diff --git a/.github/workflows/lint-and-format.yaml b/.github/workflows/ci.yaml
similarity index 93%
rename from .github/workflows/lint-and-format.yaml
rename to .github/workflows/ci.yaml
index 1a36c18..ad21ea9 100644
--- a/.github/workflows/lint-and-format.yaml
+++ b/.github/workflows/ci.yaml
@@ -33,3 +33,6 @@ jobs:
 
       - name: Run ESLint
         run: npm run lint
+
+      - name: Run Tests
+        run: npm run test
diff --git a/package-lock.json b/package-lock.json
index c06388b..e28e435 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -15,6 +15,7 @@
       },
       "devDependencies": {
         "@eslint/js": "^10.0.1",
+        "@testing-library/react": "^16.3.3",
         "@types/node": "^24.13.3",
         "@types/react": "^19.2.18",
         "@types/react-dom": "^19.2.7",
@@ -23,10 +24,65 @@
         "eslint-plugin-react-hooks": "^7.1.1",
         "eslint-plugin-react-refresh": "^0.5.6",
         "globals": "^17.12.0",
+        "jsdom": "^30.1.0",
         "prettier": "^3.9.7",
         "typescript": "~6.0.2",
         "typescript-eslint": "^8.69.0",
-        "vite": "^8.3.0"
+        "vite": "^8.3.0",
+        "vitest": "^5.0.1"
+      }
+    },
+    "node_modules/@asamuzakjp/css-color": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-7.0.0.tgz",
+      "integrity": "sha512-IxddtGnnoidVSO6O/aiTueptbTThHvi2qGHu9/AWuD1J7i86Ox+jl+Y5SXcDH1RixzQlP2cjH/PjnlImZiAurQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@csstools/css-calc": "^3.3.0",
+        "@csstools/css-color-parser": "^4.2.0",
+        "@csstools/css-parser-algorithms": "^4.0.0",
+        "@csstools/css-tokenizer": "^4.0.0",
+        "lru-cache": "^11.5.2"
+      },
+      "engines": {
+        "node": "^22.22.2 || ^24.15.0 || >=26.0.0"
+      }
+    },
+    "node_modules/@asamuzakjp/css-color/node_modules/lru-cache": {
+      "version": "11.5.2",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-11.5.2.tgz",
+      "integrity": "sha512-4pfM1Ff0x50o0tQwb5ucw/RzNyD0/YJME6IVcStalZuMWxdt3sR3huStTtxz4PUmvZfRguvDejasvQ2kifR11g==",
+      "dev": true,
+      "license": "BlueOak-1.0.0",
+      "engines": {
+        "node": "20 || >=22"
+      }
+    },
+    "node_modules/@asamuzakjp/dom-selector": {
+      "version": "9.1.4",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/dom-selector/-/dom-selector-9.1.4.tgz",
+      "integrity": "sha512-ynDE7RDZM1z+YuSU+iGhRp8WcSXHqK9+G32ZEzsL35TKSoy72fYR7VfrJCQkWe3ciiIWGSTAIBc9XB5jVpqyTw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "bidi-js": "^1.1.0",
+        "css-tree": "^3.2.1",
+        "is-potential-custom-element-name": "^1.0.1",
+        "lru-cache": "^11.5.2"
+      },
+      "engines": {
+        "node": "^22.22.2 || ^24.15.0 || >=26.0.0"
+      }
+    },
+    "node_modules/@asamuzakjp/dom-selector/node_modules/lru-cache": {
+      "version": "11.5.2",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-11.5.2.tgz",
+      "integrity": "sha512-4pfM1Ff0x50o0tQwb5ucw/RzNyD0/YJME6IVcStalZuMWxdt3sR3huStTtxz4PUmvZfRguvDejasvQ2kifR11g==",
+      "dev": true,
+      "license": "BlueOak-1.0.0",
+      "engines": {
+        "node": "20 || >=22"
       }
     },
     "node_modules/@babel/code-frame": {
@@ -221,6 +277,16 @@
         "node": ">=6.0.0"
       }
     },
+    "node_modules/@babel/runtime": {
+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.29.7.tgz",
+      "integrity": "sha512-Nq8OhGWiZIZGV6hLHoyAKLLcJihP/xFeBMGJoUrxTX2psI8dCifzLhZISFb+VWS3wFMRDmCGw5R+dOySCqPLhw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
     "node_modules/@babel/template": {
