[AAE-7817] Show hide columns on datatable (#7580)

* [AAE-7817]  Show hide columns for data-table

* Update

* update tests and uses material harness

* added pipes test

* update

* update

* added tests for datatable

* update

* Added documentation

* Fix for drop column header

* lint fix

* fix lint

lib/core/datatable/directives/main-data-table-action-template.directive.spec.ts

@@ -0,0 +1,44 @@
+/*!
+ * @license
+ * Copyright 2019 Alfresco Software, Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { TestBed, ComponentFixture } from '@angular/core/testing';
+import { DataTableComponent } from '../components/datatable/datatable.component';
+import { MainMenuDataTableTemplateDirective } from './main-data-table-action-template.directive';
+
+describe('MainMenuDataTableTemplateDirective', () => {
+
+    let fixture: ComponentFixture<DataTableComponent>;
+    let dataTable: DataTableComponent;
+    let directive: MainMenuDataTableTemplateDirective;
+
+    beforeEach(() => {
+        fixture = TestBed.createComponent(DataTableComponent);
+        dataTable = fixture.componentInstance;
+        directive = new MainMenuDataTableTemplateDirective(dataTable);
+    });
+
+    afterEach(() => {
+        fixture.destroy();
+    });
+
+    it('applies template to the datatable', () => {
+        const template: any = 'test template';
+        directive.template = template;
+        directive.ngAfterContentInit();
+        expect(dataTable.mainActionTemplate).toBe(template);
+    });
+});