E2E test: re-enable large python notebook test & add large R notebook test (#7303)

This test was disabled due to failure with the upstream merge. For some
reason mouse scroll no longer works to advance down the page with a
large Python notebook, but PageDown does. This is good news because it
makes the test much faster. However, PageDown does not work with a large
R notebook and mouse scroll does (added a large R notebook test based on
a conversion of the large Python notebook to R).

### QA Notes

@:win @:notebooks

Author: testlabauto

test/e2e/tests/notebook/notebook-large-python.test.ts

@@ -8,40 +8,33 @@ import { test, expect, tags } from '../_test.setup';
 
 test.use({
 	suiteId: __filename,
-	snapshots: false,
 });
 
-// Note that this test is too heavy to pass on web and windows
+// test is too heavy for web
 test.describe('Large Python Notebook', {
 	tag: [tags.NOTEBOOKS, tags.WIN]
 }, () => {
 
-	test.skip('Python - Large notebook execution', {
-		annotation: [{ type: 'issue', description: 'https://github.com/posit-dev/positron/issues/7255' }]
-	}, async function ({ app, python }) {
-		test.setTimeout(480_000); // huge timeout because this is a heavy test
+	test('Python - Large notebook execution', async function ({ app, python }) {
+		test.slow();
 		const notebooks = app.workbench.notebooks;
 
-
 		await app.workbench.quickaccess.openDataFile(join(app.workspacePathOrFolder, 'workspaces', 'large_py_notebook', 'spotify.ipynb'));
 		await notebooks.selectInterpreter('Python');
 
 		await notebooks.runAllCells(120000);
 
+		await app.workbench.layouts.enterLayout('notebook');
+
 		await app.workbench.quickaccess.runCommand('notebook.focusTop');
 		await app.code.driver.page.locator('span').filter({ hasText: 'import pandas as pd' }).locator('span').first().click();
 
 		const allFigures: any[] = [];
 		const uniqueLocators = new Set<string>();
 
-		for (let i = 0; i < 6; i++) {
+		for (let i = 0; i < 12; i++) {
 
-			// the second param to wheel (y) seems to be ignored so we send
-			// more messages instead of one with a large y value
-			for (let j = 0; j < 100; j++) {
-				await app.code.driver.page.mouse.wheel(0, 1);
-				await app.code.driver.page.waitForTimeout(100);
-			}
+			await app.code.driver.page.keyboard.press('PageDown');
 
 			const figureLocator = app.workbench.notebooks.frameLocator.locator('.plot-container');
 			const figures = await figureLocator.all();

test/e2e/tests/notebook/notebook-large-r.test.ts

@@ -0,0 +1,58 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (C) 2025 Posit Software, PBC. All rights reserved.
+ *  Licensed under the Elastic License 2.0. See LICENSE.txt for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { join } from 'path';
+import { test, expect, tags } from '../_test.setup';
+
+test.use({
+	suiteId: __filename,
+	snapshots: false
+});
+
+// test is too heavy for web
+test.describe('Large R Notebook', {
+	tag: [tags.NOTEBOOKS, tags.WIN]
+}, () => {
+
+	test('R - Large notebook execution', async function ({ app, r }) {
+		test.slow();
+		const notebooks = app.workbench.notebooks;
+
+		await app.workbench.quickaccess.openDataFile(join(app.workspacePathOrFolder, 'workspaces', 'large_r_notebook', 'spotify.ipynb'));
+		await notebooks.selectInterpreter('R');
+
+		await notebooks.runAllCells(120000);
+
+		await app.workbench.layouts.enterLayout('notebook');
+
+		await app.workbench.quickaccess.runCommand('notebook.focusTop');
+		await app.code.driver.page.locator('span').filter({ hasText: 'library(dplyr)' }).locator('span').first().click();
+
+		const allFigures: any[] = [];
+		const uniqueLocators = new Set<string>();
+
+		for (let i = 0; i < 6; i++) {
+
+			for (let j = 0; j < 100; j++) {
+				// second param to mouse.wheel is not processed correctly so loop is needed
+				await app.code.driver.page.mouse.wheel(0, 1);
+			}
+
+			const figureLocator = app.workbench.notebooks.frameLocator.locator('.output_container');
+			const figures = await figureLocator.all();
+
+			if (figures!.length > 0) {
+				for (const figure of figures!) {
+					if (!uniqueLocators.has(figure.toString())) {
+						allFigures.push(figure);
+						uniqueLocators.add(figure.toString());
+					}
+				}
+			}
+		}
+
+		expect(allFigures.length).toBeGreaterThan(20);
+	});
+});