Small adjustments as per feedback

Removed $nextTick in test
Added test for checking if versions don't exist

ee/spec/frontend/packages/details/components/app_spec.js

@@ -178,13 +178,12 @@ describe('PackagesApp', () => {
 
       it('makes api request on first click of tab', () => {
         const apiMethodSpy = jest.spyOn(wrapper.vm, 'fetchPackageVersions');
+
         versionsTab().trigger('click');
 
-        return wrapper.vm.$nextTick(() => {
         expect(apiMethodSpy).toHaveBeenCalled();
       });
     });
-    });
 
     it('displays the loader when state is loading', () => {
       createComponent({ isLoading: true });

ee/spec/frontend/packages/details/store/actions_spec.js

@@ -34,6 +34,25 @@ describe('Actions Package details store', () => {
       );
     });
 
+    it("does not set the versions if they don't exist", done => {
+      Api.projectPackage = jest.fn().mockResolvedValue({ data: { packageEntity, versions: null } });
+
+      testAction(
+        actions.fetchPackageVersions,
+        undefined,
+        { packageEntity },
+        [{ type: types.SET_LOADING, payload: true }, { type: types.SET_LOADING, payload: false }],
+        [],
+        () => {
+          expect(Api.projectPackage).toHaveBeenCalledWith(
+            packageEntity.project_id,
+            packageEntity.id,
+          );
+          done();
+        },
+      );
+    });
+
     it('should create flash on API error', done => {
       Api.projectPackage = jest.fn().mockRejectedValue();
 
@@ -44,6 +63,10 @@ describe('Actions Package details store', () => {
         [{ type: types.SET_LOADING, payload: true }, { type: types.SET_LOADING, payload: false }],
         [],
         () => {
+          expect(Api.projectPackage).toHaveBeenCalledWith(
+            packageEntity.project_id,
+            packageEntity.id,
+          );
           expect(createFlash).toHaveBeenCalledWith(FETCH_PACKAGE_VERSIONS_ERROR);
           done();
         },