diff --git a/.gitea/workflows/deploy.yml b/.gitea/workflows/deploy.yml
index 50fdfc4..ce88108 100644
--- a/.gitea/workflows/deploy.yml
+++ b/.gitea/workflows/deploy.yml
@@ -22,6 +22,9 @@ jobs:
       - name: Format check
         run: npm run format:check
 
+      - name: Test
+        run: npm test
+
       - name: Build
         run: npm run build
         env:
diff --git a/.pi/skills/arkie-frontend-onboarding/SKILL.md b/.pi/skills/arkie-frontend-onboarding/SKILL.md
index d0eae46..d1685f2 100644
--- a/.pi/skills/arkie-frontend-onboarding/SKILL.md
+++ b/.pi/skills/arkie-frontend-onboarding/SKILL.md
@@ -48,6 +48,7 @@ For code changes, run:
 ```bash
 npx tsc --noEmit
 npm run format:check
+npm test
 ```
 
 Run `npm run build` when changes affect routes, config, build, deploy, env vars, or dependencies.
diff --git a/AGENTS.md b/AGENTS.md
index 143b393..720ea42 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -24,6 +24,7 @@ Before proposing a push or deploy, run:
 ```bash
 npx tsc --noEmit
 npm run format:check
+npm test
 ```
 
 If code formatting is needed, run:
@@ -64,9 +65,10 @@ VITE_DISABLE_ADMIN=true
 1. `npm ci`
 2. `npx tsc --noEmit`
 3. `npm run format:check`
-4. `npm run build` with production public env
-5. rsync `dist/` to both frontend servers
-6. compare remote `index.html` checksums
+4. `npm test`
+5. `npm run build` with production public env
+6. rsync `dist/` to both frontend servers
+7. compare remote `index.html` checksums
 
 ## Agent behavior preferences
 
diff --git a/README.md b/README.md
index 5167314..58209c4 100644
--- a/README.md
+++ b/README.md
@@ -34,6 +34,7 @@ npm run dev           # start Vite dev server
 npx tsc --noEmit      # TypeScript check; CI requires this
 npm run format:check  # Prettier check; CI requires this
 npm run format        # format source files
+npm test              # run Vitest test suite
 npm run build         # production build to dist/
 npm run preview       # preview built app locally
 ```
@@ -43,6 +44,7 @@ Before pushing, run at least:
 ```bash
 npx tsc --noEmit
 npm run format:check
+npm test
 ```
 
 ## Environment variables
@@ -86,7 +88,7 @@ Important config files:
 
 - `main` is the deploy branch. Pushing to `main` triggers `.gitea/workflows/deploy.yml`.
 - `terry-staging` exists as a staging/work branch for later work.
-- The deploy workflow runs `npm ci`, `npx tsc --noEmit`, `npm run format:check`, `npm run build`, then rsyncs `dist/` to both frontend servers and verifies matching checksums.
+- The deploy workflow runs `npm ci`, `npx tsc --noEmit`, `npm run format:check`, `npm test`, `npm run build`, then rsyncs `dist/` to both frontend servers and verifies matching checksums.
 
 See also:
 
diff --git a/docs/deploy.md b/docs/deploy.md
index 9425cda..bdb74cb 100644
--- a/docs/deploy.md
+++ b/docs/deploy.md
@@ -19,23 +19,24 @@ on:
 2. Install dependencies with `npm ci`.
 3. Type check with `npx tsc --noEmit`.
 4. Check formatting with `npm run format:check`.
-5. Build with `npm run build` using:
+5. Run tests with `npm test`.
+6. Build with `npm run build` using:
 
    ```bash
    VITE_API_URL=https://api.ark-library.com
    VITE_DISABLE_ADMIN=true
    ```
 
-6. Configure SSH key from `DEPLOY_KEY` secret.
-7. `rsync --delete` built `dist/` to both frontend servers:
+7. Configure SSH key from `DEPLOY_KEY` secret.
+8. `rsync --delete` built `dist/` to both frontend servers:
 
    ```text
    ec2-user@FRONTEND_1_HOST:/var/www/ark-library/
    ec2-user@FRONTEND_2_HOST:/var/www/ark-library/
    ```
 
-8. Verify both servers have matching `index.html` SHA-256 checksums.
-9. Remove temporary SSH key.
+9. Verify both servers have matching `index.html` SHA-256 checksums.
+10. Remove temporary SSH key.
