Fix #11971 unit test in browsers lacking backgroundPositionX.

Closes gh-850.

diff --git a/test/unit/effects.js b/test/unit/effects.js
index 402a7a58799239ec41a8d7630be4234b59e4abb7..35ba27275e3a1e884903b6168523208313cc5d4b 100644 (file)
--- a/test/unit/effects.js
+++ b/test/unit/effects.js
@@ -1681,6 +1681,13 @@ asyncTest( "non-px animation handles non-numeric start (#11971)", 2, function()
        var foo = jQuery("#foo"),
                initial = foo.css("backgroundPositionX");
 
+       if ( initial == null ) {
+               expect(1);
+               ok( true, "Style property not understood" );
+               start();
+               return;
+       }
+
        foo.animate({ backgroundPositionX: "42%" }, {
                duration: 1,
                progress: function( anim, percent ) {