       "version": "7.29.7",
       "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.29.7.tgz",
@@ -269,6 +335,19 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@bramus/specificity": {
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/@bramus/specificity/-/specificity-2.4.2.tgz",
+      "integrity": "sha512-ctxtJ/eA+t+6q2++vj5j7FYX3nRu311q1wfYH3xjlLOsczhlhxAg2FWNUXhpGvAw3BWo1xBcvOV6/YLc2r5FJw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "css-tree": "^3.0.0"
+      },
+      "bin": {
+        "specificity": "bin/cli.js"
+      }
+    },
     "node_modules/@cacheable/memory": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/@cacheable/memory/-/memory-2.2.0.tgz",
@@ -293,6 +372,146 @@
         "keyv": "^5.6.0"
       }
     },
+    "node_modules/@csstools/color-helpers": {
+      "version": "6.1.1",
+      "resolved": "https://registry.npmjs.org/@csstools/color-helpers/-/color-helpers-6.1.1.tgz",
+      "integrity": "sha512-gLNsunvwf3mCi5u5o46/Z/JcJMnhbHSaZ69rkgPzNM3J4s8hWwpPUQB6/tt0EDFyCiWzxANlx+2LJwpYj4zS1w==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT-0",
+      "engines": {
+        "node": ">=20.19.0"
+      }
+    },
+    "node_modules/@csstools/css-calc": {
+      "version": "3.4.0",
+      "resolved": "https://registry.npmjs.org/@csstools/css-calc/-/css-calc-3.4.0.tgz",
+      "integrity": "sha512-XQKj5B7QiZcHiegCOCAzcAOJdhGgWOHbbu62h5e5mkHnn8lWcfiJhllkqWmxu5zWR9jucPHuo1iTB56P033hcg==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.19.0"
+      },
+      "peerDependencies": {
+        "@csstools/css-parser-algorithms": "^4.0.0",
+        "@csstools/css-tokenizer": "^4.0.0"
+      }
+    },
+    "node_modules/@csstools/css-color-parser": {
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/@csstools/css-color-parser/-/css-color-parser-4.2.3.tgz",
+      "integrity": "sha512-y4LpL+lmpuyKDiEFq2PnZUVFdAjsoB/qQJod79yLNokXyW7jewi+/WJ69EfItj8A2unWtxXnGjw6LYXgXu5ZjA==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "@csstools/color-helpers": "^6.1.1",
+        "@csstools/css-calc": "^3.4.0"
+      },
+      "engines": {
+        "node": ">=20.19.0"
+      },
+      "peerDependencies": {
+        "@csstools/css-parser-algorithms": "^4.0.0",
+        "@csstools/css-tokenizer": "^4.0.0"
+      }
+    },
+    "node_modules/@csstools/css-parser-algorithms": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/@csstools/css-parser-algorithms/-/css-parser-algorithms-4.0.0.tgz",
+      "integrity": "sha512-+B87qS7fIG3L5h3qwJ/IFbjoVoOe/bpOdh9hAjXbvx0o8ImEmUsGXN0inFOnk2ChCFgqkkGFQ+TpM5rbhkKe4w==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.19.0"
+      },
+      "peerDependencies": {
+        "@csstools/css-tokenizer": "^4.0.0"
+      }
+    },
+    "node_modules/@csstools/css-syntax-patches-for-csstree": {
+      "version": "1.1.14",
+      "resolved": "https://registry.npmjs.org/@csstools/css-syntax-patches-for-csstree/-/css-syntax-patches-for-csstree-1.1.14.tgz",
+      "integrity": "sha512-HpbVXyrofRXpHpgkNIjU/3EWR4WJvOkO3emNK/L6X/mTJU7bGUI3AkkpoTNXznQLp0KRjLHELTGeKI5dIkI9JQ==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT-0",
+      "peerDependencies": {
+        "css-tree": "^3.2.1"
+      },
+      "peerDependenciesMeta": {
+        "css-tree": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@csstools/css-tokenizer": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/@csstools/css-tokenizer/-/css-tokenizer-4.0.0.tgz",
+      "integrity": "sha512-QxULHAm7cNu72w97JUNCBFODFaXpbDg+dP8b/oWFAZ2MTRppA3U00Y2L1HqaS4J6yBqxwa/Y3nMBaxVKbB/NsA==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.19.0"