 
 ## Required repository secrets
 
diff --git a/docs/workflow.md b/docs/workflow.md
index 41aa722..518639c 100644
--- a/docs/workflow.md
+++ b/docs/workflow.md
@@ -43,6 +43,7 @@ Run:
 ```bash
 npx tsc --noEmit
 npm run format:check
+npm test
 npm run build
 ```
 
diff --git a/package-lock.json b/package-lock.json
index 9704a3a..6f40b01 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -18,17 +18,29 @@
         "wagmi": "^2.19.5"
       },
       "devDependencies": {
+        "@testing-library/jest-dom": "^6.9.1",
+        "@testing-library/react": "^16.3.2",
+        "@testing-library/user-event": "^14.6.1",
         "@types/react": "^18.3.12",
         "@types/react-dom": "^18.3.1",
         "@vitejs/plugin-react": "^4.3.3",
         "autoprefixer": "^10.4.20",
+        "jsdom": "^29.1.1",
         "postcss": "^8.4.47",
         "prettier": "^3.8.3",
         "tailwindcss": "^3.4.14",
         "typescript": "^5.6.3",
-        "vite": "^5.4.10"
+        "vite": "^5.4.10",
+        "vitest": "^2.1.9"
       }
     },
+    "node_modules/@adobe/css-tools": {
+      "version": "4.4.4",
+      "resolved": "https://registry.npmjs.org/@adobe/css-tools/-/css-tools-4.4.4.tgz",
+      "integrity": "sha512-Elp+iwUx5rN5+Y8xLt5/GRoG20WGoDCQ/1Fb+1LiGtvwbDavuSk0jhD/eZdckHAuzcDzccnkv+rEjyWfRx18gg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@adraffy/ens-normalize": {
       "version": "1.11.1",
       "resolved": "https://registry.npmjs.org/@adraffy/ens-normalize/-/ens-normalize-1.11.1.tgz",
@@ -48,6 +60,57 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/@asamuzakjp/css-color": {
+      "version": "5.1.11",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-5.1.11.tgz",
+      "integrity": "sha512-KVw6qIiCTUQhByfTd78h2yD1/00waTmm9uy/R7Ck/ctUyAPj+AEDLkQIdJW0T8+qGgj3j5bpNKK7Q3G+LedJWg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@asamuzakjp/generational-cache": "^1.0.1",
+        "@csstools/css-calc": "^3.2.0",
+        "@csstools/css-color-parser": "^4.1.0",
+        "@csstools/css-parser-algorithms": "^4.0.0",
+        "@csstools/css-tokenizer": "^4.0.0"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      }
+    },
+    "node_modules/@asamuzakjp/dom-selector": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/dom-selector/-/dom-selector-7.1.1.tgz",
+      "integrity": "sha512-67RZDnYRc8H/8MLDgQCDE//zoqVFwajkepHZgmXrbwybzXOEwOWGPYGmALYl9J2DOLfFPPs6kKCqmbzV895hTQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@asamuzakjp/generational-cache": "^1.0.1",
+        "@asamuzakjp/nwsapi": "^2.3.9",
+        "bidi-js": "^1.0.3",
+        "css-tree": "^3.2.1",
+        "is-potential-custom-element-name": "^1.0.1"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      }
+    },
+    "node_modules/@asamuzakjp/generational-cache": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/generational-cache/-/generational-cache-1.0.1.tgz",
+      "integrity": "sha512-wajfB8KqzMCN2KGNFdLkReeHncd0AslUSrvHVvvYWuU8ghncRJoA50kT3zP9MVL0+9g4/67H+cdvBskj9THPzg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      }
+    },
+    "node_modules/@asamuzakjp/nwsapi": {
+      "version": "2.3.9",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/nwsapi/-/nwsapi-2.3.9.tgz",
+      "integrity": "sha512-n8GuYSrI9bF7FFZ/SjhwevlHc8xaVlb/7HmHelnc/PZXBD2ZR49NnN9sMMuDdEGPeeRQ5d0hqlSlEpgCX3Wl0Q==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@babel/code-frame": {
       "version": "7.29.0",
       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.29.0.tgz",
@@ -418,6 +481,19 @@
         "url": "https://paulmillr.com/funding/"
       }
     },
+    "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/@coinbase/cdp-sdk": {
       "version": "1.48.3",
       "resolved": "https://registry.npmjs.org/@coinbase/cdp-sdk/-/cdp-sdk-1.48.3.tgz",
@@ -537,6 +613,146 @@
         "url": "https://paulmillr.com/funding/"
       }
     },
+    "node_modules/@csstools/color-helpers": {
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/@csstools/color-helpers/-/color-helpers-6.0.2.tgz",
