Corrected conditional in transition mixin to use not() as function.

lib/compass/css3/_transition.scss

@@ -171,7 +171,7 @@ $transitionable-prefixed-values: transform, transform-origin !default;
     @if length($transition) > 3 { $delay:           nth($transition, 4); $has-delays: true; }
 
     // If a delay is provided without a timing function
-    @if is-time($timing-function) and not $delay { $delay: $timing-function; $timing-function: false; $has-delays: true; }
+    @if is-time($timing-function) and not($delay) { $delay: $timing-function; $timing-function: false; $has-delays: true; }
 
     // Keep a list of delays in case one is specified
     $delays: append($delays, if($delay, $delay, 0s));

test/css3/transitionSpec.js

@@ -0,0 +1,13 @@
+var render = require('../helper/render');
+var ruleset = require('../helper/ruleset');
+
+describe("CSS3 Transition", function () {
+
+  it("should generate a transition", function (done) {
+    render(ruleset('$experimental-support-for-mozilla: false; $experimental-support-for-opera: false; @include transition(ok 0s);'), function(output, err) {
+      expect(output).toBe(ruleset('-webkit-transition:ok 0s;transition:ok 0s;'));
+      done();
+    }, ['compass/css3/transition']);
+  });
+
+});