Make tests pass in phantomjs

phantomjs doesn't support window.history.state, so we can't test
anything related to it when running there.

Author: aroben

test/unit/pjax.js

@@ -1015,6 +1015,7 @@ if ($.support.pjax) {
   asyncTest("handles going back to pjaxed state after reloading a fragment navigation", function() {
     var iframe = this.iframe
     var frame = this.frame
+    var supportsHistoryState = 'state' in window.history
 
     // Get some pjax state in the history.
     frame.$.pjax({
@@ -1023,28 +1024,33 @@ if ($.support.pjax) {
     })
     frame.$("#main").on("pjax:complete", function() {
       var state = frame.history.state
-      ok(frame.history.state)
       ok(frame.$.pjax.state)
+      if (supportsHistoryState)
+        ok(frame.history.state)
 
       // Navigate to a fragment, which will result in a new history entry with
       // no state object. $.pjax.state remains unchanged however.
       iframe.src = frame.location.href + '#foo'
-      ok(!frame.history.state)
       ok(frame.$.pjax.state)
+      if (supportsHistoryState)
+        ok(!frame.history.state)
 
       // Reload the frame. This will clear out $.pjax.state.
       frame.location.reload()
       $(iframe).one("load", function() {
-        ok(!frame.history.state)
         ok(!frame.$.pjax.state)
+        if (supportsHistoryState)
+          ok(!frame.history.state)
 
         // Go back to #main. We'll get a popstate event with a pjax state
         // object attached from the initial pjax navigation, even though
         // $.pjax.state is null.
         window.iframeLoad = function() {
-          ok(frame.history.state)
           ok(frame.$.pjax.state)
-          equal(frame.$.pjax.state.id, state.id)
+          if (supportsHistoryState) {
+            ok(frame.history.state)
+            equal(frame.$.pjax.state.id, state.id)
+          }
           start()
         }
         frame.history.back()