+      "integrity": "sha512-LMGQLS9EuADloEFkcTBR3BwV/CGHV7zyDxVRtVDTwdI2Ca4it0CCVTT9wCkxSgokjE5Ho41hEPgb8OEUwoXr6Q==",
+      "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": "3.2.1",
+      "resolved": "https://registry.npmjs.org/@csstools/css-calc/-/css-calc-3.2.1.tgz",
+      "integrity": "sha512-DtdHlgXh5ZkA43cwBcAm+huzgJiwx3ZTWVjBs94kwz2xKqSimDA3lBgCjphYgwgVUMWatSM0pDd8TILB1yrVVg==",
+      "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": "4.1.1",
+      "resolved": "https://registry.npmjs.org/@csstools/css-color-parser/-/css-color-parser-4.1.1.tgz",
+      "integrity": "sha512-eZ5XOtyhK+mggRafYUWzA0tvaYOFgdY8AkgQiCJF9qNAePnUo/zmsqqYubBBb3sQ8uNUaSKTY9s9klfRaAXL0g==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "@csstools/color-helpers": "^6.0.2",
+        "@csstools/css-calc": "^3.2.1"
+      },
+      "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": "1.1.4",
+      "resolved": "https://registry.npmjs.org/@csstools/css-syntax-patches-for-csstree/-/css-syntax-patches-for-csstree-1.1.4.tgz",
+      "integrity": "sha512-wgsqt92b7C7tQhIdPNxj0n9zuUbQlvAuI1exyzeNrOKOi62SD7ren8zqszmpVREjAOqg8cD2FqYhQfAuKjk4sw==",
+      "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/@ecies/ciphers": {
       "version": "0.2.6",
       "resolved": "https://registry.npmjs.org/@ecies/ciphers/-/ciphers-0.2.6.tgz",
@@ -999,6 +1215,24 @@
         "node": ">=14"
       }
     },
+    "node_modules/@exodus/bytes": {
+      "version": "1.15.0",
+      "resolved": "https://registry.npmjs.org/@exodus/bytes/-/bytes-1.15.0.tgz",
+      "integrity": "sha512-UY0nlA+feH81UGSHv92sLEPLCeZFjXOuHhrIo0HQydScuQc8s0A7kL/UdgwgDq8g8ilksmuoF35YVTNphV2aBQ==",
+      "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/@gemini-wallet/core": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/@gemini-wallet/core/-/core-0.3.2.tgz",
@@ -4670,6 +4904,104 @@
         "react": "^18 || ^19"
       }
     },
+    "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",
+      "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/jest-dom": {
+      "version": "6.9.1",
+      "resolved": "https://registry.npmjs.org/@testing-library/jest-dom/-/jest-dom-6.9.1.tgz",
+      "integrity": "sha512-zIcONa+hVtVSSep9UT3jZ5rizo2BsxgyDYU7WFD5eICBE7no3881HGeb/QkGfsJs6JTkY1aQhT7rIPC7e+0nnA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@adobe/css-tools": "^4.4.0",
+        "aria-query": "^5.0.0",
+        "css.escape": "^1.5.1",
+        "dom-accessibility-api": "^0.6.3",
+        "picocolors": "^1.1.1",
+        "redent": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=14",
+        "npm": ">=6",
+        "yarn": ">=1"
+      }
+    },
+    "node_modules/@testing-library/jest-dom/node_modules/dom-accessibility-api": {
+      "version": "0.6.3",
+      "resolved": "https://registry.npmjs.org/dom-accessibility-api/-/dom-accessibility-api-0.6.3.tgz",
+      "integrity": "sha512-7ZgogeTnjuHbo+ct10G9Ffp0mif17idi0IyWNVA/wcwcm7NPOD/WEHVP3n7n3MhXqxoIYm8d6MuZohYWIZ4T3w==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@testing-library/react": {
+      "version": "16.3.2",
+      "resolved": "https://registry.npmjs.org/@testing-library/react/-/react-16.3.2.tgz",
+      "integrity": "sha512-XU5/SytQM+ykqMnAnvB2umaJNIOsLF3PVv//1Ew4CTcpz0/BRyy/af40qqrt7SjKpDdT1saBMc42CUok5gaw+g==",
+      "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/@testing-library/user-event": {
+      "version": "14.6.1",
+      "resolved": "https://registry.npmjs.org/@testing-library/user-event/-/user-event-14.6.1.tgz",
+      "integrity": "sha512-vq7fv0rnt+QTXgPxr5Hjc210p6YKq2kmdziLgnsZGgLJ9e6VAShx1pACLuRjd/AS/sr7phAR58OIIpf0LlmQNw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12",
+        "npm": ">=6"
+      },
+      "peerDependencies": {
+        "@testing-library/dom": ">=7.21.4"
+      }
+    },
+    "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/babel__core": {
       "version": "7.20.5",
       "resolved": "https://registry.npmjs.org/@types/babel__core/-/babel__core-7.20.5.tgz",
