add UI test for quick selector add step

re #1000

test/ui/spec/defaultHtmlSequencerUi.spec.js

@@ -39,4 +39,10 @@ describe('Default sequencer HTML', function() {
   it('import options from url', function() {
     expect(defaultHtmlSequencerUi.importStepsFromUrlHash).toHaveBeenCalled();
   });
-});
+  
+  it('adds a step from the quick selector', function() {
+    expect($('.step').length).toBe(1);
+    $("[data-value='brightness']").click()
+    expect($('.step').length).toBe(2);
+  });
+});