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import { fakeAsync, TestBed, tick } from '@angular/core/testing';
import { of, Subscription } from 'rxjs';
import { configureTestBed } from '~/testing/unit-test-helper';
import { TimerService } from './timer.service';
describe('TimerService', () => {
let service: TimerService;
let subs: Subscription;
let receivedData: any[];
const next = () => of(true);
const observer = (data: boolean) => {
receivedData.push(data);
};
configureTestBed({
providers: [TimerService]
});
beforeEach(() => {
service = TestBed.inject(TimerService);
receivedData = [];
});
it('should be created', () => {
expect(service).toBeTruthy();
});
it('should not emit any value when no subscribers', fakeAsync(() => {
subs = service.get(next).subscribe(observer);
tick(service.DEFAULT_REFRESH_INTERVAL);
expect(receivedData.length).toEqual(2);
subs.unsubscribe();
tick(service.DEFAULT_REFRESH_INTERVAL);
expect(receivedData.length).toEqual(2);
}));
it('should emit value with no dueTime and no refresh interval', fakeAsync(() => {
subs = service.get(next, null, null).subscribe(observer);
tick(service.DEFAULT_REFRESH_INTERVAL);
expect(receivedData.length).toEqual(1);
expect(receivedData).toEqual([true]);
subs.unsubscribe();
}));
it('should emit expected values when refresh interval + no dueTime', fakeAsync(() => {
subs = service.get(next).subscribe(observer);
tick(service.DEFAULT_REFRESH_INTERVAL * 2);
expect(receivedData.length).toEqual(3);
expect(receivedData).toEqual([true, true, true]);
subs.unsubscribe();
}));
it('should emit expected values when dueTime equal to refresh interval', fakeAsync(() => {
const dueTime = 1000;
subs = service.get(next, service.DEFAULT_REFRESH_INTERVAL, dueTime).subscribe(observer);
tick(service.DEFAULT_REFRESH_INTERVAL * 2);
expect(receivedData.length).toEqual(2);
expect(receivedData).toEqual([true, true]);
subs.unsubscribe();
}));
});
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