@@ -4847,6 +5179,119 @@
         "vite": "^4.2.0 || ^5.0.0 || ^6.0.0 || ^7.0.0"
       }
     },
+    "node_modules/@vitest/expect": {
+      "version": "2.1.9",
+      "resolved": "https://registry.npmjs.org/@vitest/expect/-/expect-2.1.9.tgz",
+      "integrity": "sha512-UJCIkTBenHeKT1TTlKMJWy1laZewsRIzYighyYiJKZreqtdxSos/S1t+ktRMQWu2CKqaarrkeszJx1cgC5tGZw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
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+      "license": "MIT",
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
+    "node_modules/tinyspy": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/tinyspy/-/tinyspy-3.0.2.tgz",
+      "integrity": "sha512-n1cw8k1k0x4pgA2+9XrOkFydTerNcJ1zWCO5Nn9scWHTD+5tp8dghT2x1uduQePZTZgd3Tupf+x9BxJjeJi77Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
+    "node_modules/tldts": {
+      "version": "7.0.30",
+      "resolved": "https://registry.npmjs.org/tldts/-/tldts-7.0.30.tgz",
+      "integrity": "sha512-ELrFxuqsDdHUwoh0XxDbxuLD3Wnz49Z57IFvTtvWy1hJdcMZjXLIuonjilCiWHlT2GbE4Wlv1wKVTzDFnXH1aw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "tldts-core": "^7.0.30"
+      },
+      "bin": {
+        "tldts": "bin/cli.js"
+      }
+    },
+    "node_modules/tldts-core": {
+      "version": "7.0.30",
+      "resolved": "https://registry.npmjs.org/tldts-core/-/tldts-core-7.0.30.tgz",
+      "integrity": "sha512-uiHN8PIB1VmWyS98eZYja4xzlYqeFZVjb4OuYlJQnZAuJhMw4PbKQOKgHKhBdJR3FE/t5mUQ1Kd80++B+qhD1Q==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/to-buffer": {
       "version": "1.2.2",
       "resolved": "https://registry.npmjs.org/to-buffer/-/to-buffer-1.2.2.tgz",
@@ -9981,6 +11025,19 @@
         "node": ">=8.0"
       }
     },
+    "node_modules/tough-cookie": {
+      "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": {
+        "tldts": "^7.0.5"
+      },
+      "engines": {
+        "node": ">=16"
+      }
+    },
     "node_modules/tr46": {
       "version": "0.0.3",
       "resolved": "https://registry.npmjs.org/tr46/-/tr46-0.0.3.tgz",
@@ -10100,6 +11157,16 @@
       "integrity": "sha512-Ql87qFHB3s/De2ClA9e0gsnS6zXG27SkTiSJwjCc9MebbfapQfuPzumMIUMi38ezPZVNFcHI9sUIepeQfw8J8Q==",
       "license": "MIT"
     },
+    "node_modules/undici": {
+      "version": "7.25.0",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-7.25.0.tgz",
+      "integrity": "sha512-xXnp4kTyor2Zq+J1FfPI6Eq3ew5h6Vl0F/8d9XU5zZQf1tX9s2Su1/3PiMmUANFULpmksxkClamIZcaUqryHsQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.18.1"
+      }
+    },
     "node_modules/undici-types": {
       "version": "7.25.0",
       "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.25.0.tgz",
@@ -10356,6 +11423,108 @@
         }
       }
     },
+    "node_modules/vite-node": {
+      "version": "2.1.9",
+      "resolved": "https://registry.npmjs.org/vite-node/-/vite-node-2.1.9.tgz",
+      "integrity": "sha512-AM9aQ/IPrW/6ENLQg3AGY4K1N2TGZdR5e4gu/MmmR2xR3Ll1+dib+nook92g4TV3PXVyeyxdWwtaCAiUL0hMxA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "cac": "^6.7.14",
+        "debug": "^4.3.7",
+        "es-module-lexer": "^1.5.4",
+        "pathe": "^1.1.2",
+        "vite": "^5.0.0"
+      },
+      "bin": {
+        "vite-node": "vite-node.mjs"
+      },
+      "engines": {
+        "node": "^18.0.0 || >=20.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      }
+    },
+    "node_modules/vitest": {
+      "version": "2.1.9",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-2.1.9.tgz",
+      "integrity": "sha512-MSmPM9REYqDGBI8439mA4mWhV5sKmDlBKWIYbA3lRb2PTHACE0mgKwA8yQ2xq9vxDTuk4iPrECBAEW2aoFXY0Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@vitest/expect": "2.1.9",
+        "@vitest/mocker": "2.1.9",
+        "@vitest/pretty-format": "^2.1.9",
+        "@vitest/runner": "2.1.9",
+        "@vitest/snapshot": "2.1.9",
+        "@vitest/spy": "2.1.9",
+        "@vitest/utils": "2.1.9",
+        "chai": "^5.1.2",
+        "debug": "^4.3.7",
+        "expect-type": "^1.1.0",
