feat(tests): add watch mode for Vitest and enhance test configurations

This update introduces a new `test:watch` command in the root and individual package configurations, allowing for easier test development. Additionally, the Vitest configuration file is added to support running tests across multiple projects in the monorepo. The test commands in the `todo-app`, `ui`, and `utils` packages are updated to use `vitest run` with options for handling empty test suites.

Author: jaruesink

apps/todo-app/package.json

@@ -17,7 +17,8 @@
     "typecheck": "tsc --noEmit",
     "lint": "biome lint .",
     "format": "biome format --write .",
-    "test": "vitest",
+    "test": "vitest run",
+    "test:watch": "vitest",
     "test:ui": "vitest --ui",
     "test:run": "vitest run",
     "test:ci": "vitest run"

package.json

@@ -12,6 +12,7 @@
     "typecheck": "bun run turbo run typecheck",
     "biome-fix": "bun run biome check --fix",
     "test": "bun run turbo run test",
+    "test:watch": "bun run turbo run test:watch",
     "test:ci": "bun run turbo run test:ci"
   },
   "dependencies": {

packages/ui/package.json

@@ -16,7 +16,8 @@
     "lint": "biome lint .",
     "format": "biome format --write .",
     "typecheck": "tsc --noEmit",
-    "test": "vitest",
+    "test": "vitest run --passWithNoTests",
+    "test:watch": "vitest",
     "test:ci": "vitest run --passWithNoTests"
   },
   "devDependencies": {

packages/utils/package.json

@@ -16,7 +16,8 @@
     "lint": "biome lint .",
     "format": "biome format --write .",
     "typecheck": "tsc --noEmit",
-    "test": "vitest",
+    "test": "vitest run --passWithNoTests",
+    "test:watch": "vitest",
     "test:ci": "vitest run --passWithNoTests"
   },
   "devDependencies": {

turbo.json

@@ -29,11 +29,18 @@
     },
     "test": {
       "dependsOn": ["^build"],
-      "inputs": ["$TURBO_DEFAULT$", ".env*"],
+      "inputs": ["$TURBO_DEFAULT$", ".env*", "vitest.config.*"],
       "outputs": []
     },
+    "test:watch": {
+      "dependsOn": ["^build"],
+      "inputs": ["$TURBO_DEFAULT$", ".env*", "vitest.config.*"],
+      "outputs": [],
+      "cache": false,
+      "persistent": true
+    },
     "test:ci": {
-      "inputs": ["$TURBO_DEFAULT$", ".env*"],
+      "inputs": ["$TURBO_DEFAULT$", ".env*", "vitest.config.*"],
       "outputs": []
     }
   }

vitest.config.ts

@@ -0,0 +1,12 @@
+import { defineConfig } from 'vitest/config';
+
+// Root Vitest configuration for monorepo
+// This enables running tests from the root with proper workspace support
+export default defineConfig({
+  test: {
+    projects: [
+      'apps/*/vitest.config.{ts,js}',
+      'packages/*/vitest.config.{ts,js}',
+    ],
+  },
+});