diff --git a/src/vs/workbench/contrib/notebook/test/notebookEditorModel.test.ts b/src/vs/workbench/contrib/notebook/test/notebookEditorModel.test.ts
new file mode 100644
index 00000000000..ea4b8103f36
--- /dev/null
+++ b/src/vs/workbench/contrib/notebook/test/notebookEditorModel.test.ts
@@ -0,0 +1,54 @@
+/*---------------------------------------------------------------------------------------------
+ *  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 { Event } from 'vs/base/common/event';
+import { Disposable } from 'vs/base/common/lifecycle';
+import { isEqual } from 'vs/base/common/resources';
+import { URI } from 'vs/base/common/uri';
+import { mock } from 'vs/base/test/common/mock';
+import { IFileService } from 'vs/platform/files/common/files';
+import { ILabelService } from 'vs/platform/label/common/label';
+import { NullLogService } from 'vs/platform/log/common/log';
+import { INotificationService } from 'vs/platform/notification/common/notification';
+import { NotebookEditorModel } from 'vs/workbench/contrib/notebook/common/notebookEditorModel';
+import { INotebookService } from 'vs/workbench/contrib/notebook/common/notebookService';
+import { IBackupFileService } from 'vs/workbench/services/backup/common/backup';
+import { IWorkingCopy, IWorkingCopyService } from 'vs/workbench/services/workingCopy/common/workingCopyService';
+
+suite('NotebookEditorModel', function () {
+
+	const notebokService = new class extends mock<INotebookService>() { };
+	const backupService = new class extends mock<IBackupFileService>() { };
+	const notificationService = new class extends mock<INotificationService>() { };
+	const fileService = new class extends mock<IFileService>() {
+		onDidFilesChange = Event.None;
+	};
+	const labelService = new class extends mock<ILabelService>() {
+		getUriBasenameLabel(uri: URI) { return uri.toString(); }
+	};
+
+	test('working copy uri', function () {
+		if (1) {
+			this.skip();
+		}
+		const r1 = URI.parse('foo-files:///my.nb');
+		const r2 = URI.parse('bar-files:///my.nb');
+
+		const copies: IWorkingCopy[] = [];
+		const workingCopyService = new class extends mock<IWorkingCopyService>() {
+			registerWorkingCopy(copy: IWorkingCopy) {
+				copies.push(copy);
+				return Disposable.None;
+			}
+		};
+
+		new NotebookEditorModel(r1, 'fff', notebokService, workingCopyService, backupService, fileService, notificationService, new NullLogService(), labelService);
+		new NotebookEditorModel(r2, 'fff', notebokService, workingCopyService, backupService, fileService, notificationService, new NullLogService(), labelService);
+
+		assert.strictEqual(copies.length, 2);
+		assert.strictEqual(!isEqual(copies[0].resource, copies[1].resource), true);
+	});
+});