+        "magic-string": "^0.30.12",
+        "pathe": "^1.1.2",
+        "std-env": "^3.8.0",
+        "tinybench": "^2.9.0",
+        "tinyexec": "^0.3.1",
+        "tinypool": "^1.0.1",
+        "tinyrainbow": "^1.2.0",
+        "vite": "^5.0.0",
+        "vite-node": "2.1.9",
+        "why-is-node-running": "^2.3.0"
+      },
+      "bin": {
+        "vitest": "vitest.mjs"
+      },
+      "engines": {
+        "node": "^18.0.0 || >=20.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@types/node": "^18.0.0 || >=20.0.0",
+        "@vitest/browser": "2.1.9",
+        "@vitest/ui": "2.1.9",
+        "happy-dom": "*",
+        "jsdom": "*"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        }
+      }
+    },
+    "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/wagmi": {
       "version": "2.19.5",
       "resolved": "https://registry.npmjs.org/wagmi/-/wagmi-2.19.5.tgz",
@@ -10393,6 +11562,16 @@
       "integrity": "sha512-2JAn3z8AR6rjK8Sm8orRC0h/bcl/DqL7tRPdGZ4I1CjdF+EaMLmYxBHyXuKL849eucPFhvBoxMsflfOb8kxaeQ==",
       "license": "BSD-2-Clause"
     },
+    "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": "5.0.0",
       "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",
@@ -10430,6 +11609,23 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "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/wrap-ansi": {
       "version": "6.2.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-6.2.0.tgz",
@@ -10471,6 +11667,23 @@
         }
       }
     },
+    "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/xmlhttprequest-ssl": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/xmlhttprequest-ssl/-/xmlhttprequest-ssl-2.1.2.tgz",
diff --git a/package.json b/package.json
index 3a944b0..549693e 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,9 @@
     "build": "vite build",
     "preview": "vite preview",
     "format": "prettier --write \"src/**/*.{ts,tsx,css}\" \"*.{js,ts,json,html}\"",
-    "format:check": "prettier --check \"src/**/*.{ts,tsx,css}\" \"*.{js,ts,json,html}\""
+    "format:check": "prettier --check \"src/**/*.{ts,tsx,css}\" \"*.{js,ts,json,html}\"",
+    "test": "vitest run",
+    "test:watch": "vitest"
   },
   "dependencies": {
     "@rainbow-me/rainbowkit": "^2.2.11",
@@ -21,14 +23,19 @@
     "wagmi": "^2.19.5"
   },
   "devDependencies": {
+    "@testing-library/jest-dom": "^6.9.1",
+    "@testing-library/react": "^16.3.2",
+    "@testing-library/user-event": "^14.6.1",
     "@types/react": "^18.3.12",
     "@types/react-dom": "^18.3.1",
     "@vitejs/plugin-react": "^4.3.3",
     "autoprefixer": "^10.4.20",
+    "jsdom": "^29.1.1",
     "postcss": "^8.4.47",
     "prettier": "^3.8.3",
     "tailwindcss": "^3.4.14",
     "typescript": "^5.6.3",
-    "vite": "^5.4.10"
+    "vite": "^5.4.10",
+    "vitest": "^2.1.9"
   }
 }
diff --git a/src/api.test.ts b/src/api.test.ts
new file mode 100644
index 0000000..5a32909
--- /dev/null
+++ b/src/api.test.ts
@@ -0,0 +1,71 @@
+import { describe, expect, it, vi } from "vitest";
+
+async function loadApi(apiUrl = "") {
+  vi.resetModules();
+  vi.stubEnv("VITE_API_URL", apiUrl);
+  return import("./api");
+}
+
+function jsonResponse(body: unknown, init?: ResponseInit) {
+  return new Response(JSON.stringify(body), {
+    status: 200,
+    headers: { "Content-Type": "application/json" },
+    ...init,
+  });
+}
+
+describe("api helpers", () => {
+  it("normalizes nullish API arrays", async () => {
+    const { itemsOrEmpty } = await loadApi();
+
+    expect(itemsOrEmpty(null)).toEqual([]);
+    expect(itemsOrEmpty(undefined)).toEqual([]);
+    expect(itemsOrEmpty(["a"])).toEqual(["a"]);
+  });
+
+  it("builds asset URLs from API base while preserving absolute URLs", async () => {
+    const { assetUrl } = await loadApi("https://api.example.com");
+
+    expect(assetUrl("/uploads/file.png")).toBe(
+      "https://api.example.com/uploads/file.png",
+    );
+    expect(assetUrl("https://cdn.example.com/file.png")).toBe(
+      "https://cdn.example.com/file.png",
