      .fn()
+      .mockReturnValue({ data: { publicUrl: "https://example.com/avatar.jpg" } }),
+  }),
+};
+
+export const mockSupabaseClient = {
+  auth: mockAuth,
+  storage: mockStorage,
+};
+
+// Used by vi.mock('@/src/lib/supabase/server', ...)
+export const createClient = vi.fn().mockResolvedValue(mockSupabaseClient);
+
+// Used by vi.mock('@/src/lib/supabase/client', ...)
+export const createClientClient = vi.fn().mockReturnValue(mockSupabaseClient);
diff --git a/tests/api/auth/login.test.ts b/tests/api/auth/login.test.ts
new file mode 100644
index 0000000..a41cb8f
--- /dev/null
+++ b/tests/api/auth/login.test.ts
@@ -0,0 +1,65 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { POST } from "@/src/app/api/auth/login/route";
+
+vi.mock("@/src/lib/supabase/server", () => ({
+  createClient: vi.fn(),
+}));
+
+import { createClient } from "@/src/lib/supabase/server";
+
+const mockSignInWithPassword = vi.fn();
+const mockSupabase = { auth: { signInWithPassword: mockSignInWithPassword } };
+
+beforeEach(() => {
+  vi.mocked(createClient).mockResolvedValue(mockSupabase as never);
+  mockSignInWithPassword.mockReset();
+});
+
+function makeRequest(body: Record<string, unknown>) {
+  return new Request("http://localhost/api/auth/login", {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify(body),
+  });
+}
+
+describe("POST /api/auth/login", () => {
+  it("gibt 400 zurück wenn E-Mail fehlt", async () => {
+    const res = await POST(makeRequest({ password: "passwort123" }));
+    expect(res.status).toBe(400);
+    const data = await res.json();
+    expect(data.error).toBeDefined();
+  });
+
+  it("gibt 400 zurück wenn Passwort fehlt", async () => {
+    const res = await POST(makeRequest({ email: "test@example.com" }));
+    expect(res.status).toBe(400);
+  });
+
+  it("gibt 401 zurück bei falschen Credentials", async () => {
+    mockSignInWithPassword.mockResolvedValue({
+      data: { user: null, session: null },
+      error: { message: "Invalid login credentials" },
+    });
+
+    const res = await POST(makeRequest({ email: "test@example.com", password: "falsch123" }));
+    expect(res.status).toBe(401);
+    const data = await res.json();
+    expect(data.error).toContain("falsch");
+  });
+
+  it("gibt 200 und User/Session zurück bei Erfolg", async () => {
+    const fakeUser = { id: "user-1", email: "test@example.com" };
+    const fakeSession = { access_token: "token-abc" };
+    mockSignInWithPassword.mockResolvedValue({
+      data: { user: fakeUser, session: fakeSession },
+      error: null,
+    });
+
+    const res = await POST(makeRequest({ email: "test@example.com", password: "Richtig!123" }));
+    expect(res.status).toBe(200);
+    const data = await res.json();
+    expect(data.user.id).toBe("user-1");
+    expect(data.session.access_token).toBe("token-abc");
+  });
+});
diff --git a/tests/api/auth/register-employee.test.ts b/tests/api/auth/register-employee.test.ts
new file mode 100644
index 0000000..f102610
--- /dev/null
+++ b/tests/api/auth/register-employee.test.ts
@@ -0,0 +1,124 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { POST } from "@/src/app/api/auth/register/employee/route";
+
+vi.mock("@/src/lib/supabase/server", () => ({
+  createClient: vi.fn(),
+}));
+
+vi.mock("@/src/lib/prisma", () => ({
+  prisma: {
+    employee: { findUnique: vi.fn() },
+  },
+}));
+
+import { createClient } from "@/src/lib/supabase/server";
+import { prisma } from "@/src/lib/prisma";
+
+const mockSignUp = vi.fn();
+const mockSupabase = { auth: { signUp: mockSignUp } };
+
+const validToken = "valid-token-abc";
+const validEmployee = {
+  email: "employee@example.com",
+  isOnboarded: false,
+  onboardingTokenExpiry: new Date(Date.now() + 3600000),
+};
+
+beforeEach(() => {
+  vi.mocked(createClient).mockResolvedValue(mockSupabase as never);
+  vi.mocked(prisma.employee.findUnique).mockReset();
+  mockSignUp.mockReset();
+});
+
+const validBody = {
+  token: validToken,
+  email: "employee@example.com",
+  password: "Sicher!123",
+  firstName: "Anna",
+  lastName: "Schmidt",
+};
+
+let ipCounter = 0;
+
+function makeRequest(body: Record<string, unknown>) {
+  // Each test gets a unique IP to avoid triggering the in-memory rate limiter
+  const ip = `10.0.0.${++ipCounter}`;
+  return new Request("http://localhost/api/auth/register/employee", {
+    method: "POST",
+    headers: {
+      "Content-Type": "application/json",
+      "x-forwarded-for": ip,
+    },
+    body: JSON.stringify(body),
+  });
+}
+
+describe("POST /api/auth/register/employee", () => {
+  it("gibt 400 zurück wenn Pflichtfelder fehlen", async () => {
+    const res = await POST(makeRequest({ token: validToken }));
+    expect(res.status).toBe(400);
+  });
+
+  it("gibt 401 zurück bei ungültigem Token", async () => {
+    vi.mocked(prisma.employee.findUnique).mockResolvedValue(null);
+
+    const res = await POST(makeRequest(validBody));
+    expect(res.status).toBe(401);
+    const data = await res.json();
+    expect(data.error).toContain("Ungültiger Token");
+  });
+
+  it("gibt 401 zurück bei bereits abgeschlossenem Onboarding", async () => {
+    vi.mocked(prisma.employee.findUnique).mockResolvedValue({
+      ...validEmployee,
+      isOnboarded: true,
+    } as never);
+
+    const res = await POST(makeRequest(validBody));
+    expect(res.status).toBe(401);
+  });
+
+  it("gibt 401 zurück bei falschem E-Mail im Token", async () => {
+    vi.mocked(prisma.employee.findUnique).mockResolvedValue({
+      ...validEmployee,
+      email: "andere@example.com",
+    } as never);
+
+    const res = await POST(makeRequest(validBody));
+    expect(res.status).toBe(401);
+  });
+
+  it("gibt 401 zurück bei abgelaufenem Token", async () => {
+    vi.mocked(prisma.employee.findUnique).mockResolvedValue({
+      ...validEmployee,
+      onboardingTokenExpiry: new Date(Date.now() - 1000),
+    } as never);
+
+    const res = await POST(makeRequest(validBody));
+    expect(res.status).toBe(401);
+    const data = await res.json();
+    expect(data.error).toContain("abgelaufen");
+  });
+
+  it("gibt 400 zurück bei schwachem Passwort", async () => {
+    vi.mocked(prisma.employee.findUnique).mockResolvedValue(validEmployee as never);
