Add e2e tests

packages/e2e-tests/plugins/allowed-patterns-disable-blocks.php

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+<?php
+/**
+ * Plugin Name: Gutenberg Test Allowed Patterns Disable Blocks
+ * Plugin URI: https://github.com/WordPress/gutenberg
+ * Author: Gutenberg Team
+ *
+ * @package gutenberg-test-allowed-patterns-disable-blocks
+ */
+
+/**
+ * Restrict the allowed blocks in the editor.
+ *
+ * @param  Array   $allowed_block_types An array of strings containing the previously allowed blocks.
+ * @param  WP_Post $post                The current post object.
+ * @return Array                        An array of strings containing the new allowed blocks after the filter is applied.
+ */
+function my_plugin_allowed_block_types( $allowed_block_types, $post ) {
+	if ( 'post' !== $post->post_type ) {
+		return $allowed_block_types;
+	}
+	return array( 'core/heading', 'core/columns', 'core/column', 'core/image', 'core/spacer' );
+}
+
+add_filter( 'allowed_block_types', 'my_plugin_allowed_block_types', 10, 2 );

packages/e2e-tests/plugins/allowed-patterns.php

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+<?php
+/**
+ * Plugin Name: Gutenberg Test Allowed Patterns
+ * Plugin URI: https://github.com/WordPress/gutenberg
+ * Author: Gutenberg Team
+ *
+ * @package gutenberg-test-allowed-patterns
+ */
+
+register_block_pattern(
+	'test-allowed-patterns/lone-heading',
+	array(
+		'title'   => 'Test: Single heading',
+		'scope'   => array(
+			'inserter' => true,
+		),
+		'content' => '<!-- wp:heading --><h2>Hello!</h2><!-- /wp:heading -->',
+	)
+);
+
+register_block_pattern(
+	'test-allowed-patterns/lone-paragraph',
+	array(
+		'title'   => 'Test: Single paragraph',
+		'scope'   => array(
+			'inserter' => true,
+		),
+		'content' => '<!-- wp:paragraph --><p>Hello!</p><!-- /wp:paragraph -->',
+	)
+);
+
+register_block_pattern(
+	'test-allowed-patterns/paragraph-inside-group',
+	array(
+		'title'   => 'Test: Paragraph inside group',
+		'scope'   => array(
+			'inserter' => true,
+		),
+		'content' => '<!-- wp:group --><div class="wp-block-group"><!-- wp:paragraph --><p>Hello!</p><!-- /wp:paragraph --></div><!-- /wp:group -->',
+	)
+);

packages/e2e-tests/specs/editor/various/allowed-patterns.test.js

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+/**
+ * WordPress dependencies
+ */
+import {
+	activatePlugin,
+	createNewPost,
+	deactivatePlugin,
+	searchForPattern,
+	toggleGlobalBlockInserter,
+} from '@wordpress/e2e-test-utils';
+
+const isPatternAvailable = async ( name ) => {
+	await searchForPattern( name );
+	const elements = await page.$x(
+		`//div[@role = 'option']//div[contains(text(), '${ name }')]`
+	);
+	const patternExists = elements.length > 0;
+	await toggleGlobalBlockInserter();
+	return patternExists;
+};
+
+const TEST_PATTERNS = [
+	[ 'Test: Single heading', false ],
+	[ 'Test: Single paragraph', true ],
+	[ 'Test: Paragraph inside group', true ],
+];
+
+describe( 'Allowed Patterns', () => {
+	beforeAll( async () => {
+		await activatePlugin( 'gutenberg-test-allowed-patterns' );
+	} );
+	afterAll( async () => {
+		await deactivatePlugin( 'gutenberg-test-allowed-patterns' );
+	} );
+	beforeEach( async () => {
+		await createNewPost();
+	} );
+
+	describe( 'Disable blocks plugin disabled', () => {
+		it( 'should show test patterns', async () => {
+			for ( const [ patternName ] of TEST_PATTERNS ) {
+				expect( await isPatternAvailable( patternName ) ).toBe( true );
+			}
+		} );
+	} );
+
+	describe( 'Disable blocks plugin enabled', () => {
+		beforeAll( async () => {
+			await activatePlugin(
+				'gutenberg-test-allowed-patterns-disable-blocks'
+			);
+		} );
+		afterAll( async () => {
+			await deactivatePlugin(
+				'gutenberg-test-allowed-patterns-disable-blocks'
+			);
+		} );
+
+		it( 'should not show test patterns', async () => {
+			for ( const [ patternName, shouldBeAvailable ] of TEST_PATTERNS ) {
+				expect( await isPatternAvailable( patternName ) ).toBe(
+					shouldBeAvailable
+				);
+			}
+		} );
+	} );
+} );