+    );
+    expect(assetUrl(undefined)).toBe("");
+  });
+
+  it("fetches JSON with API base and throws response text on failure", async () => {
+    const { getJSON } = await loadApi("https://api.example.com");
+    const fetchMock = vi
+      .fn()
+      .mockResolvedValueOnce(jsonResponse({ ok: true }))
+      .mockResolvedValueOnce(new Response("boom", { status: 500 }));
+    vi.stubGlobal("fetch", fetchMock);
+
+    await expect(getJSON("/api/resources")).resolves.toEqual({ ok: true });
+    expect(fetchMock).toHaveBeenCalledWith(
+      "https://api.example.com/api/resources",
+    );
+    await expect(getJSON("/api/fail")).rejects.toThrow("boom");
+  });
+
+  it("posts JSON with optional bearer token", async () => {
+    const { postJSON } = await loadApi();
+    const fetchMock = vi.fn().mockResolvedValue(jsonResponse({ id: 1 }));
+    vi.stubGlobal("fetch", fetchMock);
+
+    await expect(
+      postJSON("/api/admin/resources", { title: "Demo" }, "token-123"),
+    ).resolves.toEqual({ id: 1 });
+
+    expect(fetchMock).toHaveBeenCalledWith("/api/admin/resources", {
+      method: "POST",
+      headers: {
+        "Content-Type": "application/json",
+        Authorization: "Bearer token-123",
+      },
+      body: JSON.stringify({ title: "Demo" }),
+    });
+  });
+});
diff --git a/src/components/ResourceCard.test.tsx b/src/components/ResourceCard.test.tsx
new file mode 100644
index 0000000..e666bfa
--- /dev/null
+++ b/src/components/ResourceCard.test.tsx
@@ -0,0 +1,100 @@
+import { render, screen } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { MemoryRouter } from "react-router-dom";
+import { describe, expect, it, vi } from "vitest";
+import type { Resource } from "../api";
+import { I18nProvider } from "../i18n";
+import { ResourceCard } from "./ResourceCard";
+
+const resource: Resource = {
+  id: "resource-1",
+  title: "Demo Resource",
+  description: "Short description",
+  type: "pdf",
+  language: "zh-TW",
+  categoryId: 1,
+  categorySlug: "docs",
+  categoryName: "文件",
+  coverImage: "/uploads/cover.png",
+  fileUrl: "/uploads/demo.pdf",
+  previewUrl: "/uploads/preview.pdf",
+  badgeLabel: "官方",
+  isDownloadable: true,
+  isRecommended: true,
+  updatedAt: "2026-05-16T00:00:00Z",
+  tags: ["ark"],
+};
+
+function renderCard(onFavoriteToggle = vi.fn()) {
+  return {
+    user: userEvent.setup(),
+    onFavoriteToggle,
+    ...render(
+      <MemoryRouter>
+        <I18nProvider>
+          <ResourceCard r={resource} onFavoriteToggle={onFavoriteToggle} />
+        </I18nProvider>
+      </MemoryRouter>,
+    ),
+  };
+}
+
+function okResponse() {
+  return new Response(JSON.stringify({}), {
+    status: 200,
+    headers: { "Content-Type": "application/json" },
+  });
+}
+
+describe("ResourceCard", () => {
+  it("renders resource summary and detail link", () => {
+    renderCard();
+
+    expect(screen.getByText("Demo Resource")).toBeInTheDocument();
+    expect(screen.getByText("文件")).toBeInTheDocument();
+    expect(screen.getByText("官方")).toBeInTheDocument();
+    expect(screen.getByRole("link", { name: /預覽/ })).toHaveAttribute(
+      "href",
+      "/resource/resource-1",
+    );
+  });
+
+  it("toggles local favorite state and syncs best-effort API delta", async () => {
+    const fetchMock = vi.fn().mockResolvedValue(okResponse());
+    vi.stubGlobal("fetch", fetchMock);
+    const { user, onFavoriteToggle } = renderCard();
+
+    await user.click(screen.getByRole("button", { name: /收藏/ }));
+
+    expect(JSON.parse(localStorage.getItem("ark_favorites") || "[]")).toEqual([
+      "resource-1",
+    ]);
+    expect(fetchMock).toHaveBeenCalledWith(
+      "/api/resources/resource-1/favorite",
+      expect.objectContaining({
+        method: "POST",
+        body: JSON.stringify({ add: true }),
+      }),
+    );
+    expect(onFavoriteToggle).toHaveBeenCalledTimes(1);
+  });
+
+  it("tracks downloads then opens the downloadable file", async () => {
+    const fetchMock = vi.fn().mockResolvedValue(okResponse());
