diff --git a/tests/phpunit/tests/admin/includes/ajax-actions/wpAjaxImgeditPreview.php b/tests/phpunit/tests/admin/includes/ajax-actions/wpAjaxImgeditPreview.php
new file mode 100644
index 0000000000000..99d7126c1ad4b
--- /dev/null
+++ b/tests/phpunit/tests/admin/includes/ajax-actions/wpAjaxImgeditPreview.php
@@ -0,0 +1,133 @@
+<?php
+
+/**
+ * Admin Ajax functions to be tested.
+ */
+require_once ABSPATH . 'wp-admin/includes/ajax-actions.php';
+
+/**
+ * Testing wp_ajax_imgedit_preview() functionality.
+ *
+ * @package WordPress
+ * @subpackage UnitTests
+ * @since 3.1.0
+ *
+ * @group ajax
+ *
+ * @covers ::wp_ajax_imgedit_preview
+ */
+class Tests_wp_ajax_imgedit_preview extends WP_Ajax_UnitTestCase {
+
+	/**
+	 * Attachment ID.
+	 *
+	 * @var int
+	 */
+	protected static $attachment_id;
+
+	/**
+	 * Setup test fixtures.
+	 */
+	public static function wpSetUpBeforeClass( WP_UnitTest_Factory $factory ): void {
+		self::$attachment_id = $factory->attachment->create_object(
+			array(
+				'file'           => DIR_TESTDATA . '/images/canola.jpg',
+				'post_mime_type' => 'image/jpeg',
+			)
+		);
+	}
+
+	/**
+	 * Tests image editor preview via AJAX.
+	 *
+	 * @ticket 65252
+	 */
+	public function test_imgedit_preview(): void {
+		// Mock the user to allow the request.
+		$this->_setRole( 'administrator' );
+
+		$_GET['postid']      = self::$attachment_id;
+		$_GET['_ajax_nonce'] = wp_create_nonce( 'image_editor-' . self::$attachment_id );
+
+		// Make the request.
+		try {
+			$this->_handleAjax( 'imgedit_preview' );
+		} catch ( WPAjaxDieContinueException $e ) {
+			// Expected exception.
+			$this->_last_response = (string) $e->getMessage();
+		} catch ( WPAjaxDieStopException $e ) {
+			// Expected exception.
+			$this->_last_response = (string) $e->getMessage();
+		}
+
+		// Since stream_preview_image() calls wp_stream_image() which eventually dies,
+		// and WP_Ajax_UnitTestCase catches these, we check the response.
+		// However, wp_stream_image for JPEG would output binary data.
+		// In test environment, it might be captured or we just ensure it didn't die with -1.
+		$this->assertNotEquals( '-1', $this->_last_response, 'The AJAX request failed with -1' );
+	}
+
+	/**
+	 * Tests imgedit_preview with missing post ID.
+	 *
+	 * @ticket 65252
+	 */
+	public function test_imgedit_preview_missing_postid(): void {
+		$this->_setRole( 'administrator' );
+
+		unset( $_GET['postid'] );
+		$_GET['_ajax_nonce'] = wp_create_nonce( 'image_editor-' );
+
+		$this->expectException( 'WPAjaxDieStopException' );
+		$this->expectExceptionMessage( '-1' );
+		$this->_handleAjax( 'imgedit_preview' );
+	}
+
+	/**
+	 * Tests imgedit_preview with invalid post ID.
+	 *
+	 * @ticket 65252
+	 */
+	public function test_imgedit_preview_invalid_postid(): void {
+		$this->_setRole( 'administrator' );
+
+		$_GET['postid']      = 99999;
+		$_GET['_ajax_nonce'] = wp_create_nonce( 'image_editor-99999' );
+
+		$this->expectException( 'WPAjaxDieStopException' );
+		$this->expectExceptionMessage( '-1' );
+		$this->_handleAjax( 'imgedit_preview' );
+	}
+
+	/**
+	 * Tests imgedit_preview as an unprivileged user.
+	 *
+	 * @ticket 65252
+	 */
+	public function test_imgedit_preview_unprivileged_user(): void {
+		$this->_setRole( 'subscriber' );
+
+		$_GET['postid']      = self::$attachment_id;
+		$_GET['_ajax_nonce'] = wp_create_nonce( 'image_editor-' . self::$attachment_id );
+
+		$this->expectException( 'WPAjaxDieStopException' );
+		$this->expectExceptionMessage( '-1' );
+		$this->_handleAjax( 'imgedit_preview' );
+	}
+
+	/**
+	 * Tests imgedit_preview with invalid nonce.
+	 *
+	 * @ticket 65252
+	 */
+	public function test_imgedit_preview_invalid_nonce(): void {
+		$this->_setRole( 'administrator' );
+
+		$_GET['postid']      = self::$attachment_id;
+		$_GET['_ajax_nonce'] = 'invalid-nonce';
+
+		$this->expectException( 'WPAjaxDieStopException' );
+		$this->expectExceptionMessage( '-1' );
+		$this->_handleAjax( 'imgedit_preview' );
+	}
+}