Tests: Strip untypical callback parameter characters from PHP files2.2-stable

Only allow alphanumeric characters & underscores for callback parameters.
This is only test code so we're not fixing any security issue but it happens
often enough that the whole jQuery repository directory structure is deployed
onto the server with PHP enabled that it makes is easy to introduce security
issues if this cleanup is not done.

This is a 1.x/2.x version of PR gh-4871.

The change doesn't require a release; it's meant at installations testing
the latest state of `1.12-stable` & `2.2-stable` branches.

This change also fixes testing on Travis & on Chrome/Firefox.

Closes gh-4875
Ref gh-4764
Ref gh-4871

1 files changed, 14 insertions, 8 deletions

diff --git a/test/unit/ajax.js b/test/unit/ajax.js
index 8b46c57c2..d05d54a65 100644
--- a/test/unit/ajax.js
+++ b/test/unit/ajax.js
@@ -1758,14 +1758,20 @@ if ( typeof window.ArrayBuffer === "undefined" || typeof new XMLHttpRequest().re
 		};
 	} );
 
-	testIframeWithCallback(
-		"#14379 - jQuery.ajax() on unload",
-		"ajax/onunload.html",
-		function( status, assert ) {
-			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
+	// Safari 13 did similar changes. The below check will catch them both.
+	if ( !/safari/i.test( navigator.userAgent ) ) {
+		testIframeWithCallback(
+			"#14379 - jQuery.ajax() on unload",
+			"ajax/onunload.html",
+			function( status, assert ) {
+				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 [ {