+      }
+    },
     "node_modules/@eslint-community/eslint-utils": {
       "version": "4.10.1",
       "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.10.1.tgz",
@@ -421,6 +640,24 @@
         "node": "^20.19.0 || ^22.13.0 || >=24"
       }
     },
+    "node_modules/@exodus/bytes": {
+      "version": "1.15.1",
+      "resolved": "https://registry.npmjs.org/@exodus/bytes/-/bytes-1.15.1.tgz",
+      "integrity": "sha512-S6mL0yNB/Abt9Ei4tq8gDhcczc4S3+vQ4ra7vxnAf+YHC02srtqxKKZghx2Dq6p0e66THKwR6r8N6P95wEty7Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      },
+      "peerDependencies": {
+        "@noble/hashes": "^1.8.0 || ^2.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@noble/hashes": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@humanfs/core": {
       "version": "0.19.2",
       "resolved": "https://registry.npmjs.org/@humanfs/core/-/core-0.19.2.tgz",
@@ -859,6 +1096,81 @@
         "react": "^18 || ^19"
       }
     },
+    "node_modules/@testing-library/dom": {
+      "version": "10.4.2",
+      "resolved": "https://registry.npmjs.org/@testing-library/dom/-/dom-10.4.2.tgz",
+      "integrity": "sha512-yzr2S9HyAIdhz2/6qHgbs665Q7PKVcDF05vsOlHPxG1mo36gKVesdYVeDLnXgfjJ03CrKRk08knc6+E/9m8v2Q==",
+      "dev": true,
+      "license": "MIT",
+      "peer": true,
+      "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/react": {
+      "version": "16.3.3",
+      "resolved": "https://registry.npmjs.org/@testing-library/react/-/react-16.3.3.tgz",
+      "integrity": "sha512-Uo193NgQbPMz6lrrhtRQQFcMC6Re/ELLFbbuVL30WDlZxlpZf9/lMHTAVxPRLw1q1iu9OJmR1c2BLiENRstdBg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/runtime": "^7.12.5"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "@testing-library/dom": "^10.0.0",
+        "@types/react": "^18.0.0 || ^19.0.0",
+        "@types/react-dom": "^18.0.0 || ^19.0.0",
+        "react": "^18.0.0 || ^19.0.0",
+        "react-dom": "^18.0.0 || ^19.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@types/react": {
+          "optional": true
+        },
+        "@types/react-dom": {
+          "optional": true
+        }
+      }
+    },
+    "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",
+      "peer": true
+    },
+    "node_modules/@types/chai": {
+      "version": "5.2.3",
+      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-5.2.3.tgz",
+      "integrity": "sha512-Mw558oeA9fFbv65/y4mHtXDs9bPnFMZAL/jxdPFUpOHHIXX91mcgEHbS5Lahr+pwZFR8A7GQleRWeI6cGFC2UA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/deep-eql": "*",
+        "assertion-error": "^2.0.1"
+      }
+    },
+    "node_modules/@types/deep-eql": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/@types/deep-eql/-/deep-eql-4.0.2.tgz",
+      "integrity": "sha512-c9h9dVVMigMPc4bwTvC5dxqtqJZwQPePsWjPlpSOnojbor6pGqdk541lfA7AqFQr5pB1BRdq0juY9db81BwyFw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@types/esrecurse": {
       "version": "4.3.1",
       "resolved": "https://registry.npmjs.org/@types/esrecurse/-/esrecurse-4.3.1.tgz",
@@ -1183,6 +1495,44 @@
         }
       }
     },
+    "node_modules/@vitest/mocker": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/@vitest/mocker/-/mocker-5.0.1.tgz",
+      "integrity": "sha512-6K1DoBNAPGvuOcSsGA4D6x+5zEEff/KmOOP3uetT2TrGpVfI+HRHRnJJfKi5ib/g1vx8IYHQD8s0pbJz8WQI7Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/trace-mapping": "0.3.31",
+        "@vitest/spy": "5.0.1",
+        "estree-walker": "^3.0.3",
