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How to write unit test case for Angular 2 Reactive forms by using Karma/Jasmine?

I have develop a simple reactive form in angular 2, Which includes username, password and login button. Here button default disable up to getting email and password values. Here i am trying to write a test case for button enable by using karma/Jasmine, But i am new to this testing framework, I have written normal valid and invalid things,but not getting clarity to write this particular thing . If any one aware of this, could you please help me to quick start.

This is my reactive form:

<nb-card *ngIf="!loading" >
<nb-card-header>
<i class="fa fa-lock"></i>Sign In Form </nb-card-header>
<nb-card-body>
<form [formGroup]="authForm" (ngSubmit)="onLogin()" >
<input id="userid" type="text" class="bx--text-input" placeholder="EOSE Userid"
formControlName="userid" [attr.data-invalid]="useridMessage ? '' : null"/>

<div class="bx--form-requirement" *ngIf="useridMessage"> useridMessage </div>
<br>
<input id="password" type="password" class="bx--text-input" placeholder="EOSE Password"
formControlName="password" [attr.data-invalid]="passwordMessage ? '' : null"/>
<div class="bx--form-requirement" *ngIf="passwordMessage" > passwordMessage </div>

<br>
<carbon-button type="primary" [disabled]="!authForm.valid">Sign In</carbon-button>
</form>
</nb-card-body>
</nb-card>

This is my .spec file.

beforeEach(() =>
fixture = TestBed.createComponent(LoginFormComponent);
component = fixture.componentInstance;
fixture.detectChanges();
);

it('should create the app', async(() =>
const fixture = TestBed.createComponent(LoginFormComponent);
const app = fixture.debugElement.componentInstance;
expect(app).toBeTruthy();
));
it('form should be invalid', async(() =>
component.authForm.controls['userid'].setValue('');
component.authForm.controls['password'].setValue('');
expect(component.authForm.valid).toBeFalsy();
));

1 Answer
1

Test case to check if button is disabled or not

it('form should be invalid', async(() =>
component.authForm.controls['userid'].setValue('');
component.authForm.controls['password'].setValue('');
expect(component.authForm.valid).toBeFalsy();

// update view, once the values are entered
fixture.detectChanges();
let btn = fixture.debugElement.query(By.css('carbon-button')); // fetch button element
expect(btn.nativeElement.disabled).toBeTruthy(); // check if it is disabled
));


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