The Karma test runner and it use to writing and
running the unit tests while developing the application. It can be a compulsory
part of the project's development.
The List of Karma Dependencies -
1. karma
2. karma-chrome-launcher
3. karma-cli
4. karma-coverage-istanbul-reporte
5. karma-jasmine
6. karma-jasmine-html-reporter
npm
install --save-dev
<all-of-the-above-dependencies >
You
should Install the Karma CLI globally -
npm
install -g
karma-cli
The package.json
contents should now have the following -
"devDependencies":
{
"@angular/cli":
"1.5.0",
"@angular/compiler-cli":
"^5.0.0",
"@angular/language-service":
"^5.0.0",
"@types/jasmine":
"~2.5.53",
"@types/jasminewd2":
"~2.0.2",
"@types/node":
"~6.0.60",
"codelyzer":
"~3.2.0",
"jasmine-core":
"~2.6.2",
"jasmine-spec-reporter":
"~4.1.0",
"karma":
"~1.7.0",
"karma-chrome-launcher":
"~2.1.1",
"karma-cli":
"~1.0.1",
"karma-coverage-istanbul-reporter":
"^1.2.1",
"karma-jasmine":
"~1.1.0",
"karma-jasmine-html-reporter":
"^0.2.2",
"protractor":
"~5.1.2",
"ts-node":
"~3.2.0",
"tslint":
"~5.7.0",
"typescript":
"~2.4.2"
}
Example
- By Karma and Jasmine in Angular Apps
import
{ TestBed, async
} from '@angular/core/testing';
import
{ AppComponent } from
'./app.component';
describe('AppComponent',
() => {
beforeEach(async(()
=> {
TestBed.configureTestingModule({
declarations: [
AppComponent
],
}).compileComponents();
}));
it('should create the
app', async(()
=> {
const fixture
= TestBed.createComponent(AppComponent);
const app
= fixture.debugElement.componentInstance;
expect(app).toBeTruthy();
}));
it(`should have as
title 'app'`, async(()
=> {
const fixture
= TestBed.createComponent(AppComponent);
const app
= fixture.debugElement.componentInstance;
expect(app.title).toEqual('app');
}));
it('should render
title in a h1 tag', async(()
=> {
const fixture
= TestBed.createComponent(AppComponent);
fixture.detectChanges();
const compiled
= fixture.debugElement.nativeElement;
expect(compiled.querySelector('h1').textContent).toContain('Welcome
to app!');
}));
});
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Anil Singh is an author, tech blogger, and software programmer. Book writing, tech blogging is something do extra and Anil love doing it. For more detail, kindly refer to this link..
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