Adding basic test for cached response

extensions/typescript-language-features/src/test/cachedResponse.test.ts

@@ -0,0 +1,59 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as assert from 'assert';
+import 'mocha';
+import * as vscode from 'vscode';
+import * as Proto from '../protocol';
+import { CachedResponse } from '../tsServer/cachedResponse';
+import { ServerResponse } from '../typescriptService';
+
+suite('CachedResponse', () => {
+	test('should cache simple response for same document', async () => {
+		const doc = await vscode.workspace.openTextDocument({ language: 'javascript', content: '' });
+		const response = new CachedResponse();
+
+		let seq = 0;
+		const makeRequest = async () => createSuccessResponse(`test-${seq++}`);
+
+		assertResult(await response.execute(doc, makeRequest), 'test-0');
+		assertResult(await response.execute(doc, makeRequest), 'test-0');
+	});
+
+	test('should invalidate cache for new document', async () => {
+		const doc1 = await vscode.workspace.openTextDocument({ language: 'javascript', content: '' });
+		const doc2 = await vscode.workspace.openTextDocument({ language: 'javascript', content: '' });
+		const response = new CachedResponse();
+
+		let seq = 0;
+		const makeRequest = async () => createSuccessResponse(`test-${seq++}`);
+
+		assertResult(await response.execute(doc1, makeRequest), 'test-0');
+		assertResult(await response.execute(doc1, makeRequest), 'test-0');
+		assertResult(await response.execute(doc2, makeRequest), 'test-1');
+		assertResult(await response.execute(doc2, makeRequest), 'test-1');
+		assertResult(await response.execute(doc1, makeRequest), 'test-2');
+		assertResult(await response.execute(doc1, makeRequest), 'test-2');
+	});
+});
+
+function assertResult(result: ServerResponse<Proto.Response>, command: string) {
+	if (result.type === 'response') {
+		assert.strictEqual(result.command, command);
+	} else {
+		assert.fail('Response failed');
+	}
+}
+
+function createSuccessResponse(command: string): Proto.Response {
+	return {
+		type: 'response',
+		body: {},
+		command: command,
+		request_seq: 1,
+		success: true,
+		seq: 1
+	};
+}