Added ability to run single VSCode functional test. (#1562)

- In VSCode only (F5) you are now prompted with a test file filter that will be applied to the entire list of functional tests.
- This does not impact command line runs.

dotnet/aspnetcore#17045

.vscode/launch.json

@@ -62,15 +62,18 @@
       "preLaunchTask": "CompileGrammarTests"
     },
     {
-      "name": "Run Functional Tests",
+      "name": "Run Functional Test",
       "type": "extensionHost",
       "request": "launch",
       "runtimeExecutable": "${execPath}",
       "args": [
         "${workspaceFolder}/src/Razor/test/testapps/",
         "--extensionDevelopmentPath=${workspaceFolder}/src/Razor/src/Microsoft.AspNetCore.Razor.VSCode.Extension",
-        "--extensionTestsPath=${workspaceFolder}/src/Razor/test/Microsoft.AspNetCore.Razor.VSCode.FunctionalTest/dist/index",
+        "--extensionTestsPath=${workspaceFolder}/src/Razor/test/Microsoft.AspNetCore.Razor.VSCode.FunctionalTest/dist/index"
       ],
+      "env": {
+        "runSingleTest": "true"
+      },
       "outFiles": [
         "${workspaceFolder}/src/Razor/test/Microsoft.AspNetCore.Razor.VSCode.FunctionalTest/dist/**/*.js",
       ],

src/Razor/test/Microsoft.AspNetCore.Razor.VSCode.FunctionalTest/tests/index.ts

@@ -26,8 +26,22 @@ export async function run(): Promise<void> {
         await vscode.commands.executeCommand('extension.configureRazorDevMode');
     }
 
+    let testFilter: string | undefined;
+    if (process.env.runSingleTest === 'true') {
+        testFilter = await vscode.window.showInputBox({
+                prompt: 'Test file filter',
+                placeHolder: '**.test.js',
+            });
+    }
+
+    if (!testFilter) {
+        testFilter = '**.test.js';
+    } else if (!testFilter.endsWith('.test.js')) {
+        testFilter += '**.test.js';
+    }
+
     return new Promise((c, e) => {
-        glob('**/**.test.js', { cwd: testsRoot }, (err, files) => {
+        glob(`**/${testFilter}`, { cwd: testsRoot }, (err, files) => {
             if (err) {
                 return e(err);
             }