TypeScript @angular/core/testing ComponentFixture.detectChanges Examples

Programming Language: TypeScript

Namespace/Package Name: @angular/core/testing

Class/Type: ComponentFixture

Method/Function: detectChanges

Examples at hotexamples.com: 30

The `ComponentFixture` class is used in Angular testing to create a fixture for a component, allowing you to interact with and test the component.

`detectChanges` is a method of the `ComponentFixture` class that triggers a change detection cycle for the component, ensuring that all changes made to the component's properties are reflected in the view.

Example 1:

import { ComponentFixture } from '@angular/core/testing';
import { MyComponent } from './my-component';

describe('MyComponent', () => {
  let component: MyComponent;
  let fixture: ComponentFixture;

  beforeEach(() => {
    TestBed.configureTestingModule({
      declarations: [ MyComponent ]
    })
    .compileComponents();

    fixture = TestBed.createComponent(MyComponent);
    component = fixture.componentInstance;
  });

  it('should update the view when a property is updated', () => {
    // Set the component's property
    component.myProperty = 'new value';

    // Trigger a change detection cycle
    fixture.detectChanges();

    // Verify that the view has been updated
    expect(fixture.nativeElement.querySelector('.property-value').innerText).toEqual('new value');
  });
});

In this example, we create a fixture for the `MyComponent` component, set one of its properties, then call `detectChanges` to trigger a change detection cycle. We then verify that the view has been updated to reflect the new property value.

Example 2:

import { ComponentFixture } from '@angular/core/testing';
import { MyComponent } from './my-component';

describe('MyComponent', () => {
  let component: MyComponent;
  let fixture: ComponentFixture;

  beforeEach(() => {
    // Use the TestBed to create a fixture for the MyComponent component
    TestBed.configureTestingModule({
      declarations: [ MyComponent ]
    });

    fixture = TestBed.createComponent(MyComponent);
    component = fixture.componentInstance;
  });

  it('should call a method when a button is clicked', () => {
    // Create a spy on the component's method we want to test
    const spy = spyOn(component, 'onButtonClick');

    // Click the button in the view
    fixture.nativeElement.querySelector('button').click();

    // Verify that the method was called
    expect(spy).toHaveBeenCalled();
  });
});

In this example, we create a fixture for the `MyComponent` component, set up a spy on one of the component's methods, then simulate a button click in the view. We then verify that the spy was called, indicating that the method was executed.

TypeScript ComponentFixture.detectChanges - 30 examples found. These are the top rated real world TypeScript examples of @angular/core/testing.ComponentFixture.detectChanges extracted from open source projects. You can rate examples to help us improve the quality of examples.

Frequently Used Methods

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detectChanges(30)

isStable(30)

whenStable(30)

autoDetectChanges(13)

whenRenderingDone(2)

checkNoChanges(1)

destroy(1)

Example #1

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File: task-timer-editor.component.spec.ts Project: kensodemann/time-trax

 beforeEach(fakeAsync(() => {
   fixture = TestBed.createComponent(TaskTimerEditorComponent);
   component = fixture.componentInstance;
   fixture.detectChanges();
   tick();
 }));

Example #2

Show file

File: app.component.spec.ts Project: RandyWilkinson/Ng2Sample

 it('should have expected <h1> text', () => {
   fixture.detectChanges();
   const h1 = de.nativeElement;
   expect(h1.innerText).toMatch(/angular/i,
     '<h1> should say something about "Angular"');
 });

Example #3

Show file

File: usertracked.component.spec.ts Project: cruzj6/UpcomingGames

 beforeEach(() => {
   fixture = TestBed.createComponent(UsertrackedComponent);
   component = fixture.componentInstance;
   fixture.detectChanges();
 });

Example #4

Show file

File: rank-recipients-question-response.component.spec.ts Project: TEAMMATES/teammates

 beforeEach(() => {
   fixture = TestBed.createComponent(RankRecipientsQuestionResponseComponent);
   component = fixture.componentInstance;
   fixture.detectChanges();
 });

Example #5

Show file

File: pending-transactions.component.spec.ts Project: iketheadore/skycoin

 beforeEach(() => {
   fixture = TestBed.createComponent(PendingTransactionsComponent);
   component = fixture.componentInstance;
   fixture.detectChanges();
 });

Example #6

Show file

File: project-detail-overview.component.spec.ts Project: lehmamic/EnterpriseApplicationConfigurationManager

 beforeEach(() => {
   fixture = TestBed.createComponent(ProjectDetailOverviewComponent);
   component = fixture.componentInstance;
   fixture.detectChanges();
 });

Example #7

Show file

File: upcomingscholarship.component.spec.ts Project: aqsach/new_cramefrenzy

 beforeEach(() => {
   fixture = TestBed.createComponent(UpcomingscholarshipComponent);
   component = fixture.componentInstance;
   fixture.detectChanges();
 });

Example #8

Show file

File: logout.directive.spec.ts Project: Alfresco/alfresco-ng2-components

 beforeEach(() => {
     router = TestBed.get(Router);
     authService = TestBed.get(AuthenticationService);
     fixture = TestBed.createComponent(TestComponent);
     fixture.detectChanges();
 });

Example #9

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File: explore.component.spec.ts Project: stephenbm/habitat

 it("dispatches a request for data", () => {
   spyOn(actions, "fetchExplore");
   spyOn(store, "dispatch");
   fixture.detectChanges();
   expect(store.dispatch).toHaveBeenCalledWith(actions.fetchExplore());
 });

Example #10

Show file

File: attendance-average-dashboard.component.spec.ts Project: NGO-DB/ndb-core

 beforeEach(() => {
   fixture = TestBed.createComponent(AttendanceAverageDashboardComponent);
   component = fixture.componentInstance;
   fixture.detectChanges();
 });

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