Exploring Angular Unit Testing: A Beginner's Guide to Running a Simple Test

I'm diving into the world of angular unit testing and looking to set up my first successful test. Here's what I've come up with:

import { async, ComponentFixture, TestBed } from '@angular/core/testing';
import { AppComponent } from './app.component';

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

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

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

  it('first test', () => {
    expect('1').toBe('1');
  });
});

As you can see, my initial test is a simple assertion that "1" equals "1". However, I'm encountering an error that says:

Error: Template parse errors:   Can't bind to 'min' since it isn't a known property of 'dx-progress-bar'.
    1. If 'dx-progress-bar' is an Angular component and it has 'min' input, then verify that it is part of this module.
    2. If 'dx-progress-bar' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.
    3. To allow any property add 'NO_ERRORS_SCHEMA' to the '@NgModule.schemas' of this component. ("
        width="100%"
        [class.complete]="progressBar.value == maxValue"
        [ERROR ->][min]="0"
        [max]="maxValue"
        [statusFormat]="wordProgression"    "): ng:///DynamicTestModule/AppComponent.html@15:4

Although I am using DevExtreme widgets in my app component, I haven't attempted to test them yet. I'm focusing on basic test cases for now.

Any suggestions on how I should go about fixing this issue?

Open to Suggestions!

Answer №1

When setting up your component in TestBed.configureTestingModule, be sure to include all necessary imports:

// import { DevExtremeModule } from 'devextreme-angular';
import { DxProgressBarModule } from 'devextreme-angular/ui/progress-bar';


TestBed.configureTestingModule({
  imports: [
    DxProgressBarModule,
    // or DevExtremeModule
  ],
  declarations: [ AppComponent ],
}).compileComponents();

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