diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 2bf45f2..a097490 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -13,15 +13,269 @@
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+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
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+          "url": "https://opencollective.com/csstools"
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+      "license": "MIT-0",
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+    "node_modules/@csstools/css-tokenizer": {
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+      "resolved": "https://registry.npmjs.org/@csstools/css-tokenizer/-/css-tokenizer-4.0.0.tgz",
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+      ],
+      "license": "MIT",
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       }
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     "node_modules/@emnapi/core": {
@@ -58,6 +312,111 @@
         "tslib": "^2.4.0"
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+      "license": "MIT",
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@@ -108,6 +467,31 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
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@@ -127,6 +511,31 @@
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@@ -724,6 +1133,13 @@
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@@ -996,6 +1412,96 @@
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+      "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": "16.0.1",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-16.0.1.tgz",
+      "integrity": "sha512-1to4zXBxmXHV3IiSSEInrreIlu02vUOvrhxJJH5vcxYTBDAx51cqZiKdyTxlecdKNSjj8EcxGBxNf6Vg+945gw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@exodus/bytes": "^1.11.0",
+        "tr46": "^6.0.0",
+        "webidl-conversions": "^8.0.1"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      }
+    },
+    "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": "7.0.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
+      "integrity": "sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^4.0.0",
+        "string-width": "^4.1.0",
+        "strip-ansi": "^6.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
+      }
+    },
+    "node_modules/wrap-ansi/node_modules/ansi-styles": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
+      "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "color-convert": "^2.0.1"
+      },
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+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/xml-name-validator": {
+      "version": "5.0.0",
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+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
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+      }
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+      "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/yargs": {
+      "version": "17.7.3",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.3.tgz",
+      "integrity": "sha512-GZtjxm/J/4TSxuL3FNYjCmLktBTnIw/rVmKSIyKeYAZpmJB2ig9VauCC5xsa82GNKVKDAqpOn3KVzNt0zmrU0g==",
+      "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"
+      }
     }
   }
 }
diff --git a/frontend/package.json b/frontend/package.json
index a471f50..6590831 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -9,6 +9,8 @@
     "lint": "oxlint",
     "format": "prettier --write .",
     "format:check": "prettier --check .",
+    "test": "vitest run",
+    "test:watch": "vitest",
     "preview": "vite preview"
   },
   "dependencies": {
@@ -17,14 +19,20 @@
   },
   "devDependencies": {
     "@tailwindcss/vite": "^4.3.1",
+    "@testing-library/jest-dom": "^6.9.1",
+    "@testing-library/react": "^16.3.2",
+    "@testing-library/user-event": "^14.6.1",
     "@types/node": "^24.13.2",
     "@types/react": "^19.2.17",
     "@types/react-dom": "^19.2.3",
     "@vitejs/plugin-react": "^6.0.2",
+    "jsdom": "^29.1.1",
+    "msw": "^2.14.6",
     "oxlint": "^1.69.0",
     "prettier": "^3.9.1",
     "tailwindcss": "^4.3.1",
     "typescript": "~6.0.2",
-    "vite": "^8.1.0"
+    "vite": "^8.1.0",
+    "vitest": "^4.1.9"
   }
 }
diff --git a/frontend/src/components/ui/Button.test.tsx b/frontend/src/components/ui/Button.test.tsx
new file mode 100644
index 0000000..6f86990
--- /dev/null
+++ b/frontend/src/components/ui/Button.test.tsx
@@ -0,0 +1,13 @@
+import { render, screen } from '@testing-library/react'
+import { describe, expect, it } from 'vitest'
+import Button from './Button'
+
+describe('Button', () => {
+  it('renders its children as a button', () => {
+    render(<Button>Add Bucket</Button>)
+
+    expect(
+      screen.getByRole('button', { name: 'Add Bucket' }),
+    ).toBeInTheDocument()
+  })
+})
diff --git a/frontend/src/test/server.ts b/frontend/src/test/server.ts
new file mode 100644
index 0000000..fe95011
--- /dev/null
+++ b/frontend/src/test/server.ts
@@ -0,0 +1,7 @@
+import { setupServer } from 'msw/node'
+
+/**
+ * Shared MSW server for component/unit tests. Handlers are registered per-test
+ * via `server.use(...)`; the global setup resets them after each test.
+ */
+export const server = setupServer()
diff --git a/frontend/src/test/setup.ts b/frontend/src/test/setup.ts
new file mode 100644
index 0000000..b03682f
--- /dev/null
+++ b/frontend/src/test/setup.ts
@@ -0,0 +1,9 @@
+import '@testing-library/jest-dom/vitest'
+import { afterAll, afterEach, beforeAll } from 'vitest'
+import { server } from './server'
+
+// Start the MSW server before all tests, reset handlers between tests so
+// per-test overrides don't leak, and close it when the run finishes.
+beforeAll(() => server.listen({ onUnhandledRequest: 'error' }))
+afterEach(() => server.resetHandlers())
+afterAll(() => server.close())
diff --git a/frontend/vite.config.ts b/frontend/vite.config.ts
index 3a60a9d..09f362c 100644
--- a/frontend/vite.config.ts
+++ b/frontend/vite.config.ts
@@ -1,3 +1,4 @@
+/// <reference types="vitest/config" />
 import tailwindcss from '@tailwindcss/vite'
 import react from '@vitejs/plugin-react'
 import { defineConfig } from 'vite'
@@ -5,6 +6,16 @@ import { defineConfig } from 'vite'
 // https://vite.dev/config/
 export default defineConfig({
   plugins: [react(), tailwindcss()],
+  test: {
+    environment: 'jsdom',
+    // Give jsdom a real origin so the client's relative `/api/...` fetches
+    // resolve to an absolute URL MSW can intercept.
+    environmentOptions: { jsdom: { url: 'http://localhost' } },
+    globals: true,
+    setupFiles: ['./src/test/setup.ts'],
+    // Keep the future Playwright e2e suite out of the Vitest run.
+    exclude: ['**/node_modules/**', '**/dist/**', 'e2e/**'],
+  },
   server: {
     host: '0.0.0.0',
     port: 5173,