+    vi.stubGlobal("fetch", fetchMock);
+    const openMock = vi.spyOn(window, "open").mockImplementation(() => null);
+    const { user } = renderCard();
+
+    await user.click(screen.getByRole("button", { name: /下載/ }));
+
+    expect(fetchMock).toHaveBeenCalledWith(
+      "/api/resources/resource-1/download",
+      expect.objectContaining({ method: "POST" }),
+    );
+    expect(openMock).toHaveBeenCalledWith(
+      "/uploads/demo.pdf",
+      "_blank",
+      "noopener,noreferrer",
+    );
+  });
+});
diff --git a/src/components/ResourceListFooter.test.tsx b/src/components/ResourceListFooter.test.tsx
new file mode 100644
index 0000000..f76c781
--- /dev/null
+++ b/src/components/ResourceListFooter.test.tsx
@@ -0,0 +1,52 @@
+import { fireEvent, render, screen } from "@testing-library/react";
+import { describe, expect, it, vi } from "vitest";
+import { ResourceListFooter } from "./ResourceListFooter";
+
+const t = (key: string) =>
+  ({
+    listRange: "顯示 {{from}}–{{to}}，共 {{total}} 筆",
+    paginationPrev: "上一頁",
+    paginationNext: "下一頁",
+    pageIndicator: "{{c}} / {{p}} 頁",
+  })[key] ?? key;
+
+describe("ResourceListFooter", () => {
+  it("renders range, page count, and disabled prev on first page", () => {
+    render(
+      <ResourceListFooter
+        page={1}
+        limit={24}
+        total={50}
+        t={t}
+        onPrev={vi.fn()}
+        onNext={vi.fn()}
+      />,
+    );
+
+    expect(screen.getByText("顯示 1–24，共 50 筆")).toBeInTheDocument();
+    expect(screen.getByText("1 / 3 頁")).toBeInTheDocument();
+    expect(screen.getByRole("button", { name: "上一頁" })).toBeDisabled();
+    expect(screen.getByRole("button", { name: "下一頁" })).toBeEnabled();
+  });
+
+  it("calls navigation handlers when buttons are enabled", () => {
+    const onPrev = vi.fn();
+    const onNext = vi.fn();
+    render(
+      <ResourceListFooter
+        page={2}
+        limit={24}
+        total={50}
+        t={t}
+        onPrev={onPrev}
+        onNext={onNext}
+      />,
+    );
+
+    fireEvent.click(screen.getByRole("button", { name: "上一頁" }));
+    fireEvent.click(screen.getByRole("button", { name: "下一頁" }));
+
+    expect(onPrev).toHaveBeenCalledTimes(1);
+    expect(onNext).toHaveBeenCalledTimes(1);
+  });
+});
diff --git a/src/favorites.test.ts b/src/favorites.test.ts
new file mode 100644
index 0000000..872c29a
--- /dev/null
+++ b/src/favorites.test.ts
@@ -0,0 +1,27 @@
+import { describe, expect, it } from "vitest";
+import { isFavorite, readFavorites, toggleFavorite } from "./favorites";
+
+describe("favorites localStorage helpers", () => {
+  it("returns an empty list for missing, invalid, or non-array values", () => {
+    expect(readFavorites()).toEqual([]);
+
+    localStorage.setItem("ark_favorites", "not-json");
+    expect(readFavorites()).toEqual([]);
+
+    localStorage.setItem("ark_favorites", JSON.stringify({ id: "r1" }));
+    expect(readFavorites()).toEqual([]);
+  });
+
+  it("filters non-string entries and toggles favorite ids", () => {
+    localStorage.setItem("ark_favorites", JSON.stringify(["r1", 123, "r2"]));
+    expect(readFavorites()).toEqual(["r1", "r2"]);
+
+    expect(toggleFavorite("r3")).toBe(true);
+    expect(isFavorite("r3")).toBe(true);
+    expect(readFavorites()).toEqual(["r1", "r2", "r3"]);
+
+    expect(toggleFavorite("r1")).toBe(false);
+    expect(isFavorite("r1")).toBe(false);
+    expect(readFavorites()).toEqual(["r2", "r3"]);
+  });
+});
diff --git a/src/resourceTypeLabels.test.ts b/src/resourceTypeLabels.test.ts
new file mode 100644
index 0000000..3931bee
--- /dev/null
+++ b/src/resourceTypeLabels.test.ts
@@ -0,0 +1,33 @@
+import { describe, expect, it } from "vitest";
+import {
+  resourceLanguageLabel,
+  resourceTypeDisplay,
+  resourceTypeLabel,
+  typeFilterLabel,
+} from "./resourceTypeLabels";
+
+const t = (key: string) =>
+  ({
+    filterAll: "全部",
+    type_image: "圖片",
+    type_video: "影片",
+    lang_zh_TW: "繁中",
+    lang_zh_CN: "簡中",
+    lang_en: "英文",
+  })[key] ?? key;
