Add tests for incrementFileName

src/vs/workbench/parts/files/electron-browser/fileActions.ts

@@ -1058,7 +1058,7 @@ function findValidPasteFileTarget(targetFolder: ExplorerItem, fileToPaste: { res
 	return candidate;
 }
 
-function incrementFileName(name: string, isFolder: boolean): string {
+export function incrementFileName(name: string, isFolder: boolean): string {
 
 	// file.1.txt=>file.2.txt
 	if (!isFolder && name.match(/(.*\.)(\d+)(\..*)$/)) {

src/vs/workbench/parts/files/test/electron-browser/fileActions.test.ts

+/*---------------------------------------------------------------------------------------------
+ *  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 { incrementFileName } from 'vs/workbench/parts/files/electron-browser/fileActions';
+
+suite('Files - Increment file name', () => {
+
+	test('Increment file name without any version', function () {
+		const name = 'test.js';
+		const result = incrementFileName(name, false);
+		assert.strictEqual(result, 'test.1.js');
+	});
+
+	test('Increment folder name without any version', function () {
+		const name = 'test';
+		const result = incrementFileName(name, true);
+		assert.strictEqual(result, 'test.1');
+	});
+
+	test('Increment file name with suffix version', function () {
+		const name = 'test.1.js';
+		const result = incrementFileName(name, false);
+		assert.strictEqual(result, 'test.2.js');
+	});
+
+	test('Increment folder name with suffix version', function () {
+		const name = 'test.1';
+		const result = incrementFileName(name, true);
+		assert.strictEqual(result, 'test.2');
+	});
+
+	test('Increment file name with prefix version', function () {
+		const name = '1.test.js';
+		const result = incrementFileName(name, false);
+		assert.strictEqual(result, '2.test.js');
+	});
+
+	test('Increment folder name with suffix version', function () {
+		const name = '1.test';
+		const result = incrementFileName(name, true);
+		assert.strictEqual(result, '2.test');
+	});
+
+});
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