michael@0: function test() {
michael@0:   waitForExplicitFinish();
michael@0: 
michael@0:   let tab = gBrowser.addTab("http://example.com");
michael@0: 
michael@0:   tab.linkedBrowser.addEventListener("load", function() {
michael@0:     tab.linkedBrowser.removeEventListener("load", arguments.callee, true);
michael@0: 
michael@0:     let numLocationChanges = 0;
michael@0: 
michael@0:     let listener = {
michael@0:       onLocationChange: function() {
michael@0:         numLocationChanges++;
michael@0:       }
michael@0:     };
michael@0: 
michael@0:     gBrowser.addTabsProgressListener(listener);
michael@0: 
michael@0:     // pushState to a new URL (http://example.com/foo").  This should trigger
michael@0:     // exactly one LocationChange event.
michael@0:     tab.linkedBrowser.contentWindow.history.pushState(null, null, "foo");
michael@0: 
michael@0:     executeSoon(function() {
michael@0:       gBrowser.removeTab(tab);
michael@0:       gBrowser.removeTabsProgressListener(listener);
michael@0:       is(numLocationChanges, 1,
michael@0:          "pushState should cause exactly one LocationChange event.");
michael@0:       finish();
michael@0:     });
michael@0: 
michael@0:   }, true);
michael@0: }