diff --git a/extensions/vscode-api-tests/src/singlefolder-tests/workspace.test.ts b/extensions/vscode-api-tests/src/singlefolder-tests/workspace.test.ts
index d535935d5fa..a0c072998aa 100644
--- a/extensions/vscode-api-tests/src/singlefolder-tests/workspace.test.ts
+++ b/extensions/vscode-api-tests/src/singlefolder-tests/workspace.test.ts
@@ -981,7 +981,7 @@ suite('vscode API - workspace', () => {
 		assert.strictEqual(document.getText(), expected);
 	});
 
-	test('Should send a single FileWillRenameEvent instead of separate events when moving multiple files at once#111867', async function () {
+	test('Should send a single FileWillRenameEvent instead of separate events when moving multiple files at once#111867, 1/3', async function () {
 
 		const file1 = await createRandomFile();
 		const file2 = await createRandomFile();
@@ -1008,7 +1008,7 @@ suite('vscode API - workspace', () => {
 		assert.strictEqual(e.files[1].oldUri.toString(), file2.toString());
 	});
 
-	test('Should send a single FileWillRenameEvent instead of separate events when moving multiple files at once#111867', async function () {
+	test('Should send a single FileWillRenameEvent instead of separate events when moving multiple files at once#111867, 2/3', async function () {
 
 		const event = new Promise<vscode.FileWillCreateEvent>(resolve => {
 			let sub = vscode.workspace.onWillCreateFiles(e => {
@@ -1032,7 +1032,7 @@ suite('vscode API - workspace', () => {
 		assert.strictEqual(e.files[1].toString(), file2.toString());
 	});
 
-	test('Should send a single FileWillRenameEvent instead of separate events when moving multiple files at once#111867', async function () {
+	test('Should send a single FileWillRenameEvent instead of separate events when moving multiple files at once#111867, 3/3', async function () {
 
 		const file1 = await createRandomFile();
 		const file2 = await createRandomFile();
diff --git a/extensions/vscode-api-tests/src/utils.ts b/extensions/vscode-api-tests/src/utils.ts
index 7bf10716227..2c9e312fb87 100644
--- a/extensions/vscode-api-tests/src/utils.ts
+++ b/extensions/vscode-api-tests/src/utils.ts
@@ -4,11 +4,12 @@
  *--------------------------------------------------------------------------------------------*/
 
 import * as assert from 'assert';
+import * as crypto from 'crypto';
 import * as vscode from 'vscode';
 import { TestFS } from './memfs';
 
 export function rndName() {
-	return Math.random().toString(36).replace(/[^a-z]+/g, '').substr(0, 10);
+	return crypto.randomBytes(8).toString('hex');
 }
 
 export const testFs = new TestFS('fake-fs', true);