+
+    const res = await POST(makeRequest({ ...validBody, password: "schwach" }));
+    expect(res.status).toBe(400);
+    const data = await res.json();
+    expect(data.error).toContain("Passwort");
+  });
+
+  it("gibt 201 zurück bei erfolgreicher Registrierung", async () => {
+    vi.mocked(prisma.employee.findUnique).mockResolvedValue(validEmployee as never);
+    mockSignUp.mockResolvedValue({
+      data: { user: { id: "emp-1" } },
+      error: null,
+    });
+
+    const res = await POST(makeRequest(validBody));
+    expect(res.status).toBe(201);
+    const data = await res.json();
+    expect(data.success).toBe(true);
+  });
+});
diff --git a/tests/api/auth/register.test.ts b/tests/api/auth/register.test.ts
new file mode 100644
index 0000000..85e638a
--- /dev/null
+++ b/tests/api/auth/register.test.ts
@@ -0,0 +1,106 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { POST } from "@/src/app/api/auth/register/route";
+
+vi.mock("@/src/lib/supabase/server", () => ({
+  createClient: vi.fn(),
+}));
+
+vi.mock("@/src/lib/prisma", () => ({
+  prisma: {
+    manager: { findUnique: vi.fn() },
+    user: { findUnique: vi.fn(), create: vi.fn() },
+  },
+}));
+
+import { createClient } from "@/src/lib/supabase/server";
+import { prisma } from "@/src/lib/prisma";
+
+const mockSignUp = vi.fn();
+const mockSupabase = { auth: { signUp: mockSignUp } };
+
+beforeEach(() => {
+  vi.mocked(createClient).mockResolvedValue(mockSupabase as never);
+  vi.mocked(prisma.manager.findUnique).mockReset();
+  vi.mocked(prisma.user.findUnique).mockReset();
+  vi.mocked(prisma.user.create).mockReset();
+  mockSignUp.mockReset();
+});
+
+const validBody = {
+  email: "neu@example.com",
+  password: "Sicher!123",
+  name: "Max Mustermann",
+  birthday: "1990-05-15",
+  plz: "10115",
+  city: "Berlin",
+  street: "Musterstraße 1",
+  houseNumber: "1",
+  gender: "Men",
+};
+
+function makeRequest(body: Record<string, unknown>) {
+  return new Request("http://localhost/api/auth/register", {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify(body),
+  });
+}
+
+describe("POST /api/auth/register", () => {
+  it("gibt 400 zurück wenn Pflichtfelder fehlen", async () => {
+    const res = await POST(makeRequest({ email: "test@example.com" }));
+    expect(res.status).toBe(400);
+  });
+
+  it("gibt 409 zurück wenn E-Mail bereits als Manager existiert", async () => {
+    vi.mocked(prisma.manager.findUnique).mockResolvedValue({
+      id: "m-1",
+      email: validBody.email,
+    } as never);
+
+    const res = await POST(makeRequest(validBody));
+    expect(res.status).toBe(409);
+    const data = await res.json();
+    expect(data.error).toContain("Manager");
+  });
+
+  it("gibt 409 zurück wenn User bereits existiert", async () => {
+    vi.mocked(prisma.manager.findUnique).mockResolvedValue(null);
+    vi.mocked(prisma.user.findUnique).mockResolvedValue({
+      id: "u-1",
+      email: validBody.email,
+    } as never);
+
+    const res = await POST(makeRequest(validBody));
+    expect(res.status).toBe(409);
+    const data = await res.json();
+    expect(data.error).toContain("existiert bereits");
+  });
+
+  it("gibt 400 zurück bei Supabase-Auth-Fehler", async () => {
+    vi.mocked(prisma.manager.findUnique).mockResolvedValue(null);
+    vi.mocked(prisma.user.findUnique).mockResolvedValue(null);
+    mockSignUp.mockResolvedValue({
+      data: { user: null },
+      error: { message: "Email rate limit exceeded" },
+    });
+
+    const res = await POST(makeRequest(validBody));
+    expect(res.status).toBe(400);
+  });
+
+  it("gibt 201 und neuen User zurück bei Erfolg", async () => {
+    const fakeUser = { id: "new-1" };
+    const createdUser = { id: "new-1", email: validBody.email, name: validBody.name };
+
+    vi.mocked(prisma.manager.findUnique).mockResolvedValue(null);
+    vi.mocked(prisma.user.findUnique).mockResolvedValue(null);
+    mockSignUp.mockResolvedValue({ data: { user: fakeUser }, error: null });
+    vi.mocked(prisma.user.create).mockResolvedValue(createdUser as never);
+
+    const res = await POST(makeRequest(validBody));
+    expect(res.status).toBe(201);
+    const data = await res.json();
+    expect(data.user.email).toBe(validBody.email);
+  });
+});
diff --git a/tests/api/upload/avatar.test.ts b/tests/api/upload/avatar.test.ts
new file mode 100644
index 0000000..9eb4cae
--- /dev/null
+++ b/tests/api/upload/avatar.test.ts
@@ -0,0 +1,136 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { POST } from "@/src/app/api/upload/avatar/route";
+
+vi.mock("@/src/lib/supabase/admin", () => ({
+  createAdminClient: vi.fn(),
+}));
+
+vi.mock("@/src/lib/prisma", () => ({
+  prisma: {
+    employee: { findUnique: vi.fn() },
+  },
+}));
+
+import { createAdminClient } from "@/src/lib/supabase/admin";
+import { prisma } from "@/src/lib/prisma";
+
+const mockUpload = vi.fn();
+const mockGetPublicUrl = vi.fn().mockReturnValue({
+  data: { publicUrl: "https://example.com/avatars/emp-1/photo.jpg" },
+});
+const mockStorageBucket = { upload: mockUpload, getPublicUrl: mockGetPublicUrl };
+const mockAdminClient = { storage: { from: vi.fn().mockReturnValue(mockStorageBucket) } };
+
+const validEmployee = {
+  id: "emp-1",
+  isOnboarded: false,
+  onboardingTokenExpiry: new Date(Date.now() + 3600000),
+};
+
+beforeEach(() => {
+  vi.mocked(createAdminClient).mockReturnValue(mockAdminClient as never);
+  vi.mocked(prisma.employee.findUnique).mockReset();
+  mockUpload.mockReset();
+  mockUpload.mockResolvedValue({ data: { path: "employees/emp-1/photo.jpg" }, error: null });
+});
+
+function makeImageFile(name = "photo.jpg", type = "image/jpeg", sizeBytes = 1024): File {
+  const content = new Uint8Array(sizeBytes);
+  const file = new File([content], name, { type });
+  // Ensure arrayBuffer() is available (jsdom File may lack it in Node.js test env)
+  if (typeof file.arrayBuffer !== "function") {
+    Object.defineProperty(file, "arrayBuffer", {
+      value: async () => content.buffer,
+    });
+  }
+  return file;
+}
+
+// jsdom's multipart body parser drops File.type, so we mock formData() directly
+// to return a FormData containing the original File object unchanged.
