Tests: Don't test synchronous XHR on unload in Chrome

Chrome 78 dropped support for synchronous XHR requests inside of
beforeunload, unload, pagehide, and visibilitychange event handlers.
See https://bugs.chromium.org/p/chromium/issues/detail?id=952452

Closes gh-4536

diff --git a/test/unit/ajax.js b/test/unit/ajax.js
index 7bf3f686b1dddcb5059469424117c3a5bd5d3120..fda7a9daf08317608ebab277b2dc926395e5b2cf 100644 (file)
--- a/test/unit/ajax.js
+++ b/test/unit/ajax.js
@@ -2001,14 +2001,19 @@ if ( typeof window.ArrayBuffer === "undefined" || typeof new XMLHttpRequest().re
                };
        } );
 
-       testIframe(
-               "#14379 - jQuery.ajax() on unload",
-               "ajax/onunload.html",
-               function( assert, jQuery, window, document, status ) {
-                       assert.expect( 1 );
-                       assert.strictEqual( status, "success", "Request completed" );
-               }
-       );
+       // Chrome 78 dropped support for synchronous XHR requests inside of
+       // beforeunload, unload, pagehide, and visibilitychange event handlers.
+       // See https://bugs.chromium.org/p/chromium/issues/detail?id=952452
+       if ( !/chrome/i.test( navigator.userAgent ) ) {
+               testIframe(
+                       "#14379 - jQuery.ajax() on unload",
+                       "ajax/onunload.html",
+                       function( assert, jQuery, window, document, status ) {
+                               assert.expect( 1 );
+                               assert.strictEqual( status, "success", "Request completed" );
+                       }
+               );
+       }
 
        ajaxTest( "#14683 - jQuery.ajax() - Exceptions thrown synchronously by xhr.send should be caught", 4, function( assert ) {
                return [ {