Fix sidebar_detail_row_spec.js

spec/javascripts/jobs/sidebar_detail_row_spec.js

@@ -38,10 +38,13 @@ describe('Sidebar detail row', () => {
     ).toEqual('this is the title: this is the value');
   });
 
-  it('should not render help when helpUrl not provided', () => {
-    expect(vm.$el.querySelector('.help-button')).toBeUndefined();
+  describe('when helpUrl not provided', () => {
+    it('should not render help', () => {
+      expect(vm.$el.querySelector('.help-button')).toBeNull();
+    });
   });
 
+  describe('when helpUrl provided', () => {
     beforeEach(() => {
       vm = new SidebarDetailRow({
         propsData: {
@@ -51,7 +54,8 @@ describe('Sidebar detail row', () => {
       }).$mount();
     });
 
-  it('should render help when helpUrl is provided', () => {
+    it('should render help', () => {
       expect(vm.$el.querySelector('.help-button a').getAttribute('href')).toEqual('help url');
     });
+  });
 });