Cross-origin isolation tests: Try enabling client-side media processing explicitly for the e2e test suite

packages/e2e-tests/plugins/enable-client-side-media-processing.php

@@ -0,0 +1,10 @@
+<?php
+/**
+ * Plugin Name: Gutenberg Test Plugin: Enable Client-Side Media Processing
+ * Plugin URI: https://github.com/WordPress/gutenberg
+ * Author: Gutenberg Team
+ *
+ * @package gutenberg-test-enable-client-side-media-processing
+ */
+
+add_filter( 'wp_client_side_media_processing_enabled', '__return_true' );

test/e2e/specs/editor/various/cross-origin-isolation.spec.js

@@ -36,17 +36,34 @@
 } );
 
 test.describe( 'Cross-origin isolation', () => {
+	test.beforeAll( async ( { requestUtils } ) => {
+		// Client-side media processing (and cross-origin isolation) is
+		// temporarily disabled in the Gutenberg plugin.
+		// See https://github.com/WordPress/gutenberg/pull/75756
+		await requestUtils.activatePlugin(
+			'gutenberg-test-plugin-enable-client-side-media-processing'
+		);
+	} );
+
+	test.afterAll( async ( { requestUtils } ) => {
+		await requestUtils.deactivatePlugin(
+			'gutenberg-test-plugin-enable-client-side-media-processing'
+		);
+	} );
+
 	test.beforeEach( async ( { admin } ) => {
 		await admin.createNewPost();
 	} );
 
-	test( 'should be cross-origin isolated by default', async ( { page } ) => {
-		// Verify that cross-origin isolation IS enabled (default state
-		// now that client-side media processing is graduated).
+	test( 'should be cross-origin isolated when client-side media processing is enabled', async ( {
+		page,
+	} ) => {
+		// Verify that cross-origin isolation IS enabled when
+		// client-side media processing is active.
 		const isCrossOriginIsolated = await page.evaluate(
 			() => window.crossOriginIsolated
 		);
 		expect( isCrossOriginIsolated ).toBe( true );
 	} );
 
 	test( 'should render embed previews when cross-origin isolated', async ( {
@@ -111,7 +128,7 @@
 		await expect(
 			iframe,
 			'Embed iframe should have crossorigin attribute'
 		).toHaveAttribute( 'crossorigin', 'anonymous' );
 	} );
 
 	test( 'should add credentialless attribute to embed iframes when supported', async ( {
@@ -143,7 +160,7 @@
 		await expect(
 			iframe,
 			'Embed iframe should have credentialless attribute'
 		).toHaveAttribute( 'credentialless', '' );
 	} );
 
 	test( 'should show placeholder for denylisted providers when credentialless not supported', async ( {