feat(tests): add more RowDetailExtension tests (#185)

* feat(tests): add more Extensions unit tests

* refactor(tests): cleanup some test code

* feat(tests): add more RowDetailExtension unit tests

src/aurelia-slickgrid/extensions/__tests__/checkboxSelectorExtension.spec.ts

@@ -20,6 +20,7 @@ const mockAddon = jest.fn().mockImplementation(() => ({
   getColumnDefinition: jest.fn(),
   selectRows: jest.fn(),
 }));
+
 const mockSelectionModel = jest.fn().mockImplementation(() => ({
   init: jest.fn(),
   destroy: jest.fn()

src/aurelia-slickgrid/extensions/__tests__/draggableGroupingExtension.spec.ts

@@ -42,7 +42,12 @@ describe('draggableGroupingExtension', () => {
     extension = new DraggableGroupingExtension(extensionUtility, sharedService);
   });
 
-  it('should return null when either the grid object or the grid options is missing', () => {
+  it('should return null after calling "create" method when the grid options is missing', () => {
+    const output = extension.create(null);
+    expect(output).toBeNull();
+  });
+
+  it('should return null after calling "register" method when either the grid object or the grid options is missing', () => {
     const output = extension.register();
     expect(output).toBeNull();
   });

src/aurelia-slickgrid/extensions/__tests__/headerMenuExtension.spec.ts

@@ -6,15 +6,11 @@ import { HeaderMenuExtension } from '../headerMenuExtension';
 import { ExtensionUtility } from '../extensionUtility';
 import { SharedService } from '../../services/shared.service';
 import { Column, ColumnSort } from '../../models';
-import { ExportService, FilterService, SortService } from '../../services';
+import { FilterService, SortService } from '../../services';
 
 declare var Slick: any;
 jest.mock('flatpickr', () => { });
 
-const exportServiceStub = {
-  exportToFile: jest.fn(),
-} as unknown as ExportService;
-
 const filterServiceStub = {
   clearFilterByColumnId: jest.fn(),
 } as unknown as FilterService;