Add basic test for webview communication

565f971f · Matt Bierner · a529621b · 565f971f
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extensions/vscode-api-tests/src/singlefolder-tests/webview.test.ts ...s/vscode-api-tests/src/singlefolder-tests/webview.test.ts +50 -0

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--- a/extensions/vscode-api-tests/src/singlefolder-tests/webview.test.ts
+++ b/extensions/vscode-api-tests/src/singlefolder-tests/webview.test.ts
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import 'mocha';
+import * as assert from 'assert';
+import * as vscode from 'vscode';
+
+const webviewId = 'myWebview';
+
+suite('Webview tests', () => {
+
+	test('webview communication', async () => {
+		const webview = vscode.window.createWebviewPanel(webviewId, 'title', { viewColumn: vscode.ViewColumn.One }, { enableScripts: true });
+		webview.webview.html = createHtmlDocumentWithBody(/*html*/`
+			<script>
+				const vscode = acquireVsCodeApi();
+				window.addEventListener('message', (message) => {
+					vscode.postMessage({ value: message.data.value + 1 });
+				});
+			</script>`);
+
+		const p = new Promise<any>(resolve => {
+			webview.webview.onDidReceiveMessage(message => {
+				resolve(message);
+			});
+		});
+
+		webview.webview.postMessage({ value: 1 });
+		const response = await p;
+		assert.strictEqual(response.value, 2);
+	});
+});
+
+function createHtmlDocumentWithBody(body: string): string {
+	return /*html*/`<!DOCTYPE html>
+<html lang="en">
+<head>
+	<meta charset="UTF-8">
+	<meta name="viewport" content="width=device-width, initial-scale=1.0">
+	<meta http-equiv="X-UA-Compatible" content="ie=edge">
+	<title>Document</title>
+</head>
+<body>
+	${body}
+</body>
+</html>`;
+}
+