Re-enabled some of the skipped notebook tests (microsoft#255087)

* Identify flaky test failures

* Updates

Author: DonJayamanne

extensions/vscode-api-tests/src/singlefolder-tests/ipynb.test.ts

@@ -6,13 +6,40 @@
 import * as assert from 'assert';
 import 'mocha';
 import * as vscode from 'vscode';
+import { assertNoRpc, closeAllEditors, createRandomFile } from '../utils';
+
+const ipynbContent = JSON.stringify({
+	"cells": [
+		{
+			"cell_type": "markdown",
+			"source": ["## Header"],
+			"metadata": {}
+		},
+		{
+			"cell_type": "code",
+			"execution_count": 2,
+			"source": ["print('hello 1')\n", "print('hello 2')"],
+			"outputs": [
+				{
+					"output_type": "stream",
+					"name": "stdout",
+					"text": ["hello 1\n", "hello 2\n"]
+				}
+			],
+			"metadata": {}
+		}
+	]
+});
+
+suite('ipynb NotebookSerializer', function () {
+	teardown(async function () {
+		assertNoRpc();
+		await closeAllEditors();
+	});
 
-(vscode.env.uiKind === vscode.UIKind.Web ? suite.skip : suite)('ipynb NotebookSerializer', function () {
 	test('Can open an ipynb notebook', async () => {
-		assert.ok(vscode.workspace.workspaceFolders);
-		const workspace = vscode.workspace.workspaceFolders[0];
-		const uri = vscode.Uri.joinPath(workspace.uri, 'test.ipynb');
-		const notebook = await vscode.workspace.openNotebookDocument(uri);
+		const file = await createRandomFile(ipynbContent, undefined, '.ipynb');
+		const notebook = await vscode.workspace.openNotebookDocument(file);
 		await vscode.window.showNotebookDocument(notebook);
 
 		const notebookEditor = vscode.window.activeNotebookEditor;

extensions/vscode-api-tests/src/singlefolder-tests/notebook.kernel.test.ts

@@ -123,7 +123,7 @@ const apiTestSerializer: vscode.NotebookSerializer = {
 	}
 };
 
-(vscode.env.uiKind === vscode.UIKind.Web ? suite.skip : suite)('Notebook Kernel API tests', function () {
+suite('Notebook Kernel API tests', function () {
 
 	const testDisposables: vscode.Disposable[] = [];
 	const suiteDisposables: vscode.Disposable[] = [];