diff --git a/tests/phpunit/tests/admin/includes/ajax-actions/findPosts.php b/tests/phpunit/tests/admin/includes/ajax-actions/findPosts.php
new file mode 100644
index 0000000000000..2ca9b411edd7c
--- /dev/null
+++ b/tests/phpunit/tests/admin/includes/ajax-actions/findPosts.php
@@ -0,0 +1,112 @@
+<?php
+
+/**
+ * Admin Ajax functions to be tested.
+ */
+require_once ABSPATH . 'wp-admin/includes/ajax-actions.php';
+
+/**
+ * Testing wp_ajax_find_posts() functionality.
+ *
+ * @package WordPress
+ * @subpackage UnitTests
+ * @since 3.1.0
+ *
+ * @group ajax
+ *
+ * @covers ::wp_ajax_find_posts
+ */
+class Tests_wp_ajax_find_posts extends WP_Ajax_UnitTestCase {
+
+	/**
+	 * Administrator user ID.
+	 *
+	 * @var int
+	 */
+	protected static $admin_id;
+
+	/**
+	 * Setup test fixtures.
+	 *
+	 * @param WP_UnitTest_Factory $factory
+	 */
+	public static function wpSetUpBeforeClass( WP_UnitTest_Factory $factory ): void {
+		self::$admin_id = $factory->user->create( array( 'role' => 'administrator' ) );
+	}
+
+	/**
+	 * Tests successful post search.
+	 *
+	 * @ticket 65252
+	 */
+	public function test_find_posts_success(): void {
+		wp_set_current_user( self::$admin_id );
+
+		$post_id = self::factory()->post->create(
+			array(
+				'post_title' => 'Searchable Post Title',
+			)
+		);
+
+		$_POST = array(
+			'action'      => 'find-posts',
+			'ps'          => 'Searchable',
+			'_ajax_nonce' => wp_create_nonce( 'find-posts' ),
+		);
+
+		try {
+			$this->_handleAjax( 'find-posts' );
+		} catch ( WPAjaxDieContinueException $e ) {
+			// Expect success.
+		}
+
+		$this->assertStringContainsString( 'Searchable Post Title', $this->_last_response );
+		$this->assertStringContainsString( 'class="widefat"', $this->_last_response );
+	}
+
+	/**
+	 * Tests failure due to invalid nonce.
+	 *
+	 * @ticket 65252
+	 */
+	public function test_find_posts_invalid_nonce(): void {
+		wp_set_current_user( self::$admin_id );
+
+		$_POST = array(
+			'action'      => 'find-posts',
+			'ps'          => 'Searchable',
+			'_ajax_nonce' => 'invalid-nonce',
+		);
+
+		$this->expectException( WPAjaxDieContinueException::class );
+		$this->expectExceptionMessage( '-1' );
+
+		$this->_handleAjax( 'find-posts' );
+	}
+
+	/**
+	 * Tests failure when no results are found.
+	 *
+	 * @ticket 65252
+	 */
+	public function test_find_posts_no_results(): void {
+		wp_set_current_user( self::$admin_id );
+
+		$_POST = array(
+			'action'      => 'find-posts',
+			'ps'          => 'NonExistentTitle',
+			'_ajax_nonce' => wp_create_nonce( 'find-posts' ),
+		);
+
+		try {
+			$this->_handleAjax( 'find-posts' );
+		} catch ( WPAjaxDieContinueException $e ) {
+			// Expect success.
+		}
+
+		$response = json_decode( $this->_last_response, true );
+		$this->assertIsArray( $response );
+		$this->assertFalse( $response['success'] );
+		$this->assertSame( 'No items found.', $response['data'] );
+	}
+}