Start adding some basic document link pinning tests

extensions/markdown-language-features/src/test/documentLinkProvider.test.ts

@@ -0,0 +1,46 @@
+/*---------------------------------------------------------------------------------------------
+ *  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 LinkProvider from '../features/documentLinkProvider';
+import { InMemoryDocument } from './inMemoryDocument';
+
+
+const testFileName = vscode.Uri.parse('test.md');
+
+const noopToken = new class implements vscode.CancellationToken {
+	private _onCancellationRequestedEmitter = new vscode.EventEmitter<void>();
+	public onCancellationRequested = this._onCancellationRequestedEmitter.event;
+
+	get isCancellationRequested() { return false; }
+};
+
+function getLinksForFile(fileContents: string) {
+	const doc = new InMemoryDocument(testFileName, fileContents);
+	const provider = new LinkProvider();
+	return provider.provideDocumentLinks(doc, noopToken);
+}
+
+
+suite('markdown.DocumentLinkProvider', () => {
+	test('Should not return anything for empty document', async () => {
+		const links = getLinksForFile('');
+		assert.strictEqual(links.length, 0);
+	});
+
+	test('Should not return anything for simple document without links', async () => {
+		const links = getLinksForFile('# a\nfdasfdfsafsa');
+		assert.strictEqual(links.length, 0);
+	});
+
+	test('Should should detect basic http link', async () => {
+		const links = getLinksForFile('a [b](https://example.com) c');
+		assert.strictEqual(links.length, 1);
+	});
+});
+
+