+function makeRequest(file: File | null, token: string | null): Request {
+  const req = new Request("http://localhost/api/upload/avatar", { method: "POST" });
+
+  req.formData = async () => {
+    const fd = {
+      get(key: string) {
+        if (key === "file") return file;
+        if (key === "token") return token;
+        return null;
+      },
+    } as unknown as FormData;
+    return fd;
+  };
+
+  return req;
+}
+
+describe("POST /api/upload/avatar", () => {
+  it("gibt 400 zurück wenn Datei fehlt", async () => {
+    const res = await POST(makeRequest(null, "valid-token"));
+    expect(res.status).toBe(400);
+    const data = await res.json();
+    expect(data.error).toContain("Token");
+  });
+
+  it("gibt 400 zurück wenn Token fehlt", async () => {
+    const res = await POST(makeRequest(makeImageFile(), null));
+    expect(res.status).toBe(400);
+  });
+
+  it("gibt 401 zurück bei ungültigem Token", async () => {
+    vi.mocked(prisma.employee.findUnique).mockResolvedValue(null);
+
+    const res = await POST(makeRequest(makeImageFile(), "invalid-token"));
+    expect(res.status).toBe(401);
+  });
+
+  it("gibt 401 zurück bei bereits abgeschlossenem Onboarding", async () => {
+    vi.mocked(prisma.employee.findUnique).mockResolvedValue({
+      ...validEmployee,
+      isOnboarded: true,
+    } as never);
+
+    const res = await POST(makeRequest(makeImageFile(), "valid-token"));
+    expect(res.status).toBe(401);
+  });
+
+  it("gibt 401 zurück bei abgelaufenem Token", async () => {
+    vi.mocked(prisma.employee.findUnique).mockResolvedValue({
+      ...validEmployee,
+      onboardingTokenExpiry: new Date(Date.now() - 1000),
+    } as never);
+
+    const res = await POST(makeRequest(makeImageFile(), "valid-token"));
+    expect(res.status).toBe(401);
+  });
+
+  it("gibt 400 zurück bei nicht-Bilddatei", async () => {
+    vi.mocked(prisma.employee.findUnique).mockResolvedValue(validEmployee as never);
+
+    const pdfFile = new File(["pdf content"], "doc.pdf", { type: "application/pdf" });
+    const res = await POST(makeRequest(pdfFile, "valid-token"));
+    expect(res.status).toBe(400);
+    const data = await res.json();
+    expect(data.error).toContain("Bilddateien");
+  });
+
+  it("gibt 400 zurück bei zu großer Datei (>5MB)", async () => {
+    vi.mocked(prisma.employee.findUnique).mockResolvedValue(validEmployee as never);
+
+    const bigFile = makeImageFile("big.jpg", "image/jpeg", 6 * 1024 * 1024);
+    const res = await POST(makeRequest(bigFile, "valid-token"));
+    expect(res.status).toBe(400);
+    const data = await res.json();
+    expect(data.error).toContain("5MB");
+  });
+
+  it("gibt 201 und publicUrl zurück bei Erfolg", async () => {
+    vi.mocked(prisma.employee.findUnique).mockResolvedValue(validEmployee as never);
+
+    const res = await POST(makeRequest(makeImageFile(), "valid-token"));
+    expect(res.status).toBe(201);
+    const data = await res.json();
+    expect(data.publicUrl).toContain("https://");
+  });
+});
diff --git a/tests/hooks/useAuth.test.ts b/tests/hooks/useAuth.test.ts
new file mode 100644
index 0000000..f8cac3d
--- /dev/null
+++ b/tests/hooks/useAuth.test.ts
@@ -0,0 +1,163 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { renderHook, act } from "@testing-library/react";
+
+vi.mock("next/navigation", () => ({
+  useRouter: () => ({ push: mockRouterPush }),
+}));
+
+vi.mock("@/src/store/authStore", () => ({
+  useAuthStore: (selector: (s: { setUser: typeof mockSetUser }) => typeof mockSetUser) =>
+    selector({ setUser: mockSetUser }),
+}));
+
+vi.mock("@/src/lib/supabase/client", () => ({
+  createClient: () => ({ auth: { signInWithPassword: mockSupabaseSignIn } }),
+}));
+
+vi.mock("sonner", () => ({
+  toast: { success: vi.fn(), error: vi.fn() },
+}));
+
+const mockRouterPush = vi.fn();
+const mockSetUser = vi.fn();
+const mockSupabaseSignIn = vi.fn();
+
+import { useAuth } from "@/src/hooks/useAuth";
+
+beforeEach(() => {
+  mockRouterPush.mockReset();
+  mockSetUser.mockReset();
+  mockSupabaseSignIn.mockReset();
+  vi.stubGlobal("fetch", vi.fn());
+});
+
+describe("useAuth", () => {
+  describe("loginUser", () => {
+    it("gibt Zod-Validierungsfehler bei ungültiger E-Mail zurück", async () => {
+      const { result } = renderHook(() => useAuth());
+
+      let success: boolean;
+      await act(async () => {
+        success = await result.current.loginUser("keine-email", "passwort123", false);
+      });
+
+      expect(success!).toBe(false);
+      expect(result.current.errors.email).toBeDefined();
+      expect(mockSupabaseSignIn).not.toHaveBeenCalled();
+    });
+
+    it("setzt Fehler bei falschen Credentials", async () => {
+      mockSupabaseSignIn.mockResolvedValue({
+        data: { user: null, session: null },
+        error: { message: "Invalid credentials" },
+      });
+
+      const { result } = renderHook(() => useAuth());
+
+      let success: boolean;
+      await act(async () => {
+        success = await result.current.loginUser("test@example.com", "Falsch!123", false);
+      });
+
+      expect(success!).toBe(false);
+      expect(result.current.errors.email).toBeDefined();
+      expect(mockRouterPush).not.toHaveBeenCalled();
+    });
+
+    it("ruft setUser und router.push bei erfolgreichem Login auf", async () => {
+      const fakeUser = { id: "user-1", email: "test@example.com" };
+      mockSupabaseSignIn.mockResolvedValue({
+        data: { user: fakeUser, session: {} },
+        error: null,
+      });
+
+      const { result } = renderHook(() => useAuth());
+
+      let success: boolean;