+        "magic-string": "^1.2.3"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "msw": "^2.4.9",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
+      },
+      "peerDependenciesMeta": {
+        "msw": {
+          "optional": true
+        },
+        "vite": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@vitest/spy": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/@vitest/spy/-/spy-5.0.1.tgz",
+      "integrity": "sha512-rbto/mF/SGERxEgYOek7Xm6B9b+y+mVoo+f4b2LymYO8zM1b7uB5nHuhVMTP2hxdzgxvGiZYGxGIaMvL5y180Q==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      }
+    },
     "node_modules/acorn": {
       "version": "8.18.0",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.18.0.tgz",
@@ -1223,6 +1573,52 @@
         "url": "https://github.com/sponsors/epoberezkin"
       }
     },
+    "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",
+      "peer": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/ansi-styles": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-5.2.0.tgz",
+      "integrity": "sha512-Cxwpt2SfTzTtXcfOlzGEee8O+c+MmUgGrNiBcXnuWxuFJHe6a5Hz7qwhwe5OgaSYI0IJvkLqWX1ASG+cJOkEiA==",
+      "dev": true,
+      "license": "MIT",
+      "peer": true,
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "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",
+      "peer": true,
+      "dependencies": {
+        "dequal": "^2.0.3"
+      }
+    },
+    "node_modules/assertion-error": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-2.0.1.tgz",
+      "integrity": "sha512-Izi8RQcffqCeNVgFigKli1ssklIbpHnCYc6AknXGYoB6grJqyeby7jv12JUQgmTAnIDnbck1uxksT4dzN3PWBA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/balanced-match": {
       "version": "4.0.4",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-4.0.4.tgz",
@@ -1246,6 +1642,16 @@
         "node": ">=6.0.0"
       }
     },
+    "node_modules/bidi-js": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/bidi-js/-/bidi-js-1.1.0.tgz",
+      "integrity": "sha512-fX1Onk0tdVPC7obPWB5EbJ1z7NVhLq4m2xZLq2YXBkxzMXIGRpNMU88n0EPgWseKl12J7zXs7qrDxPK4sRs2fg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "require-from-string": "^2.0.2"
+      }
+    },
     "node_modules/brace-expansion": {
       "version": "5.0.12",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-5.0.12.tgz",
@@ -1328,6 +1734,16 @@
       ],
       "license": "CC-BY-4.0"
     },
+    "node_modules/chai": {
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       }
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+    "node_modules/tldts": {
+      "version": "7.4.13",
+      "resolved": "https://registry.npmjs.org/tldts/-/tldts-7.4.13.tgz",
+      "integrity": "sha512-iHtaIWWIbMDkCeJdTBzZFGgbluE5J+oHlb2g7+oAz1S1gpuVpabRZdQyd471Vl8UUkcz2vXSL8xZH2kyCe8tfA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "tldts-core": "^7.4.13"
+      },
+      "bin": {
+        "tldts": "bin/cli.js"
+      }
+    },
+    "node_modules/tldts-core": {
+      "version": "7.4.13",
+      "resolved": "https://registry.npmjs.org/tldts-core/-/tldts-core-7.4.13.tgz",
+      "integrity": "sha512-mbYsrih5FRtGxs3Usvl/PqwJsNpp+jsmrdFviiK02teHDG0/HebBG/pqCylje3kzgXYzuLoHJF/0mz9W53t8Xg==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/tough-cookie": {
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-6.0.2.tgz",
+      "integrity": "sha512-exgYmnmL/sJpR3upZfXG5PoatXQii55xAiXGXzY+sROLZ/Y+SLcp9PgJNI9Vz37HpQ74WvDcLT8eqm+kV3FzrA==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "tldts": "^7.0.5"
+      },
+      "engines": {
+        "node": ">=16"
+      }
+    },
