test(ngStyle): ensure lazy one-time binding is supported

Closes #11405

Author: Narretz

test/ng/directive/ngStyleSpec.js

@@ -23,6 +23,15 @@ describe('ngStyle', function() {
   }));
 
 
+  it('should support lazy one-time binding for object literals', inject(function($rootScope, $compile) {
+    element = $compile('<div ng-style="::{height: heightStr}"></div>')($rootScope);
+    $rootScope.$digest();
+    expect(element.css('height')).toBeFalsy();
+    $rootScope.$apply('heightStr = "40px"');
+    expect(element.css('height')).toBe('40px');
+  }));
+
+
   describe('preserving styles set before and after compilation', function() {
     var scope, preCompStyle, preCompVal, postCompStyle, postCompVal, element;