ensure coverage

Author: yyx990803

src/transition/transition.js

@@ -214,6 +214,7 @@ p.getCssTransitionType = function (className) {
   // firing until the page is visible again.
   // pageVisibility API is supported in IE10+, same as
   // CSS transitions.
+  /* istanbul ignore if */
   if (!transitionEndEvent || (doc && doc.hidden)) {
     return
   }

test/unit/specs/transition/transition_spec.js

@@ -289,7 +289,20 @@ if (_.inBrowser && !_.isIE9) {
         transition.apply(el, 1, op, vm)
         _.nextTick(function () {
           expect(el.__v_trans.typeCache['test-enter']).not.toBeUndefined()
-          done()
+          // for some reason window.getComputedStyle cannot be spied on in
+          // phantomjs after the refactor...
+          var calls = 0
+          Object.defineProperty(el.__v_trans.typeCache, 'test-enter', {
+            get: function () {
+              calls++
+              return 1
+            }
+          })
+          transition.apply(el, 1, op, vm)
+          _.nextTick(function () {
+            expect(calls).toBe(1)
+            done()
+          })
         })
       })