repro for issue 1219

Author: chirayuk

test/animate/css_animate_spec.dart

@@ -4,7 +4,7 @@ import 'dart:async';
 
 import '../_specs.dart';
 
-main() {
+_main() {
   describe('CssAnimate', () {
     TestBed _;
     Animate animate;
@@ -100,6 +100,11 @@ main() {
   });
 }
 
+main() {
+  _main();
+  _main();
+}
+
 class MockAnimationLoop extends Mock implements AnimationLoop {
   num time = 0.0;