fix: add explicit user-data-dir to ensure settings are read

The smoke/e2e/integration tests were failing because VS Code
wasn't reading the settings.json file we created. This happened
because @vscode/test-cli uses its own default user-data directory
unless we explicitly pass --user-data-dir.

This fix adds launchArgs to each test profile to point to our
.vscode-test/user-data directory where CI creates the settings file
with 'python.useEnvironmentsExtension': true.

Author: eleanorjboyd

.vscode-test.mjs

@@ -1,52 +1,65 @@
 import { defineConfig } from '@vscode/test-cli';
+import * as path from 'path';
+
+// Explicit user data directory - ensures VS Code reads our settings.json
+const userDataDir = path.resolve('.vscode-test/user-data');
 
 export default defineConfig([
-	{
-		label: 'smokeTests',
-		files: 'out/test/smoke/**/*.smoke.test.js',
-		mocha: {
-			ui: 'tdd',
-			timeout: 120000,
-			retries: 1,
-		},
-		env: {
-			VSC_PYTHON_SMOKE_TEST: '1',
-		},
-		// Install the Python extension - needed for venv support
-		installExtensions: ['ms-python.python'],
-	},
-	{
-		label: 'e2eTests',
-		files: 'out/test/e2e/**/*.e2e.test.js',
-		mocha: {
-			ui: 'tdd',
-			timeout: 180000,
-			retries: 1,
-		},
-		env: {
-			VSC_PYTHON_E2E_TEST: '1',
-		},
-		installExtensions: ['ms-python.python'],
-	},
-	{
-		label: 'integrationTests',
-		files: 'out/test/integration/**/*.integration.test.js',
-		mocha: {
-			ui: 'tdd',
-			timeout: 60000,
-			retries: 1,
-		},
-		env: {
-			VSC_PYTHON_INTEGRATION_TEST: '1',
-		},
-		installExtensions: ['ms-python.python'],
-	},
-	{
-		label: 'extensionTests',
-		files: 'out/test/**/*.test.js',
-		mocha: {
-			ui: 'tdd',
-			timeout: 60000,
-		},
-	},
+{
+label: 'smokeTests',
+files: 'out/test/smoke/**/*.smoke.test.js',
+mocha: {
+ui: 'tdd',
+timeout: 120000,
+retries: 1,
+},
+env: {
+VSC_PYTHON_SMOKE_TEST: '1',
+},
+launchArgs: [
+`--user-data-dir=${userDataDir}`,
+],
+// Install the Python extension - needed for venv support
+installExtensions: ['ms-python.python'],
+},
+{
+label: 'e2eTests',
+files: 'out/test/e2e/**/*.e2e.test.js',
+mocha: {
+ui: 'tdd',
+timeout: 180000,
+retries: 1,
+},
+env: {
+VSC_PYTHON_E2E_TEST: '1',
+},
+launchArgs: [
+`--user-data-dir=${userDataDir}`,
+],
+installExtensions: ['ms-python.python'],
+},
+{
+label: 'integrationTests',
+files: 'out/test/integration/**/*.integration.test.js',
+mocha: {
+ui: 'tdd',
+timeout: 60000,
+retries: 1,
+},
+env: {
+VSC_PYTHON_INTEGRATION_TEST: '1',
+},
+launchArgs: [
+`--user-data-dir=${userDataDir}`,
+],
+installExtensions: ['ms-python.python'],
+},
+{
+label: 'extensionTests',
+files: 'out/test/**/*.test.js',
+mocha: {
+ui: 'tdd',
+timeout: 60000,
+},
+},
 ]);