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What Is Jasmine? Why Use Jasmine In Angular?

The Jasmine is a test framework provides for JavaScript to write tests and the aim of Jasmine to run on any JavaScript enabled platform like AngularJs, Angular, and Node.js and so on.

It is easy to read and write the tests and this test runner executes tests in the browsers.

The Jasmine previously developed a similar unit testing framework called JsUnit.
ü  Stayed Informed - What Is Karma? Why Use Karma In Angular?

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"
  }

Jasmine provides a rich set of Pre-defined Matchers - default set of matchers
1.     expect(number).toBeGreaterThan(number);
2.     expect(number).toBeLessThan(number);
3.     expect(array).toContain(member);
4.     expect(array).toBeArray();
5.     expect(fn).toThrow(string);
6.     expect(fn).toThrowError(string);
7.     expect(instance).toBe(instance); represents the exact equality (===) operator.
8.     expect(mixed).toBeDefined();
9.     expect(mixed).toBeFalsy();
10.  expect(mixed).toBeNull();
11.  expect(mixed).toBeTruthy();
12.  expect(mixed).toBeUndefined();
13.  expect(mixed).toEqual(mixed);   represents the regular equality (==) operator.
14.  expect(mixed).toMatch(pattern);  calls the RegExp match() method behind the scenes to compare string data.
15.  expect(number).toBeCloseTo(number, decimalPlaces);
16.  expect(number).toBeNaN();
17.  expect(spy).toHaveBeenCalled();
18.  expect(spy).toHaveBeenCalledTimes(number);
19.  expect(date).toBeAfter(otherDate);
20.  expect(date).toBeBefore(otherDate);
21.  expect(date).toBeDate();
22.  expect(date).toBeValidDate();
23.  expect(object).toHaveDate(memberName);
24.  expect(object).toHaveDateAfter(memberName, date);
25.  expect(object).toHaveDateBefore(memberName, date);
26.  expect(regexp).toBeRegExp();
27.  expect(string).toBeEmptyString();
28.  expect(string).toBeHtmlString();
29.  expect(string).toBeIso8601();
30.  expect(string).toBeJsonString();
31.  expect(string).toBeLongerThan();
32.  expect(string).toBeString();

Default set of Asymmetric Matchers-
1.     jasmine.any(Constructor);
2.     jasmine.anything(mixed);
3.     jasmine.arrayContaining(mixed);
4.     jasmine.objectContaining(mixed);
5.     jasmine.stringMatching(pattern);

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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