+      await act(async () => {
+        success = await result.current.loginUser("test@example.com", "Richtig!123", false);
+      });
+
+      expect(success!).toBe(true);
+      expect(mockSetUser).toHaveBeenCalledWith(fakeUser);
+      expect(mockRouterPush).toHaveBeenCalledWith("/dashboard");
+    });
+
+    it("setzt loading auf false nach Abschluss", async () => {
+      mockSupabaseSignIn.mockResolvedValue({
+        data: { user: { id: "1" }, session: {} },
+        error: null,
+      });
+
+      const { result } = renderHook(() => useAuth());
+
+      await act(async () => {
+        await result.current.loginUser("test@example.com", "Richtig!123", false);
+      });
+
+      expect(result.current.loading).toBe(false);
+    });
+  });
+
+  describe("registerUser", () => {
+    const validFormData = {
+      fullName: "Max Mustermann",
+      email: "max@example.com",
+      password: "Sicher!123",
+      passwordConfirm: "Sicher!123",
+      birthday: "1990-05-15",
+      plz: "10115",
+      place: "Berlin",
+      street: "Musterstr. 1",
+      gender: "Men" as const,
+    };
+
+    it("gibt Zod-Fehler bei fehlenden Pflichtfeldern zurück", async () => {
+      const { result } = renderHook(() => useAuth());
+
+      let success: boolean;
+      await act(async () => {
+        success = await result.current.registerUser({
+          ...validFormData,
+          email: "keine-email",
+        });
+      });
+
+      expect(success!).toBe(false);
+      expect(result.current.errors.email).toBeDefined();
+    });
+
+    it("gibt true bei erfolgreicher Registrierung zurück", async () => {
+      vi.mocked(fetch).mockResolvedValue({
+        ok: true,
+        json: async () => ({ user: { id: "new-1" } }),
+      } as Response);
+
+      const { result } = renderHook(() => useAuth());
+
+      let success: boolean;
+      await act(async () => {
+        success = await result.current.registerUser(validFormData);
+      });
+
+      expect(success!).toBe(true);
+    });
+
+    it("setzt Fehler bei API-Fehlerantwort", async () => {
+      vi.mocked(fetch).mockResolvedValue({
+        ok: false,
+        json: async () => ({ error: "Dieser Nutzer existiert bereits." }),
+      } as Response);
+
+      const { result } = renderHook(() => useAuth());
+
+      let success: boolean;
+      await act(async () => {
+        success = await result.current.registerUser(validFormData);
+      });
+
+      expect(success!).toBe(false);
+      expect(result.current.errors.email).toContain("existiert bereits");
+    });
+  });
+});
diff --git a/tests/hooks/useImageUpload.test.ts b/tests/hooks/useImageUpload.test.ts
new file mode 100644
index 0000000..b2bd47e
--- /dev/null
+++ b/tests/hooks/useImageUpload.test.ts
@@ -0,0 +1,127 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { renderHook, act } from "@testing-library/react";
+import { useImageUpload } from "@/src/hooks/useImageUpload";
+
+vi.mock("@/src/lib/supabase/storage", () => ({
+  uploadFile: vi.fn(),
+  deleteFile: vi.fn(),
+  generateFilePath: vi.fn().mockReturnValue("users/user-1/1234567890.jpg"),
+}));
+
+import { uploadFile, deleteFile } from "@/src/lib/supabase/storage";
+
+const defaultOptions = { bucket: "avatars" as const };
+
+function makeFile(name = "photo.jpg", type = "image/jpeg", sizeBytes = 1024): File {
+  return new File([new Uint8Array(sizeBytes)], name, { type });
+}
+
+beforeEach(() => {
+  vi.mocked(uploadFile).mockReset();
+  vi.mocked(deleteFile).mockReset();
+});
+
+describe("useImageUpload", () => {
+  it("gibt initialen State zurück", () => {
+    const { result } = renderHook(() => useImageUpload(defaultOptions));
+    expect(result.current.isUploading).toBe(false);
+    expect(result.current.error).toBeNull();
+    expect(result.current.progress).toBe(0);
+  });
+
+  it("lehnt ungültigen MIME-Type ab und setzt error", async () => {
+    const { result } = renderHook(() => useImageUpload(defaultOptions));
+    const pdfFile = new File(["pdf"], "doc.pdf", { type: "application/pdf" });
+
+    await act(async () => {
+      await expect(result.current.upload(pdfFile, "user-1")).rejects.toThrow();
+    });
+
+    expect(result.current.error).toContain("Ungültiger Dateityp");
+    expect(result.current.isUploading).toBe(false);
+  });
+
+  it("lehnt Datei über maximaler Größe ab und setzt error", async () => {
+    const { result } = renderHook(() => useImageUpload({ ...defaultOptions, maxSizeMB: 1 }));
+    const bigFile = makeFile("big.jpg", "image/jpeg", 2 * 1024 * 1024);
+
+    await act(async () => {
+      await expect(result.current.upload(bigFile, "user-1")).rejects.toThrow();
+    });
+
+    expect(result.current.error).toContain("groß");
+    expect(result.current.isUploading).toBe(false);
+  });
+
+  it("setzt isUploading auf false nach erfolgreichem Upload", async () => {
+    vi.mocked(uploadFile).mockResolvedValue({
+      path: "users/user-1/photo.jpg",
+      publicUrl: "https://example.com/photo.jpg",
+    });
+
+    const { result } = renderHook(() => useImageUpload(defaultOptions));
+    const file = makeFile();
+
+    let url: string;
+    await act(async () => {
+      url = await result.current.upload(file, "user-1");
+    });
+
+    expect(url!).toBe("https://example.com/photo.jpg");
+    expect(result.current.isUploading).toBe(false);
+    expect(result.current.error).toBeNull();
+    expect(result.current.progress).toBe(100);
+  });
+
+  it("setzt error bei fehlgeschlagenem Upload", async () => {
+    vi.mocked(uploadFile).mockRejectedValue(new Error("Netzwerkfehler"));
+
+    const { result } = renderHook(() => useImageUpload(defaultOptions));