+    "node_modules/tr46": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-6.0.0.tgz",
+      "integrity": "sha512-bLVMLPtstlZ4iMQHpFHTR7GAGj2jxi8Dg0s2h2MafAE4uSWF98FC/3MomU51iQAMf8/qDUbKWf5GxuvvVcXEhw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "punycode": "^2.3.1"
+      },
+      "engines": {
+        "node": ">=20"
+      }
+    },
     "node_modules/ts-api-utils": {
       "version": "2.5.0",
       "resolved": "https://registry.npmjs.org/ts-api-utils/-/ts-api-utils-2.5.0.tgz",
@@ -2616,6 +3400,16 @@
         "typescript": ">=4.8.4 <6.1.0"
       }
     },
+    "node_modules/undici": {
+      "version": "8.10.2",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-8.10.2.tgz",
+      "integrity": "sha512-/y4/bH9YNU5hi9NIrpOuvGXFcxrj3CMrV+/AYpowAYTpHn8gX/XPFjNy766FPoYY0miQhdW977JFWKGNhBdwyQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=22.19.0"
+      }
+    },
     "node_modules/undici-types": {
       "version": "7.18.2",
       "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.18.2.tgz",
@@ -2742,6 +3536,137 @@
         }
       }
     },
+    "node_modules/vitest": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-5.0.1.tgz",
+      "integrity": "sha512-iA95lQbKEkvrtTkdAgnWbXfbipWiiWe/hDl2P5tMi6WFwD76G0NxXAGp/M9EOcYupeGJRr6wppMc7CoA41TQjg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/chai": "^5.2.2",
+        "@vitest/mocker": "5.0.1",
+        "chai": "^6.2.2",
+        "es-module-lexer": "^2.3.2",
+        "expect-type": "^1.4.0",
+        "magic-string": "^1.2.3",
+        "obug": "^2.1.4",
+        "picomatch": "^4.0.7",
+        "std-env": "^4.2.0",
+        "tinybench": "6.1.4",
+        "tinyexec": "1.3.0",
+        "tinyglobby": "^0.2.17",
+        "why-is-node-running": "^2.3.0"
+      },
+      "bin": {
+        "vitest": "vitest.mjs"
+      },
+      "engines": {
+        "node": "^22.12.0 || ^24.0.0 || >=26.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@opentelemetry/api": "^1.9.0",
+        "@types/node": "^22.0.0 || >=24.0.0",
+        "@vitest/browser-playwright": "5.0.1",
+        "@vitest/browser-preview": "5.0.1",
+        "@vitest/browser-webdriverio": "^5.0.0-beta.5 || >=5.0.0",
+        "@vitest/coverage-istanbul": "5.0.1",
+        "@vitest/coverage-v8": "5.0.1",
+        "@vitest/ui": "5.0.1",
+        "happy-dom": "*",
+        "jsdom": "*",
+        "vite": "^6.4.0 || ^7.0.0 || ^8.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@opentelemetry/api": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser-playwright": {
+          "optional": true
+        },
+        "@vitest/browser-preview": {
+          "optional": true
+        },
+        "@vitest/browser-webdriverio": {
+          "optional": true
+        },
+        "@vitest/coverage-istanbul": {
+          "optional": true
+        },
+        "@vitest/coverage-v8": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        },
+        "vite": {
+          "optional": false
+        }
+      }
+    },
+    "node_modules/w3c-xmlserializer": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-5.0.0.tgz",
+      "integrity": "sha512-o8qghlI8NZHU1lLPrpi2+Uq7abh4GGPpYANlalzWxyWteJOCsr/P+oPBA49TOLu5FTZO4d3F9MnWJfiMo4BkmA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "xml-name-validator": "^5.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/webidl-conversions": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-8.0.1.tgz",
+      "integrity": "sha512-BMhLD/Sw+GbJC21C/UgyaZX41nPt8bUTg+jWyDeg7e7YN4xOM05YPSIXceACnXVtqyEw/LMClUQMtMZ+PGGpqQ==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=20"
