refactor(test): separate unit and integration tests

Rename 19 integration test files from *.test.ts to *.integration.test.ts.
Configure vitest projects to run them independently with separate coverage
thresholds. CI now reports unit and integration coverage as separate flags
to Codecov.

Unit tests: pure function calls, mocked dependencies, no DB
Integration tests: createTestApp() with in-memory DB + HTTP requests

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -24,11 +24,19 @@ jobs:
         run: npm ci
       - run: npm run lint
       - run: npm run typecheck
-      - run: npm test -- --coverage
+      - run: npx vitest run --project unit --coverage
       - uses: codecov/codecov-action@v5
         if: always()
         with:
           files: coverage/coverage-final.json
+          flags: unit
+          fail_ci_if_error: false
+      - run: npx vitest run --project integration --coverage
+      - uses: codecov/codecov-action@v5
+        if: always()
+        with:
+          files: coverage/coverage-final.json
+          flags: integration
           fail_ci_if_error: false
       - run: mkdir -p dist
       - run: npm run test:cf

vitest.config.ts

@@ -1,38 +1,67 @@
 import path from 'node:path'
 import { defineConfig } from 'vitest/config'
 
+const aliases = {
+  '@': path.resolve(__dirname, './src'),
+  '@shared': path.resolve(__dirname, './shared'),
+  '@server': path.resolve(__dirname, './server'),
+}
+
+const coverageConfig = {
+  provider: 'v8' as const,
+  include: ['server/**/*.ts', 'shared/**/*.ts', 'src/lib/**/*.ts', 'src/i18n/**/*.ts'],
+  exclude: [
+    'server/entry-*.ts',
+    'server/**/*.test.ts',
+    'server/**/*.integration.test.ts',
+    'server/**/*.cf-test.ts',
+    'server/test/**',
+    'server/platform/**',
+    'server/db/**',
+    'shared/**/*.test.ts',
+    'src/**/*.test.ts',
+    'src/i18n/index.ts',
+  ],
+  reporter: ['text', 'json'] as const,
+}
+
 export default defineConfig({
   test: {
     globals: true,
-    include: ['server/**/*.test.ts', 'shared/**/*.test.ts', 'src/**/*.test.ts'],
-    coverage: {
-      provider: 'v8',
-      include: ['server/**/*.ts', 'shared/**/*.ts', 'src/lib/**/*.ts', 'src/i18n/**/*.ts'],
-      exclude: [
-        'server/entry-*.ts',
-        'server/**/*.test.ts',
-        'server/**/*.cf-test.ts',
-        'server/test/**',
-        'server/platform/**',
-        'server/db/**',
-        'shared/**/*.test.ts',
-        'src/**/*.test.ts',
-        'src/i18n/index.ts',
-      ],
-      reporter: ['text', 'json'],
-      thresholds: {
-        statements: 90,
-        branches: 80,
-        functions: 90,
-        lines: 90,
+    projects: [
+      {
+        resolve: { alias: aliases },
+        test: {
+          name: 'unit',
+          include: ['server/**/*.test.ts', 'shared/**/*.test.ts', 'src/**/*.test.ts'],
+          exclude: ['**/*.integration.test.ts', '**/*.cf-test.ts'],
+          coverage: {
+            ...coverageConfig,
+            thresholds: {
+              statements: 50,
+              branches: 40,
+              functions: 50,
+              lines: 50,
+            },
+          },
+        },
       },
-    },
-  },
-  resolve: {
-    alias: {
-      '@': path.resolve(__dirname, './src'),
-      '@shared': path.resolve(__dirname, './shared'),
-      '@server': path.resolve(__dirname, './server'),
-    },
+      {
+        resolve: { alias: aliases },
+        test: {
+          name: 'integration',
+          include: ['server/**/*.integration.test.ts'],
+          coverage: {
+            ...coverageConfig,
+            thresholds: {
+              statements: 90,
+              branches: 80,
+              functions: 90,
+              lines: 90,
+            },
+          },
+        },
+      },
+    ],
   },
 })