test: migrate extension smoke tests to vscode test cli

Author: georgewfraser

.gitignore

@@ -1,5 +1,6 @@
 /out
 /node_modules
+/.vscode-test
 /target
 /dist/classpath
 /dist/linux
@@ -17,4 +18,4 @@
 .idea
 *.iml
 *.vsix
-.DS_store
+.DS_store

.vscode-test.mjs

@@ -0,0 +1,15 @@
+import { defineConfig } from '@vscode/test-cli';
+
+export default defineConfig({
+    files: 'out/lib/test/**/*.test.js',
+    workspaceFolder: './src/test/examples/simple-project',
+    launchArgs: [
+        '--disable-gpu',
+        '--skip-welcome',
+        '--skip-release-notes',
+        '--disable-workspace-trust'
+    ],
+    mocha: {
+        timeout: 120000
+    }
+});

lib/test/smoke.test.ts

@@ -0,0 +1,50 @@
+'use strict';
+
+import * as assert from 'assert';
+import * as Path from 'path';
+import * as vscode from 'vscode';
+
+suite('Extension Smoke', () => {
+    test('activates and publishes diagnostics for Java files', async () => {
+        const extension = vscode.extensions.getExtension('georgewfraser.vscode-javac');
+        assert.ok(extension, 'Extension georgewfraser.vscode-javac was not found');
+
+        await extension.activate();
+
+        const commands = await vscode.commands.getCommands(true);
+        assert.ok(commands.includes('java.command.findReferences'), 'Expected Java commands to be registered');
+
+        const folders = vscode.workspace.workspaceFolders;
+        assert.ok(folders && folders.length > 0, 'Expected the smoke-test workspace to be open');
+
+        const uri = vscode.Uri.file(Path.join(folders[0].uri.fsPath, 'HelloError.java'));
+        const document = await vscode.workspace.openTextDocument(uri);
+        await vscode.window.showTextDocument(document);
+
+        const diagnostics = await waitForDiagnostics(uri, 90000);
+        const messages = diagnostics.map(d => d.message).join(' | ');
+
+        assert.ok(
+            diagnostics.some(d => d.severity === vscode.DiagnosticSeverity.Error),
+            `Expected an error diagnostic for HelloError.java, got: ${messages || '<none>'}`
+        );
+    });
+});
+
+async function waitForDiagnostics(uri: vscode.Uri, timeoutMs: number): Promise<vscode.Diagnostic[]> {
+    const start = Date.now();
+
+    while (Date.now() - start < timeoutMs) {
+        const diagnostics = vscode.languages.getDiagnostics(uri);
+        if (diagnostics.some(d => d.severity === vscode.DiagnosticSeverity.Error)) {
+            return diagnostics;
+        }
+        await delay(250);
+    }
+
+    return vscode.languages.getDiagnostics(uri);
+}
+
+function delay(ms: number): Promise<void> {
+    return new Promise(resolve => setTimeout(resolve, ms));
+}