+      }
+    },
+    "node_modules/whatwg-mimetype": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-5.0.0.tgz",
+      "integrity": "sha512-sXcNcHOC51uPGF0P/D4NVtrkjSU2fNsm9iog4ZvZJsL3rjoDAzXZhkm2MWt1y+PUdggKAYVoMAIYcs78wJ51Cw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=20"
+      }
+    },
+    "node_modules/whatwg-url": {
+      "version": "17.1.1",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-17.1.1.tgz",
+      "integrity": "sha512-ohjk1mdUebJVadRt3bAhQhx8lSnISq+GDttK79LFl8EHQkAPvzwctoasC4hs8tBt6kLAncBWWyq1N52qEfKvDw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@exodus/bytes": "^1.15.1",
+        "tr46": "^6.0.0",
+        "webidl-conversions": "^8.0.1"
+      },
+      "engines": {
+        "node": "^22.14.0 || >=24.0.0"
+      }
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -2758,6 +3683,23 @@
         "node": ">= 8"
       }
     },
+    "node_modules/why-is-node-running": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/word-wrap": {
       "version": "1.2.5",
       "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
@@ -2768,6 +3710,23 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/xml-name-validator": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-5.0.0.tgz",
+      "integrity": "sha512-EvGK8EJ3DhaHfbRlETOWAS5pO9MZITeauHKJyb8wyajUfQUenkIg2MvLDTZ4T/TgIcm3HU0TFBgWWboAZ30UHg==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/xmlchars": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/yallist": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
diff --git a/package.json b/package.json
index 8451f13..519e80f 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,8 @@
     "build": "tsc -b && vite build",
     "lint": "eslint .",
     "preview": "vite preview",
-    "fmt": "npx prettier . --write"
+    "fmt": "npx prettier . --write",
+    "test": "vitest run"
   },
   "dependencies": {
     "@tanstack/react-query": "^5.102.8",
@@ -18,6 +19,7 @@
   },
   "devDependencies": {
     "@eslint/js": "^10.0.1",
+    "@testing-library/react": "^16.3.3",
     "@types/node": "^24.13.3",
     "@types/react": "^19.2.18",
     "@types/react-dom": "^19.2.7",
@@ -26,9 +28,11 @@
     "eslint-plugin-react-hooks": "^7.1.1",
     "eslint-plugin-react-refresh": "^0.5.6",
     "globals": "^17.12.0",
+    "jsdom": "^30.1.0",
     "prettier": "^3.9.7",
     "typescript": "~6.0.2",
     "typescript-eslint": "^8.69.0",
-    "vite": "^8.3.0"
+    "vite": "^8.3.0",
+    "vitest": "^5.0.1"
   }
 }
diff --git a/tests/components/ViewCity.test.tsx b/tests/components/ViewCity.test.tsx
new file mode 100644
index 0000000..c5ec3e4
--- /dev/null
+++ b/tests/components/ViewCity.test.tsx
@@ -0,0 +1,73 @@
+// @vitest-environment jsdom
+
+import { render, screen } from "@testing-library/react"
+import { beforeEach, describe, expect, it, vi } from "vitest"
+import ViewCity from "../../src/components/ViewCity"
+
+const { mockUseGetCityCoordinates, mockUseGetWeather } = vi.hoisted(() => ({
+  mockUseGetCityCoordinates: vi.fn(),
+  mockUseGetWeather: vi.fn(),
+}))
+
+vi.mock("../../src/hooks/fetchCities/useGetCityCoordinates", () => ({
+  default: mockUseGetCityCoordinates,
+}))
+
+vi.mock("../../src/hooks/fetchWeather/useGetWeather", () => ({
+  default: mockUseGetWeather,
+}))
+
+describe("ViewCity", () => {
+  beforeEach(() => {
+    mockUseGetCityCoordinates.mockReturnValue({
+      result: [{ latitude: 59.9, longitude: 10.7 }],
+    })
+  })
+
+  it("renders the current temperature and wind speed", () => {
+    mockUseGetWeather.mockReturnValue({
+      isLoading: false,
