Add test for the group block

test/e2e/specs/editor/blocks/__snapshots__/Group-can-be-created-using-the-block-inserter-1-chromium.txt

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+<!-- wp:group -->
+<div class="wp-block-group"></div>
+<!-- /wp:group -->

test/e2e/specs/editor/blocks/__snapshots__/Group-can-be-created-using-the-slash-inserter-1-chromium.txt

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+<!-- wp:group -->
+<div class="wp-block-group"></div>
+<!-- /wp:group -->

test/e2e/specs/editor/blocks/__snapshots__/Group-can-have-other-blocks-appended-to-it-using-the-button-appender-1-chromium.txt

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+<!-- wp:group -->
+<div class="wp-block-group"><!-- wp:paragraph -->
+<p>Group Block with a Paragraph</p>
+<!-- /wp:paragraph --></div>
+<!-- /wp:group -->

test/e2e/specs/editor/blocks/group.spec.js

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+/**
+ * WordPress dependencies
+ */
+const { test, expect } = require( '@wordpress/e2e-test-utils-playwright' );
+
+test.describe( 'Group', () => {
+	test.beforeEach( async ( { admin } ) => {
+		await admin.createNewPost();
+	} );
+
+	test( 'can be created using the block inserter', async ( {
+		editor,
+		page,
+	} ) => {
+		// Search for the group block and insert it.
+		const inserterButton = page.locator(
+			'role=button[name="Toggle block inserter"i]'
+		);
+
+		await inserterButton.click();
+
+		await page.type(
+			'role=searchbox[name="Search for blocks and patterns"i]',
+			'Group'
+		);
+
+		await page.click(
+			'role=listbox[name="Blocks"i] >> role=option[name="Group"i]'
+		);
+
+		expect( await editor.getEditedPostContent() ).toMatchSnapshot();
+	} );
+
+	test( 'can be created using the slash inserter', async ( {
+		editor,
+		page,
+	} ) => {
+		await page.click( 'role=button[name="Add default block"i]' );
+		await page.keyboard.type( '/group' );
+		await expect(
+			page.locator( 'role=option[name="Group"i][selected]' )
+		).toBeVisible();
+		await page.keyboard.press( 'Enter' );
+
+		expect( await editor.getEditedPostContent() ).toMatchSnapshot();
+	} );
+
+	test( 'can have other blocks appended to it using the button appender', async ( {
+		editor,
+		page,
+	} ) => {
+		await editor.insertBlock( { name: 'core/group' } );
+		await page.click( 'role=button[name="Add block"i]' );
+		await page.click(
+			'role=listbox[name="Blocks"i] >> role=option[name="Paragraph"i]'
+		);
+		await page.keyboard.type( 'Group Block with a Paragraph' );
+
+		expect( await editor.getEditedPostContent() ).toMatchSnapshot();
+	} );
+} );