feat: add tests for individual column filter component

Author: shanmukhateja

demo/src/app/advanced/individual-column-filtering.component.spec.ts

@@ -0,0 +1,99 @@
+/* tslint:disable:no-unused-variable */
+
+import { RouterTestingModule } from '@angular/router/testing';
+import { HttpClientModule } from '@angular/common/http';
+import { NO_ERRORS_SCHEMA, SecurityContext } from '@angular/core';
+import { ComponentFixture, TestBed, waitForAsync } from '@angular/core/testing';
+import { DataTableDirective, DataTablesModule } from 'angular-datatables';
+import { MarkdownModule } from 'ngx-markdown';
+import { BaseDemoComponent } from '../base-demo/base-demo.component';
+import { AppRoutingModule } from '../app.routing';
+import { By } from '@angular/platform-browser';
+import { FormsModule } from '@angular/forms';
+import { IndividualColumnFilteringComponent } from './individual-column-filtering.component';
+
+
+let fixture: ComponentFixture<IndividualColumnFilteringComponent>, component: IndividualColumnFilteringComponent = null;
+
+function applyValueToInput(inputElement: HTMLInputElement, value: string, table: DataTables.Api) {
+  inputElement.value = value;
+  inputElement.dispatchEvent(new Event('input'));
+  inputElement.dispatchEvent(new Event('change'));
+  table.draw();
+}
+
+describe('IndividualColumnFilteringComponent', () => {
+  beforeEach(() => {
+    fixture = TestBed.configureTestingModule({
+      declarations: [
+        BaseDemoComponent,
+        IndividualColumnFilteringComponent,
+        DataTableDirective
+      ],
+      imports: [
+        AppRoutingModule,
+        RouterTestingModule,
+        DataTablesModule.forRoot(),
+        HttpClientModule,
+        MarkdownModule.forRoot(
+          {
+            sanitize: SecurityContext.NONE
+          }
+        ),
+        FormsModule
+      ],
+      schemas: [NO_ERRORS_SCHEMA]
+    }).createComponent(IndividualColumnFilteringComponent);
+
+    component = fixture.componentInstance;
+
+    fixture.detectChanges(); // initial binding
+  });
+
+  it('should create the app', waitForAsync(() => {
+    const app = fixture.debugElement.componentInstance;
+    expect(app).toBeTruthy();
+  }));
+
+  it('should have title "Individual column searching"', waitForAsync(() => {
+    const app = fixture.debugElement.componentInstance as IndividualColumnFilteringComponent;
+    expect(app.pageTitle).toBe('Individual column searching');
+  }));
+
+  it('should filter contents acc. to column', async () => {
+    const app = fixture.componentInstance as IndividualColumnFilteringComponent;
+    app.dtOptions.paging = false;
+
+    await fixture.whenStable();
+
+    const query = fixture.debugElement.query(By.directive(DataTableDirective));
+    const dir = query.injector.get(DataTableDirective);
+    expect(dir).toBeTruthy();
+
+    const instance = await dir.dtInstance;
+
+    const inputFields = Array.from(fixture.nativeElement.querySelectorAll('input')) as HTMLInputElement[];
+    const inputFieldID = inputFields.find(e => e.name == "search-id");
+    const inputFieldFirstName = inputFields.find(e => e.name == "search-first-name");
+    const inputFieldLastName = inputFields.find(e => e.name == "search-last-name");
+
+    // # Test 1
+    applyValueToInput(inputFieldID, '113', instance);
+    expect(instance.rows({ page: 'current' }).count()).toBe(1);
+
+    // # Test 2
+
+    // reset prev. field
+    applyValueToInput(inputFieldID, '', instance);
+    applyValueToInput(inputFieldFirstName, 'Batman', instance);
+    expect(instance.rows({ page: 'current' }).count()).toBe(30);
+
+    // # Test 3
+    // reset prev. field
+    applyValueToInput(inputFieldFirstName, '', instance);
+    applyValueToInput(inputFieldLastName, 'Titi', instance);
+    expect(instance.rows({ page: 'current' }).count()).toBe(28);
+
+  });
+
+});