+      error: null,
+      result: {
+        properties: {
+          timeseries: [
+            {
+              data: {
+                instant: {
+                  details: { air_temperature: 12.5, wind_speed: 4.2 },
+                },
+              },
+            },
+          ],
+        },
+      },
+    })
+
+    render(<ViewCity city="Oslo" />)
+
+    expect(screen.getByText("Været i Oslo")).toBeTruthy()
+    expect(screen.getByText("Temperatur: 12.5")).toBeTruthy()
+    expect(screen.getByText("Vindhastighet: 4.2")).toBeTruthy()
+    expect(mockUseGetCityCoordinates).toHaveBeenCalledWith({ cityName: "Oslo" })
+    expect(mockUseGetWeather).toHaveBeenCalledWith(59.9, 10.7)
+  })
+
+  it("renders a loading message while weather data is loading", () => {
+    mockUseGetWeather.mockReturnValue({ isLoading: true, error: null })
+
+    render(<ViewCity city="Oslo" />)
+
+    expect(screen.getByText("Laster")).toBeTruthy()
+  })
+
+  it("renders an error message when the weather request fails", () => {
+    mockUseGetWeather.mockReturnValue({
+      isLoading: false,
+      error: new Error("Request failed"),
+    })
+
+    render(<ViewCity city="Oslo" />)
+
+    expect(screen.getByText("Det skjedde en feil")).toBeTruthy()
+  })
+})
diff --git a/tests/components/listItem.test.tsx b/tests/components/listItem.test.tsx
new file mode 100644
index 0000000..d568542
--- /dev/null
+++ b/tests/components/listItem.test.tsx
@@ -0,0 +1,36 @@
+// @vitest-environment jsdom
+
+import { render, screen } from "@testing-library/react"
+import { describe, expect, it } from "vitest"
+import ListItem from "../../src/components/listItem"
+
+describe("ListItem", () => {
+  it("renders city weather, forecast temperatures, and a rain icon", () => {
+    render(
+      <ListItem
+        city={{
+          name: "Oslo",
+          temperature: 10.6,
+          precipitation: 0.7,
+          nextDays: [
+            { time: "2026-09-18T12:00:00Z", temperature: 8.4 },
+            { time: "2026-09-19T12:00:00Z", temperature: 6.6 },
+          ],
+        }}
+      />
+    )
+
+    expect(screen.getByText("Oslo:")).toBeTruthy()
+    expect(screen.getByText("🌧️")).toBeTruthy()
+    expect(screen.getByText("11°")).toBeTruthy()
+    expect(screen.getByText("8°")).toBeTruthy()
+    expect(screen.getByText("7°")).toBeTruthy()
+  })
+
+  it("shows fallback values when weather data is unavailable", () => {
+    render(<ListItem city={{ name: "Trondheim" }} />)
+
+    expect(screen.getByText("⛅")).toBeTruthy()
+    expect(screen.getByText("—")).toBeTruthy()
+  })
+})
diff --git a/tests/components/location-list.test.tsx b/tests/components/location-list.test.tsx
new file mode 100644
index 0000000..3e1422c
--- /dev/null
+++ b/tests/components/location-list.test.tsx
@@ -0,0 +1,64 @@
+// @vitest-environment jsdom
+
+import { render, screen } from "@testing-library/react"
+import { beforeEach, describe, expect, it, vi } from "vitest"
+import LocationList from "../../src/components/location-list"
+
+const { mockUseGetWeatherForCities } = vi.hoisted(() => ({
+  mockUseGetWeatherForCities: vi.fn(),
+}))
+
+vi.mock("../../src/hooks/fetchWeather/useGetWeather", () => ({
+  useGetWeatherForCities: mockUseGetWeatherForCities,
+}))
+
+const weatherResponse = (temperature: number, precipitation: number) => ({
+  properties: {
+    timeseries: [
+      {
+        time: "2026-09-17T10:00:00Z",
+        data: {
+          instant: { details: { air_temperature: temperature } },
+          next_6_hours: { details: { precipitation_amount: precipitation } },
