test: Introduces Vitest for unit tests

Signed-off-by: Tyler Smalley <tyler@tailscale.com>

.github/workflows/test.yml

@@ -26,6 +26,8 @@ jobs:
           key: yarn-cache
       - name: Install dependencies
         run: tool/yarn install --frozen-lockfile --prefer-offline
+      - name: Unit tests
+        run: tool/yarn test
       - name: Lint
         run: tool/yarn lint
       - name: Typescript

.vscode/launch.json

@@ -15,6 +15,17 @@
       },
       "outFiles": ["${workspaceFolder}/dist/**/*.js"],
       "preLaunchTask": "${defaultBuildTask}"
+    },
+    {
+      "type": "node",
+      "request": "launch",
+      "name": "Debug Current Test File",
+      "autoAttachChildProcesses": true,
+      "skipFiles": ["<node_internals>/**", "**/node_modules/**"],
+      "program": "${workspaceRoot}/node_modules/vitest/vitest.mjs",
+      "args": ["run", "${relativeFile}"],
+      "smartStep": true,
+      "console": "integratedTerminal"
     }
   ]
 }

package.json

@@ -314,6 +314,7 @@
     "package": "vsce package --allow-star-activation",
     "precommit": "lint-staged",
     "prepare": "husky install",
+    "test": "vitest",
     "vscode:prepublish": "(yarn run bundle-js & pid1=$!; yarn run bundle-go & pid2=$!; wait $pid1 || exit 1; wait $pid2 || exit 1)",
     "watch": "webpack serve"
   },
@@ -351,6 +352,7 @@
     "ts-loader": "^9.4.4",
     "typescript": "^5.1.6",
     "utf-8-validate": "^6.0.3",
+    "vitest": "^.33.0",
     "vscode-jsonrpc": "^8.1.0",
     "webpack": "^5.88.2",
     "webpack-cli": "^5.1.4",

vitest.config.ts

@@ -0,0 +1,7 @@
+import { configDefaults, defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    exclude: [...configDefaults.exclude, '**/out/**'],
+  },
+});