diff --git a/packages/e2e-tests/plugins/block-templates.php b/packages/e2e-tests/plugins/block-templates.php
new file mode 100644
index 0000000000000..e8321a1d74542
--- /dev/null
+++ b/packages/e2e-tests/plugins/block-templates.php
@@ -0,0 +1,17 @@
+<?php
+/**
+ * Plugin Name: Gutenberg Test Block Templates
+ * Plugin URI: https://github.com/WordPress/gutenberg
+ * Author: Gutenberg Team
+ *
+ * @package gutenberg-test-block-templates
+ */
+
+/**
+ * Activate Block Templates.
+ */
+function enqueue_block_templates() {
+	add_theme_support( 'block-templates' );
+}
+
+add_action( 'setup_theme', 'enqueue_block_templates' );
diff --git a/packages/e2e-tests/specs/experiments/post-editor-template-mode.test.js b/packages/e2e-tests/specs/experiments/post-editor-template-mode.test.js
index e28082d2d2157..5e8d80b1f45c5 100644
--- a/packages/e2e-tests/specs/experiments/post-editor-template-mode.test.js
+++ b/packages/e2e-tests/specs/experiments/post-editor-template-mode.test.js
@@ -9,6 +9,8 @@ import {
 	trashAllPosts,
 	openPreviewPage,
 	openDocumentSettingsSidebar,
+	activatePlugin,
+	deactivatePlugin,
 } from '@wordpress/e2e-test-utils';
 
 const openSidebarPanelWithTitle = async ( title ) => {
@@ -89,12 +91,14 @@ const createNewTemplate = async ( templateName ) => {
 
 describe( 'Post Editor Template mode', () => {
 	beforeAll( async () => {
+		await activatePlugin( 'gutenberg-test-block-templates' );
 		await trashAllPosts( 'wp_template' );
 		await trashAllPosts( 'wp_template_part' );
 	} );
 
 	afterAll( async () => {
 		await activateTheme( 'twentytwentyone' );
+		await deactivatePlugin( 'gutenberg-test-block-templates' );
 	} );
 
 	it( 'Allow to switch to template mode, edit the template and check the result', async () => {