+        },
+      },
+    ],
+  },
+})
+
+describe("LocationList", () => {
+  beforeEach(() => {
+    mockUseGetWeatherForCities.mockReset()
+  })
+
+  it("renders a loading message while city forecasts are loading", () => {
+    mockUseGetWeatherForCities.mockReturnValue({ isLoading: true, results: [] })
+
+    render(<LocationList />)
+
+    expect(screen.getByText("Loading...")).toBeTruthy()
+  })
+
+  it("renders a weather row for every configured city", () => {
+    mockUseGetWeatherForCities.mockReturnValue({
+      isLoading: false,
+      results: [
+        weatherResponse(11, 0),
+        weatherResponse(8, 0.7),
+        weatherResponse(6, 0),
+        weatherResponse(25, 0),
+      ],
+    })
+
+    render(<LocationList />)
+
+    expect(screen.getByText("City")).toBeTruthy()
+    expect(screen.getByText("Next 3 Days")).toBeTruthy()
+    expect(screen.getByText("Oslo:")).toBeTruthy()
+    expect(screen.getByText("Sørumsand:")).toBeTruthy()
+    expect(screen.getByText("Trondheim:")).toBeTruthy()
+    expect(screen.getByText("Las Vegas:")).toBeTruthy()
+    expect(screen.getByText("25°")).toBeTruthy()
+    expect(screen.getAllByText("🌧️")).toHaveLength(1)
+  })
+})
diff --git a/tests/hooks/fetchCities/useGetCityCoordinates.test.ts b/tests/hooks/fetchCities/useGetCityCoordinates.test.ts
new file mode 100644
index 0000000..c0d2790
--- /dev/null
+++ b/tests/hooks/fetchCities/useGetCityCoordinates.test.ts
@@ -0,0 +1,66 @@
+// @vitest-environment jsdom
+
+import { createElement, type PropsWithChildren } from "react"
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query"
+import { renderHook, waitFor } from "@testing-library/react"
+import { afterEach, expect, it, vi } from "vitest"
+import type { citySearchResult } from "../../../src/hooks/fetchCities/types"
+import useGetCityCoordinates from "../../../src/hooks/fetchCities/useGetCityCoordinates"
+
+afterEach(() => {
+  vi.unstubAllGlobals()
+})
+
+function createQueryClientWrapper() {
+  const queryClient = new QueryClient({
+    defaultOptions: { queries: { retry: false } },
+  })
+
+  return ({ children }: PropsWithChildren) =>
+    createElement(QueryClientProvider, { client: queryClient }, children)
+}
+
+it("should fetch the city search results", async () => {
+  const mockResponse: citySearchResult = {
+    results: [
+      {
+        name: "Oslo",
+        latitude: 69,
+        longitude: 69,
+        elevation: 420,
+        timezone: "Europe/Oslo",
+      },
+      {
+        name: "Oslo",
+        latitude: 0,
+        longitude: 0,
+        elevation: 10,
+        timezone: "America/Chicago",
+      },
+    ],
+  }
+
+  const fetchMock = vi.fn<typeof fetch>()
+  fetchMock.mockResolvedValue(
+    new Response(JSON.stringify(mockResponse), {
+      status: 200,
+      headers: { "Content-Type": "application/json" },
+    })
+  )
+
+  vi.stubGlobal("fetch", fetchMock)
+
+  const { result } = renderHook(
+    () => useGetCityCoordinates({ cityName: "Oslo" }),
+    { wrapper: createQueryClientWrapper() }
+  )
+
+  await waitFor(() => {
+    expect(result.current.result).toEqual(mockResponse.results)
+  })
+
+  expect(fetchMock).toHaveBeenCalledTimes(1)
+  expect(fetchMock).toHaveBeenCalledWith(
+    "https://geocoding-api.open-meteo.com/v1/search?name=Oslo"
+  )
+})
diff --git a/tsconfig.app.json b/tsconfig.app.json
index 6830b6f..72c4a37 100644
--- a/tsconfig.app.json
+++ b/tsconfig.app.json
@@ -22,5 +22,5 @@
     "erasableSyntaxOnly": true,
     "noFallthroughCasesInSwitch": true
   },
-  "include": ["src"]
+  "include": ["src", "tests"]
 }