Fixes #7912. Make sure .cur() only returns 0 as fallback value when it needs to ("", auto, undefined, null).

This change makes .cur() more .cssHooks friendly. .cur() now returns the unmodified value by
.css() if it isn't a number, number-alike or a value that needs a fallback to 0.
This way fx.start doesn't need to be recalculated for complex values.

1 files changed, 38 insertions, 15 deletions

diff --git a/test/unit/effects.js b/test/unit/effects.js
index a07c076d7..4bb92fc00 100644
--- a/test/unit/effects.js
+++ b/test/unit/effects.js
@@ -558,21 +558,44 @@ jQuery.checkOverflowDisplay = function(){
 	start();
 }
 
-test("support negative values < -10000 (bug #7193)", function () {
-	expect(1);
-	stop();
-
-	jQuery.extend(jQuery.fx.step, {
-		"marginBottom": function(fx) {
-			equals( fx.cur(), -11000, "Element has margin-bottom of -11000" );
-			delete jQuery.fx.step.marginBottom;
-		}
-	});
-
-	jQuery("#main").css("marginBottom", "-11000px").animate({ marginBottom: "-11001px" }, {
-		duration: 1,
-		complete: start
-	});
+test("jQuery.fx.prototype.cur()", function() {
+	expect(5);
+	var nothiddendiv = jQuery('#nothiddendiv').css({
+			color: '#ABC',
+			border: '5px solid black',
+			left: 'auto',
+			marginBottom: '11000px'
+		})[0];
+
+	equals(
+		(new jQuery.fx( nothiddendiv, {}, 'color' )).cur(),
+		jQuery.css( nothiddendiv,'color' ),
+		"Return the same value as jQuery.css for complex properties (bug #7912)"
+	);
+
+	strictEqual(
+		(new jQuery.fx( nothiddendiv, {}, 'borderLeftWidth' )).cur(),
+		5,
+		"Return simple values parsed as Float"
+	);
+
+	strictEqual(
+		(new jQuery.fx( nothiddendiv, {}, 'backgroundPosition' )).cur(),
+		0,
+		'Return 0 when jQuery.css returns an empty string'
+	);
+
+	strictEqual(
+		(new jQuery.fx( nothiddendiv, {}, 'left' )).cur(),
+		0,
+		'Return 0 when jQuery.css returns "auto"'
+	);
+
+	equals(
+		(new jQuery.fx( nothiddendiv, {}, 'marginBottom' )).cur(),
+		11000,
+		"support negative values < -10000 (bug #7193)"
+	);
 });
 
 test("JS Overflow and Display", function() {