@tdb/util/src/libs/libs.test.ts

Shared helpers and utilities.

import { expect } from 'chai';
import { Subject } from 'rxjs';
import { share, takeUntil } from 'rxjs/operators';

describe('libs.rxjs', () => {
  it('piping', () => {
    class Foo {
      private _disposed$ = new Subject();
      private _events$ = new Subject();
      public events$ = this._events$.pipe(
        takeUntil(this._disposed$),
        share(),
      );

      public next() {
        this._events$.next();
      }

      public dispose() {
        this._disposed$.next();
      }
    }
    let count = 0;
    const foo = new Foo();
    foo.events$.subscribe(() => count++);

    foo.next();
    foo.next();
    expect(count).to.eql(2);

    foo.dispose();
    foo.next();
    expect(count).to.eql(2);
  });
});