+
+describe("resource labels", () => {
+  it("localizes known resource types and falls back to raw type", () => {
+    expect(typeFilterLabel(t, "all")).toBe("全部");
+    expect(resourceTypeLabel(t, "image")).toBe("圖片");
+    expect(resourceTypeDisplay(t, "video")).toBe("影片");
+    expect(resourceTypeLabel(t, "unknown")).toBe("unknown");
+  });
+
+  it("normalizes resource language codes", () => {
+    expect(resourceLanguageLabel(t, "zh-TW")).toBe("繁中");
+    expect(resourceLanguageLabel(t, "zh-hans")).toBe("簡中");
+    expect(resourceLanguageLabel(t, "EN")).toBe("英文");
+    expect(resourceLanguageLabel(t, "ja")).toBe("ja");
+  });
+});
diff --git a/src/test/setup.ts b/src/test/setup.ts
new file mode 100644
index 0000000..03484c8
--- /dev/null
+++ b/src/test/setup.ts
@@ -0,0 +1,49 @@
+import "@testing-library/jest-dom/vitest";
+import { afterEach, beforeEach, vi } from "vitest";
+import { cleanup } from "@testing-library/react";
+
+function createLocalStorageMock(): Storage {
+  let store: Record<string, string> = {};
+  return {
+    get length() {
+      return Object.keys(store).length;
+    },
+    clear() {
+      store = {};
+    },
+    getItem(key: string) {
+      return Object.prototype.hasOwnProperty.call(store, key)
+        ? store[key]
+        : null;
+    },
+    key(index: number) {
+      return Object.keys(store)[index] ?? null;
+    },
+    removeItem(key: string) {
+      delete store[key];
+    },
+    setItem(key: string, value: string) {
+      store[key] = String(value);
+    },
+  };
+}
+
+beforeEach(() => {
+  const storage = createLocalStorageMock();
+  Object.defineProperty(globalThis, "localStorage", {
+    value: storage,
+    configurable: true,
+  });
+  Object.defineProperty(window, "localStorage", {
+    value: storage,
+    configurable: true,
+  });
+});
+
+afterEach(() => {
+  cleanup();
+  globalThis.localStorage.clear();
+  vi.restoreAllMocks();
+  vi.unstubAllGlobals();
+  vi.unstubAllEnvs();
+});
diff --git a/src/utils/categoryDisplay.test.ts b/src/utils/categoryDisplay.test.ts
new file mode 100644
index 0000000..71bc226
--- /dev/null
+++ b/src/utils/categoryDisplay.test.ts
@@ -0,0 +1,23 @@
+import { describe, expect, it } from "vitest";
+import { categoryCardLines } from "./categoryDisplay";
+
+describe("categoryCardLines", () => {
+  it("splits Chinese and ASCII parenthetical subtitles", () => {
+    expect(categoryCardLines("官方公告（繁中）")).toEqual({
+      line1: "官方公告",
+      line2: "（繁中）",
+    });
+    expect(categoryCardLines("Tutorials (EN)")).toEqual({
+      line1: "Tutorials",
+      line2: "(EN)",
+    });
+  });
+
+  it("uses trimmed description as subtitle when name has no parentheses", () => {
+    expect(categoryCardLines("影片", " 官方教學 ")).toEqual({
+      line1: "影片",
+      line2: "官方教學",
+    });
+    expect(categoryCardLines("文件")).toEqual({ line1: "文件" });
+  });
+});
diff --git a/src/video.test.ts b/src/video.test.ts
new file mode 100644
index 0000000..1bba600
--- /dev/null
+++ b/src/video.test.ts
@@ -0,0 +1,11 @@
+import { describe, expect, it } from "vitest";
+import { isLikelyVideoPath } from "./video";
+
+describe("isLikelyVideoPath", () => {
+  it("detects common video extensions and ignores query strings", () => {
+    expect(isLikelyVideoPath("/uploads/intro.MP4?token=1")).toBe(true);
+    expect(isLikelyVideoPath("https://cdn.example.com/demo.webm")).toBe(true);
+    expect(isLikelyVideoPath("/uploads/file.pdf")).toBe(false);
+    expect(isLikelyVideoPath(undefined)).toBe(false);
+  });
+});
diff --git a/vitest.config.ts b/vitest.config.ts
new file mode 100644
index 0000000..74e6fea
--- /dev/null
+++ b/vitest.config.ts
@@ -0,0 +1,16 @@
+import { defineConfig } from "vitest/config";
+import react from "@vitejs/plugin-react";
+
+export default defineConfig({
+  plugins: [react()],
+  test: {
+    environment: "jsdom",
+    environmentOptions: {
+      jsdom: {
+        url: "http://localhost/",
+      },
+    },
+    setupFiles: "./src/test/setup.ts",
+    css: false,
+  },
+});