+
+    await act(async () => {
+      await expect(result.current.upload(makeFile(), "user-1")).rejects.toThrow("Netzwerkfehler");
+    });
+
+    expect(result.current.error).toBe("Netzwerkfehler");
+    expect(result.current.isUploading).toBe(false);
+  });
+
+  it("ruft deleteFile mit korrektem Pfad auf", async () => {
+    vi.mocked(deleteFile).mockResolvedValue(undefined);
+
+    const { result } = renderHook(() => useImageUpload(defaultOptions));
+
+    await act(async () => {
+      await result.current.remove("users/user-1/old-photo.jpg");
+    });
+
+    expect(deleteFile).toHaveBeenCalledWith("avatars", "users/user-1/old-photo.jpg");
+    expect(result.current.error).toBeNull();
+  });
+
+  it("setzt error wenn delete fehlschlägt", async () => {
+    vi.mocked(deleteFile).mockRejectedValue(new Error("Löschen fehlgeschlagen"));
+
+    const { result } = renderHook(() => useImageUpload(defaultOptions));
+
+    await act(async () => {
+      await expect(result.current.remove("some/path.jpg")).rejects.toThrow();
+    });
+
+    expect(result.current.error).toBe("Löschen fehlgeschlagen");
+  });
+
+  it("akzeptiert konfigurierbare erlaubte MIME-Types", async () => {
+    const { result } = renderHook(() =>
+      useImageUpload({ ...defaultOptions, allowedTypes: ["image/png"] })
+    );
+
+    const jpegFile = makeFile("photo.jpg", "image/jpeg");
+
+    await act(async () => {
+      await expect(result.current.upload(jpegFile, "user-1")).rejects.toThrow();
+    });
+
+    expect(result.current.error).toContain("Ungültiger Dateityp");
+  });
+});
diff --git a/tests/hooks/useIsMobile.test.ts b/tests/hooks/useIsMobile.test.ts
new file mode 100644
index 0000000..a8b52d2
--- /dev/null
+++ b/tests/hooks/useIsMobile.test.ts
@@ -0,0 +1,71 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
+import { renderHook, act } from "@testing-library/react";
+import { useIsMobile } from "@/src/hooks/use-mobile";
+
+const mockAddEventListener = vi.fn();
+const mockRemoveEventListener = vi.fn();
+
+function setWindowWidth(width: number) {
+  Object.defineProperty(window, "innerWidth", {
+    writable: true,
+    configurable: true,
+    value: width,
+  });
+
+  Object.defineProperty(window, "matchMedia", {
+    writable: true,
+    configurable: true,
+    value: (query: string) => ({
+      matches: width < 768,
+      media: query,
+      onchange: null,
+      addListener: vi.fn(),
+      removeListener: vi.fn(),
+      addEventListener: mockAddEventListener,
+      removeEventListener: mockRemoveEventListener,
+      dispatchEvent: vi.fn(),
+    }),
+  });
+}
+
+beforeEach(() => {
+  mockAddEventListener.mockClear();
+  mockRemoveEventListener.mockClear();
+});
+
+afterEach(() => {
+  vi.restoreAllMocks();
+});
+
+describe("useIsMobile", () => {
+  it("gibt true zurück bei schmaler Viewport-Breite (<768px)", () => {
+    setWindowWidth(500);
+    const { result } = renderHook(() => useIsMobile());
+    expect(result.current).toBe(true);
+  });
+
+  it("gibt false zurück bei breiter Viewport-Breite (>=768px)", () => {
+    setWindowWidth(1024);
+    const { result } = renderHook(() => useIsMobile());
+    expect(result.current).toBe(false);
+  });
+
+  it("gibt false zurück genau bei 768px", () => {
+    setWindowWidth(768);
+    const { result } = renderHook(() => useIsMobile());
+    expect(result.current).toBe(false);
+  });
+
+  it("registriert einen Event-Listener auf matchMedia", () => {
+    setWindowWidth(500);
+    renderHook(() => useIsMobile());
+    expect(mockAddEventListener).toHaveBeenCalledWith("change", expect.any(Function));
+  });
+
+  it("entfernt den Event-Listener beim Unmount", () => {
+    setWindowWidth(500);
+    const { unmount } = renderHook(() => useIsMobile());
+    unmount();
+    expect(mockRemoveEventListener).toHaveBeenCalledWith("change", expect.any(Function));
+  });
+});
diff --git a/tests/msw/handlers.ts b/tests/msw/handlers.ts
new file mode 100644
index 0000000..0d94207
--- /dev/null
+++ b/tests/msw/handlers.ts
@@ -0,0 +1,77 @@
+import { http, HttpResponse } from "msw";
+
+export const handlers = [
+  http.post("http://localhost/api/auth/login", async ({ request }) => {
+    const body = (await request.json()) as Record<string, unknown>;
+
+    if (!body.email || !body.password) {
+      return HttpResponse.json({ error: "E-Mail und Passwort sind erforderlich" }, { status: 400 });
+    }
+
+    if (body.email === "wrong@example.com") {
+      return HttpResponse.json({ error: "E-Mail oder Passwort ist falsch" }, { status: 401 });
+    }
+
+    return HttpResponse.json(
+      {
+        user: { id: "user-1", email: body.email },
+        session: { access_token: "token-123" },
+      },
+      { status: 200 }
+    );
+  }),
+
+  http.post("http://localhost/api/auth/register", async ({ request }) => {
+    const body = (await request.json()) as Record<string, unknown>;
+
+    if (!body.email || !body.password || !body.name) {
+      return HttpResponse.json({ error: "Pflichtfelder fehlen" }, { status: 400 });
+    }
+
+    if (body.email === "existing@example.com") {
+      return HttpResponse.json({ error: "Dieser Nutzer existiert bereits." }, { status: 409 });
+    }
+
+    return HttpResponse.json(
+      { user: { id: "new-user-1", email: body.email, name: body.name } },
+      { status: 201 }
+    );
+  }),
+
+  http.post("http://localhost/api/auth/register/employee", async ({ request }) => {
+    const body = (await request.json()) as Record<string, unknown>;
+
+    if (!body.token || !body.email || !body.password || !body.firstName || !body.lastName) {
