customRxJSOperator.spec.ts

import {extractIdsOfSolvedCases} from './rxjs-operators';
import {marbles} from 'rxjs-marbles';
import {Report} from './reports.service';

describe('rxjs-operators', () => {

  describe('extractIdsOfSolvedCases', () => {

    it('should extract all ids of solved cases', marbles((context) => {
      const source = context.cold('abc|', {
        a: {id: 1, case: {id: 'The Pontiac Bandit'}, detectives: [], solved: false } as Report,
        b: {id: 2, case: {id: 'The Disco Strangler'}, detectives: [], solved: true } as Report,
        c: {id: 3, case: {id: 'Maximum Security'}, detectives: [], solved: true } as Report,
      })
      const destination = source.pipe(
        extractIdsOfSolvedCases()
      );
      context.expect(destination).toBeObservable('---(d|)', {
        d: [2, 3]
      })
    }));
  });
});