add more meaningful api tests

extensions/vscode-api-tests/src/editor.test.ts

@@ -0,0 +1,39 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+'use strict';
+
+import * as assert from 'assert';
+import * as fs from 'fs';
+import * as os from 'os';
+import {workspace, window, Position} from 'vscode';
+import {createRandomFile, deleteFile} from './utils';
+import {join} from 'path';
+
+suite("editor tests", () => {
+
+	test('make edit', (done) => {
+		createRandomFile().then(file => {
+			return workspace.openTextDocument(file).then(doc => {
+				return window.showTextDocument(doc).then((editor) => {
+					return editor.edit((builder) => {
+						builder.insert(new Position(0, 0), 'Hello World');
+					}).then(applied => {
+						assert.ok(applied);
+						assert.equal(doc.getText(), 'Hello World');
+						assert.ok(doc.isDirty);
+
+						return doc.save().then(saved => {
+							assert.ok(saved);
+							assert.ok(!doc.isDirty);
+
+							return deleteFile(file);
+						});
+					});
+				});
+			});
+		}).then(() => done(), (error) => done(error));
+	});
+});