+      return HttpResponse.json({ error: "Pflichtfelder fehlen" }, { status: 400 });
+    }
+
+    if (body.token === "expired-token") {
+      return HttpResponse.json({ error: "Token abgelaufen" }, { status: 401 });
+    }
+
+    if (body.token === "invalid-token") {
+      return HttpResponse.json({ error: "Ungültiger Token" }, { status: 401 });
+    }
+
+    return HttpResponse.json({ success: true }, { status: 201 });
+  }),
+
+  http.post("http://localhost/api/upload/avatar", async ({ request }) => {
+    const formData = await request.formData();
+    const file = formData.get("file");
+    const token = formData.get("token");
+
+    if (!file || !token) {
+      return HttpResponse.json({ error: "Datei und Token erforderlich" }, { status: 400 });
+    }
+
+    if (token === "invalid-token") {
+      return HttpResponse.json({ error: "Ungültiger Token" }, { status: 401 });
+    }
+
+    return HttpResponse.json(
+      { publicUrl: "https://example.com/avatars/employee-1/avatar.jpg" },
+      { status: 201 }
+    );
+  }),
+];
diff --git a/tests/msw/server.ts b/tests/msw/server.ts
new file mode 100644
index 0000000..7b37f2a
--- /dev/null
+++ b/tests/msw/server.ts
@@ -0,0 +1,4 @@
+import { setupServer } from "msw/node";
+import { handlers } from "./handlers";
+
+export const server = setupServer(...handlers);
diff --git a/tests/schemas/courseSchema.test.ts b/tests/schemas/courseSchema.test.ts
new file mode 100644
index 0000000..64039f6
--- /dev/null
+++ b/tests/schemas/courseSchema.test.ts
@@ -0,0 +1,155 @@
+import { describe, it, expect } from "vitest";
+import { courseSchema, publishedCourseSchema } from "@/src/modules/courses/schemas/course-schema";
+
+describe("courseSchema (Draft)", () => {
+  it("akzeptiert komplett leere Daten (Entwurf)", () => {
+    const result = courseSchema.safeParse({ isStandingOrder: false });
+    expect(result.success).toBe(true);
+  });
+
+  it("akzeptiert leere String-Felder", () => {
+    const result = courseSchema.safeParse({
+      name: "",
+      date: "",
+      timeFrom: "",
+      timeTo: "",
+      isStandingOrder: false,
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it("lehnt timeFrom >= timeTo ab", () => {
+    const result = courseSchema.safeParse({
+      isStandingOrder: false,
+      timeFrom: "14:00",
+      timeTo: "10:00",
+    });
+    expect(result.success).toBe(false);
+    expect(result.error?.issues[0].path[0]).toBe("timeTo");
+  });
+
+  it("akzeptiert valide Zeitspanne", () => {
+    const result = courseSchema.safeParse({
+      isStandingOrder: false,
+      timeFrom: "09:00",
+      timeTo: "10:30",
+    });
+    expect(result.success).toBe(true);
+  });
+});
+
+const validPublishedCourse = {
+  name: "Yoga Grundlagen",
+  sport: ["Yoga"],
+  level: "Anfänger",
+  date: "2026-05-01",
+  timeFrom: "09:00",
+  timeTo: "10:30",
+  trainers: ["trainer-1"],
+  room: "raum-1",
+  description: "Einführungskurs",
+  maxParticipants: 15,
+  price: 19.99,
+  isStandingOrder: false,
+};
+
+describe("publishedCourseSchema", () => {
+  it("akzeptiert vollständig valide Kursdaten", () => {
+    const result = publishedCourseSchema.safeParse(validPublishedCourse);
+    expect(result.success).toBe(true);
+  });
+
+  it("lehnt fehlenden Kursnamen ab", () => {
+    const result = publishedCourseSchema.safeParse({ ...validPublishedCourse, name: "" });
+    expect(result.success).toBe(false);
+    expect(result.error?.issues[0].path[0]).toBe("name");
+  });
+
+  it("lehnt leeres Sport-Array ab", () => {
+    const result = publishedCourseSchema.safeParse({ ...validPublishedCourse, sport: [] });
+    expect(result.success).toBe(false);
+    expect(result.error?.issues[0].path[0]).toBe("sport");
+  });
+
+  it("lehnt leeres Trainer-Array ab", () => {
+    const result = publishedCourseSchema.safeParse({ ...validPublishedCourse, trainers: [] });
+    expect(result.success).toBe(false);
+    expect(result.error?.issues[0].path[0]).toBe("trainers");
+  });
+
+  it("lehnt maxParticipants über 100 ab", () => {
+    const result = publishedCourseSchema.safeParse({
+      ...validPublishedCourse,
+      maxParticipants: 101,
+    });
+    expect(result.success).toBe(false);
+    expect(result.error?.issues[0].path[0]).toBe("maxParticipants");
+  });
+
+  it("lehnt maxParticipants unter 1 ab", () => {
+    const result = publishedCourseSchema.safeParse({ ...validPublishedCourse, maxParticipants: 0 });
+    expect(result.success).toBe(false);
+    expect(result.error?.issues[0].path[0]).toBe("maxParticipants");
+  });
+
+  it("lehnt Preis über 9999.99 ab", () => {
+    const result = publishedCourseSchema.safeParse({ ...validPublishedCourse, price: 10000 });
+    expect(result.success).toBe(false);
+    expect(result.error?.issues[0].path[0]).toBe("price");
+  });
+
+  it("lehnt negativen Preis ab", () => {
+    const result = publishedCourseSchema.safeParse({ ...validPublishedCourse, price: -1 });
+    expect(result.success).toBe(false);
+    expect(result.error?.issues[0].path[0]).toBe("price");
+  });
+
+  it("lehnt timeFrom >= timeTo ab", () => {
+    const result = publishedCourseSchema.safeParse({
+      ...validPublishedCourse,
+      timeFrom: "11:00",
+      timeTo: "09:00",
+    });
+    expect(result.success).toBe(false);
+    expect(result.error?.issues[0].path[0]).toBe("timeTo");
+  });
+
+  it("lehnt Dauerauftrag ohne Häufigkeit ab", () => {
+    const result = publishedCourseSchema.safeParse({
+      ...validPublishedCourse,
+      isStandingOrder: true,
+    });
+    expect(result.success).toBe(false);
+    expect(result.error?.issues[0].path[0]).toBe("frequency");
