diff --git a/tests/phpunit/tests/admin/includes/ajax-actions/menuQuickSearch.php b/tests/phpunit/tests/admin/includes/ajax-actions/menuQuickSearch.php
new file mode 100644
index 0000000000000..a3ccd4a74d12a
--- /dev/null
+++ b/tests/phpunit/tests/admin/includes/ajax-actions/menuQuickSearch.php
@@ -0,0 +1,195 @@
+<?php
+
+/**
+ * Admin Ajax functions to be tested.
+ */
+require_once ABSPATH . 'wp-admin/includes/ajax-actions.php';
+
+/**
+ * Testing wp_ajax_menu_quick_search() functionality.
+ *
+ * @package WordPress
+ * @subpackage UnitTests
+ * @since 3.1.0
+ *
+ * @group ajax
+ *
+ * @covers ::wp_ajax_menu_quick_search
+ */
+class Tests_wp_ajax_menu_quick_search extends WP_Ajax_UnitTestCase {
+
+	/**
+	 * Administrator user ID.
+	 *
+	 * @var int
+	 */
+	protected static $admin_id;
+
+	/**
+	 * Subscriber user ID.
+	 *
+	 * @var int
+	 */
+	protected static $subscriber_id;
+
+	/**
+	 * Setup test fixtures.
+	 *
+	 * @param WP_UnitTest_Factory $factory
+	 */
+	public static function wpSetUpBeforeClass( WP_UnitTest_Factory $factory ): void {
+		self::$admin_id      = $factory->user->create( array( 'role' => 'administrator' ) );
+		self::$subscriber_id = $factory->user->create( array( 'role' => 'subscriber' ) );
+	}
+
+	/**
+	 * Tests successful menu quick search for a post (JSON format).
+	 *
+	 * @ticket 65252
+	 */
+	public function test_menu_quick_search_post_json(): void {
+		wp_set_current_user( self::$admin_id );
+
+		$post_id = self::factory()->post->create(
+			array(
+				'post_title' => 'Quick Search Post',
+			)
+		);
+
+		$_POST = array(
+			'action'          => 'menu-quick-search',
+			'type'            => 'get-post-item',
+			'object_type'     => 'post',
+			'ID'              => $post_id,
+			'response-format' => 'json',
+		);
+
+		try {
+			$this->_handleAjax( 'menu-quick-search' );
+		} catch ( WPAjaxDieContinueException $e ) {
+			// Expect success.
+		}
+
+		$response = json_decode( $this->_last_response, true );
+		$this->assertSame( $post_id, $response['ID'] );
+		$this->assertSame( 'Quick Search Post', $response['post_title'] );
+		$this->assertSame( 'post', $response['post_type'] );
+	}
+
+	/**
+	 * Tests successful menu quick search for a post (markup format).
+	 *
+	 * @ticket 65252
+	 */
+	public function test_menu_quick_search_post_markup(): void {
+		wp_set_current_user( self::$admin_id );
+
+		$post_id = self::factory()->post->create(
+			array(
+				'post_title' => 'Quick Search Post Markup',
+			)
+		);
+
+		$_POST = array(
+			'action'          => 'menu-quick-search',
+			'type'            => 'get-post-item',
+			'object_type'     => 'post',
+			'ID'              => $post_id,
+			'response-format' => 'markup',
+		);
+
+		try {
+			$this->_handleAjax( 'menu-quick-search' );
+		} catch ( WPAjaxDieContinueException $e ) {
+			// Expect success.
+		}
+
+		$this->assertStringContainsString( 'Quick Search Post Markup', $this->_last_response );
+		$this->assertStringContainsString( 'menu-item-title', $this->_last_response );
+	}
+
+	/**
+	 * Tests successful menu quick search for a taxonomy term (JSON format).
+	 *
+	 * @ticket 65252
+	 */
+	public function test_menu_quick_search_taxonomy_json(): void {
+		wp_set_current_user( self::$admin_id );
+
+		$term_id = self::factory()->term->create(
+			array(
+				'name'     => 'Quick Search Term',
+				'taxonomy' => 'category',
+			)
+		);
+
+		$_POST = array(
+			'action'          => 'menu-quick-search',
+			'type'            => 'get-post-item',
+			'object_type'     => 'category',
+			'ID'              => $term_id,
+			'response-format' => 'json',
+		);
+
+		try {
+			$this->_handleAjax( 'menu-quick-search' );
+		} catch ( WPAjaxDieContinueException $e ) {
+			// Expect success.
+		}
+
+		$response = json_decode( $this->_last_response, true );
+		$this->assertSame( $term_id, $response['ID'] );
+		$this->assertSame( 'Quick Search Term', $response['post_title'] );
+		$this->assertSame( 'category', $response['post_type'] );
+	}
+
+	/**
+	 * Tests successful quick search by query (JSON format).
+	 *
+	 * @ticket 65252
+	 */
+	public function test_menu_quick_search_query_json(): void {
+		wp_set_current_user( self::$admin_id );
+
+		$post_id = self::factory()->post->create(
+			array(
+				'post_title' => 'UniqueQueryPost',
+			)
+		);
+
+		$_POST = array(
+			'action'          => 'menu-quick-search',
+			'type'            => 'quick-search-posttype-post',
+			'q'               => 'UniqueQueryPost',
+			'response-format' => 'json',
+		);
+
+		try {
+			$this->_handleAjax( 'menu-quick-search' );
+		} catch ( WPAjaxDieContinueException $e ) {
+			// Expect success.
+		}
+
+		$response = json_decode( $this->_last_response, true );
+		$this->assertSame( $post_id, $response['ID'] );
+		$this->assertSame( 'UniqueQueryPost', $response['post_title'] );
+	}
+
+	/**
+	 * Tests failure due to insufficient permissions.
+	 *
+	 * @ticket 65252
+	 */
+	public function test_menu_quick_search_insufficient_permissions(): void {
+		wp_set_current_user( self::$subscriber_id );
+
+		$_POST = array(
+			'action' => 'menu-quick-search',
+		);
+
+		$this->expectException( WPAjaxDieStopException::class );
+		$this->expectExceptionMessage( '-1' );
+
+		$this->_handleAjax( 'menu-quick-search' );
+	}
+}