+  });
+
+  it("akzeptiert Dauerauftrag mit Häufigkeit", () => {
+    const result = publishedCourseSchema.safeParse({
+      ...validPublishedCourse,
+      isStandingOrder: true,
+      frequency: "weekly",
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it("lehnt individuelle Häufigkeit ohne Wochentage ab", () => {
+    const result = publishedCourseSchema.safeParse({
+      ...validPublishedCourse,
+      isStandingOrder: true,
+      frequency: "custom",
+      weekdays: [],
+    });
+    expect(result.success).toBe(false);
+    expect(result.error?.issues[0].path[0]).toBe("weekdays");
+  });
+
+  it("akzeptiert individuelle Häufigkeit mit Wochentagen", () => {
+    const result = publishedCourseSchema.safeParse({
+      ...validPublishedCourse,
+      isStandingOrder: true,
+      frequency: "custom",
+      weekdays: ["Montag", "Mittwoch"],
+    });
+    expect(result.success).toBe(true);
+  });
+});
diff --git a/tests/schemas/employeeSchema.test.ts b/tests/schemas/employeeSchema.test.ts
new file mode 100644
index 0000000..9ecd7f5
--- /dev/null
+++ b/tests/schemas/employeeSchema.test.ts
@@ -0,0 +1,71 @@
+import { describe, it, expect } from "vitest";
+import { employeeSchema } from "@/src/modules/employee/schemas/employee-schema";
+
+const defaultPermissions = {
+  employees: { view: true, create: false, edit: false, delete: false },
+  courses: { view: true, create: false, edit: false, delete: false },
+  rooms: { view: true, create: false, edit: false, delete: false },
+};
+
+const validData = {
+  email: "mitarbeiter@example.com",
+  roles: ["Trainer"],
+  isMultipleLocation: false,
+  permissions: defaultPermissions,
+};
+
+describe("employeeSchema", () => {
+  it("akzeptiert valide Mitarbeiterdaten", () => {
+    const result = employeeSchema.safeParse(validData);
+    expect(result.success).toBe(true);
+  });
+
+  it("lehnt ungültige E-Mail ab", () => {
+    const result = employeeSchema.safeParse({ ...validData, email: "keine-email" });
+    expect(result.success).toBe(false);
+    expect(result.error?.issues[0].path[0]).toBe("email");
+  });
+
+  it("lehnt leeres Rollen-Array ab", () => {
+    const result = employeeSchema.safeParse({ ...validData, roles: [] });
+    expect(result.success).toBe(false);
+    expect(result.error?.issues[0].path[0]).toBe("roles");
+  });
+
+  it("lehnt mehrere Standorte ohne Standort-Auswahl ab", () => {
+    const result = employeeSchema.safeParse({
+      ...validData,
+      isMultipleLocation: true,
+      locations: [],
+    });
+    expect(result.success).toBe(false);
+    expect(result.error?.issues[0].path[0]).toBe("locations");
+  });
+
+  it("akzeptiert mehrere Standorte mit mindestens einem Standort", () => {
+    const result = employeeSchema.safeParse({
+      ...validData,
+      isMultipleLocation: true,
+      locations: ["standort-1"],
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it("akzeptiert mehrere Rollen", () => {
+    const result = employeeSchema.safeParse({
+      ...validData,
+      roles: ["Trainer", "Admin", "Kassierer"],
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it("akzeptiert alle Permissions als false", () => {
+    const noPermissions = {
+      employees: { view: false, create: false, edit: false, delete: false },
+      courses: { view: false, create: false, edit: false, delete: false },
+      rooms: { view: false, create: false, edit: false, delete: false },
+    };
+    const result = employeeSchema.safeParse({ ...validData, permissions: noPermissions });
+    expect(result.success).toBe(true);
+  });
+});
diff --git a/tests/schemas/userLoginSchema.test.ts b/tests/schemas/userLoginSchema.test.ts
new file mode 100644
index 0000000..b614781
--- /dev/null
+++ b/tests/schemas/userLoginSchema.test.ts
@@ -0,0 +1,40 @@
+import { describe, it, expect } from "vitest";
+import { userLoginSchema } from "@/src/modules/auth/validation/userLoginSchema";
+
+describe("userLoginSchema", () => {
+  it("akzeptiert valide Anmeldedaten", () => {
+    const result = userLoginSchema.safeParse({
+      email: "test@example.com",
+      password: "passwort123",
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it("lehnt ungültige E-Mail ab", () => {
+    const result = userLoginSchema.safeParse({
+      email: "kein-email",
+      password: "passwort123",
+    });
+    expect(result.success).toBe(false);
+    expect(result.error?.issues[0].path[0]).toBe("email");
+  });
+
+  it("lehnt Passwort unter 8 Zeichen ab", () => {
+    const result = userLoginSchema.safeParse({
+      email: "test@example.com",
+      password: "kurz",
+    });
+    expect(result.success).toBe(false);
+    expect(result.error?.issues[0].path[0]).toBe("password");
+  });
+
+  it("lehnt fehlende E-Mail ab", () => {
+    const result = userLoginSchema.safeParse({ password: "passwort123" });
+    expect(result.success).toBe(false);
+  });
+
+  it("lehnt fehlendes Passwort ab", () => {
+    const result = userLoginSchema.safeParse({ email: "test@example.com" });
+    expect(result.success).toBe(false);
+  });
+});
diff --git a/tests/schemas/userRegisterSchema.test.ts b/tests/schemas/userRegisterSchema.test.ts
new file mode 100644
index 0000000..17ed598
--- /dev/null
+++ b/tests/schemas/userRegisterSchema.test.ts
@@ -0,0 +1,100 @@
+import { describe, it, expect } from "vitest";
+import { userRegisterSchema } from "@/src/modules/auth/validation/userRegisterSchema";
+
+const validData = {
+  fullName: "Max Mustermann",
+  email: "max@example.com",
+  password: "Sicher!123",
+  passwordConfirm: "Sicher!123",
+  birthday: "1990-05-15",
+  plz: "10115",
+  place: "Berlin",
+  street: "Musterstraße 1",
+  gender: "Men" as const,
+};
+
+describe("userRegisterSchema", () => {
+  it("akzeptiert vollständig valide Daten", () => {
+    const result = userRegisterSchema.safeParse(validData);
+    expect(result.success).toBe(true);
+  });
+
+  it("lehnt zu kurzen Namen ab", () => {
+    const result = userRegisterSchema.safeParse({ ...validData, fullName: "X" });
+    expect(result.success).toBe(false);
+    expect(result.error?.issues[0].path[0]).toBe("fullName");
+  });
+
+  it("lehnt ungültige E-Mail ab", () => {
+    const result = userRegisterSchema.safeParse({ ...validData, email: "keine-email" });
+    expect(result.success).toBe(false);
+    expect(result.error?.issues[0].path[0]).toBe("email");
+  });
+
+  it("lehnt Passwort ohne Großbuchstaben ab", () => {
+    const result = userRegisterSchema.safeParse({
+      ...validData,
+      password: "sicher!123",
+      passwordConfirm: "sicher!123",
+    });
+    expect(result.success).toBe(false);
+    expect(result.error?.issues[0].path[0]).toBe("password");
+  });
+
+  it("lehnt Passwort ohne Sonderzeichen ab", () => {
+    const result = userRegisterSchema.safeParse({
+      ...validData,
+      password: "Sicher1234",
+      passwordConfirm: "Sicher1234",
+    });
+    expect(result.success).toBe(false);
+    expect(result.error?.issues[0].path[0]).toBe("password");
+  });
+
+  it("lehnt Passwort unter 8 Zeichen ab", () => {
+    const result = userRegisterSchema.safeParse({
+      ...validData,
+      password: "Ku!1",
+      passwordConfirm: "Ku!1",
+    });
+    expect(result.success).toBe(false);
+  });
+
+  it("lehnt nicht übereinstimmende Passwörter ab", () => {
+    const result = userRegisterSchema.safeParse({
+      ...validData,
+      passwordConfirm: "AndersPasswort!1",
+    });
+    expect(result.success).toBe(false);
+    expect(result.error?.issues[0].path[0]).toBe("passwordConfirm");
+  });
+
+  it("lehnt Geburtsdatum in der Zukunft ab", () => {
+    const result = userRegisterSchema.safeParse({ ...validData, birthday: "2099-01-01" });
+    expect(result.success).toBe(false);
+    expect(result.error?.issues[0].path[0]).toBe("birthday");
+  });
+
+  it("lehnt ungültiges Datumsformat ab", () => {
+    const result = userRegisterSchema.safeParse({ ...validData, birthday: "15.05.1990" });
+    expect(result.success).toBe(false);
+  });
+
+  it("lehnt fehlendes Geschlecht ab", () => {
+    const result = userRegisterSchema.safeParse({ ...validData, gender: "" });
+    expect(result.success).toBe(false);
+    expect(result.error?.issues[0].path[0]).toBe("gender");
+  });
+
+  it("lehnt ungültigen Gender-Wert ab", () => {
+    const result = userRegisterSchema.safeParse({ ...validData, gender: "Unknown" });
+    expect(result.success).toBe(false);
+  });
+
+  it("akzeptiert alle Gender-Werte", () => {
+    for (const gender of ["Men", "Woman", "Various"] as const) {
+      const result = userRegisterSchema.safeParse({ ...validData, gender });
+      expect(result.success).toBe(true);
+    }
+  });
+});
diff --git a/tests/utils/utils.test.ts b/tests/utils/utils.test.ts
new file mode 100644
index 0000000..cfe333c
--- /dev/null
+++ b/tests/utils/utils.test.ts
@@ -0,0 +1,37 @@
+import { describe, it, expect } from "vitest";
+import { cn } from "@/src/lib/utils";
+
+describe("cn", () => {
+  it("gibt eine einzelne Klasse zurück", () => {
+    expect(cn("px-4")).toBe("px-4");
+  });
+
+  it("kombiniert mehrere Klassen", () => {
+    expect(cn("px-4", "py-2", "text-sm")).toBe("px-4 py-2 text-sm");
+  });
+
+  it("überschreibt konfliktive Tailwind-Klassen (twMerge)", () => {
+    expect(cn("px-2", "px-4")).toBe("px-4");
+    expect(cn("text-sm", "text-lg")).toBe("text-lg");
+  });
+
+  it("ignoriert falsy-Werte (clsx)", () => {
+    expect(cn("px-4", false && "text-red", undefined, null as never, "py-2")).toBe("px-4 py-2");
+  });
+
+  it("verarbeitet bedingte Objekte", () => {
+    expect(cn({ "px-4": true, "py-2": false, "text-sm": true })).toBe("px-4 text-sm");
+  });
+
+  it("verarbeitet Arrays", () => {
+    expect(cn(["px-4", "py-2"])).toBe("px-4 py-2");
+  });
+
+  it("gibt leeren String bei keinen Argumenten zurück", () => {
+    expect(cn()).toBe("");
+  });
+
+  it("gibt leeren String bei nur falsy-Werten zurück", () => {
+    expect(cn(false, undefined, null as never)).toBe("");
+  });
+});
diff --git a/vitest.config.ts b/vitest.config.ts
index a4b3684..5bbfcd5 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -1,12 +1,29 @@
 import { defineConfig } from "vitest/config";
 import react from "@vitejs/plugin-react";
+import path from "path";
 
 export default defineConfig({
   plugins: [react()],
+  resolve: {
+    alias: {
+      "@": path.resolve(__dirname, "./"),
+    },
+  },
   test: {
     globals: true,
     environment: "jsdom",
     setupFiles: "./vitest.setup.ts",
-    include: ["**/*.test.{ts,tsx}"],
+    include: ["tests/**/*.test.{ts,tsx}"],
+    coverage: {
+      provider: "v8",
+      reporter: ["text", "lcov"],
+      include: [
+        "src/app/api/**",
+        "src/hooks/**",
+        "src/modules/**/schemas/**",
+        "src/modules/**/validation/**",
+        "src/lib/**",
+      ],
+    },
   },
 });
diff --git a/vitest.setup.ts b/vitest.setup.ts
index d0de870..a4e2be8 100644
--- a/vitest.setup.ts
+++ b/vitest.setup.ts
@@ -1 +1,6 @@
 import "@testing-library/jest-dom";
+import { server } from "./tests/msw/server";
+
+beforeAll(() => server.listen({ onUnhandledRequest: "warn" }));
+afterEach(() => server.resetHandlers());
+afterAll(() => server.close());