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distinct-spec.ts
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distinct-spec.ts
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import { expect } from 'chai';
import { distinct, mergeMap, take } from 'rxjs/operators';
import { TestScheduler } from 'rxjs/testing';
import { of, Observable } from 'rxjs';
import { observableMatcher } from '../helpers/observableMatcher';
import { asInteropObservable } from '../helpers/interop-helper';
/** @test {distinct} */
describe('distinct', () => {
let testScheduler: TestScheduler;
beforeEach(() => {
testScheduler = new TestScheduler(observableMatcher);
});
it('should distinguish between values', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--a--a--b--b--a--|');
const e1subs = ' ^-------------------!';
const expected = '--a--------b--------|';
expectObservable(e1.pipe(distinct())).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should distinguish between values and does not complete', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--a--a--b--b--a-');
const e1subs = ' ^------------------';
const expected = '--a--------b-------';
expectObservable(e1.pipe(distinct())).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should not complete if source never completes', () => {
testScheduler.run(({ cold, expectObservable, expectSubscriptions }) => {
const e1 = cold(' -');
const e1subs = ' ^';
const expected = '-';
expectObservable(e1.pipe(distinct())).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should not complete if source does not complete', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' -');
const e1subs = ' ^';
const expected = '-';
expectObservable(e1.pipe(distinct())).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should complete if source is empty', () => {
testScheduler.run(({ cold, expectObservable, expectSubscriptions }) => {
const e1 = cold(' |');
const e1subs = ' (^!)';
const expected = '|';
expectObservable(e1.pipe(distinct())).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should complete if source does not emit', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' ------|');
const e1subs = ' ^-----!';
const expected = '------|';
expectObservable(e1.pipe(distinct())).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should emit if source emits single element only', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--|');
const e1subs = ' ^----!';
const expected = '--a--|';
expectObservable(e1.pipe(distinct())).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should emit if source is scalar', () => {
testScheduler.run(({ expectObservable }) => {
const e1 = of('a');
const expected = '(a|)';
expectObservable(e1.pipe(distinct())).toBe(expected);
});
});
it('should raises error if source raises error', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--a--#');
const e1subs = ' ^-------!';
const expected = '--a-----#';
expectObservable(e1.pipe(distinct())).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should raises error if source throws', () => {
testScheduler.run(({ cold, expectObservable, expectSubscriptions }) => {
const e1 = cold(' # ');
const e1subs = ' (^!)';
const expected = '# ';
expectObservable(e1.pipe(distinct())).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should not omit if source elements are all different', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--b--c--d--e--f--|');
const e1subs = ' ^-------------------!';
const expected = '--a--b--c--d--e--f--|';
expectObservable(e1.pipe(distinct())).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should allow unsubscribing early and explicitly', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--b--b--d--a--f--|');
const e1subs = ' ^---------! ';
const expected = '--a--b----- ';
const unsub = ' ----------! ';
const result = e1.pipe(distinct());
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should not break unsubscription chains when unsubscribed explicitly', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--b--b--d--a--f--|');
const e1subs = ' ^---------! ';
const expected = '--a--b----- ';
const unsub = ' ----------! ';
const result = e1.pipe(
mergeMap((x: any) => of(x)),
distinct(),
mergeMap((x: any) => of(x))
);
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should emit once if source elements are all same', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--a--a--a--a--a--|');
const e1subs = ' ^-------------------!';
const expected = '--a-----------------|';
expectObservable(e1.pipe(distinct())).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should distinguish values by key', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const values = { a: 1, b: 2, c: 3, d: 4, e: 5, f: 6 };
const e1 = hot(' --a--b--c--d--e--f--|', values);
const e1subs = ' ^-------------------!';
const expected = '--a--b--c-----------|';
const selector = (value: number) => value % 3;
expectObservable(e1.pipe(distinct(selector))).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should raises error when selector throws', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--b--c--d--e--f--|');
const e1subs = ' ^----------! ';
const expected = '--a--b--c--# ';
const selector = (value: string) => {
if (value === 'd') {
throw new Error('d is for dumb');
}
return value;
};
expectObservable(e1.pipe(distinct(selector))).toBe(expected, undefined, new Error('d is for dumb'));
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should support a flushing stream', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--b--a--b--a--b--|');
const e1subs = ' ^-------------------!';
const e2 = hot(' -----------x--------|');
const e2subs = ' ^-------------------!';
const expected = '--a--b--------a--b--|';
expectObservable(e1.pipe(distinct(undefined, e2))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
});
it('should support a flushing interop stream', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--b--a--b--a--b--|');
const e1subs = ' ^-------------------!';
const e2 = hot(' -----------x--------|');
const e2subs = ' ^-------------------!';
const expected = '--a--b--------a--b--|';
expectObservable(e1.pipe(distinct(undefined, asInteropObservable(e2)))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
});
it('should raise error if flush raises error', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--b--a--b--a--b--|');
const e1subs = ' ^------------! ';
const e2 = hot(' -----------x-# ');
const e2subs = ' ^------------! ';
const expected = '--a--b-------# ';
expectObservable(e1.pipe(distinct(undefined, e2))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
});
it('should raise error if interop flush raises error', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--b--a--b--a--b--|');
const e1subs = ' ^------------! ';
const e2 = hot(' -----------x-# ');
const e2subs = ' ^------------! ';
const expected = '--a--b-------# ';
expectObservable(e1.pipe(distinct(undefined, asInteropObservable(e2)))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
});
it('should unsubscribe from the flushing stream when the main stream is unsubbed', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--b--a--b--a--b--|');
const e1subs = ' ^----------! ';
const e2 = hot(' -----------x--------|');
const e2subs = ' ^----------! ';
const unsub = ' -----------! ';
const expected = '--a--b------ ';
expectObservable(e1.pipe(distinct(undefined, e2)), unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
});
it('should unsubscribe from the flushing interop stream when the main stream is unsubbed', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--b--a--b--a--b--|');
const e1subs = ' ^----------! ';
const e2 = hot(' -----------x--------|');
const e2subs = ' ^----------! ';
const unsub = ' -----------! ';
const expected = '--a--b------ ';
expectObservable(e1.pipe(distinct(undefined, asInteropObservable(e2))), unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
});
it('should allow opting in to default comparator with flush', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--b--a--b--a--b--|');
const e1subs = ' ^-------------------!';
const e2 = hot(' -----------x--------|');
const e2subs = ' ^-------------------!';
const expected = '--a--b--------a--b--|';
expectObservable(e1.pipe(distinct(undefined, e2))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
});
it('should allow opting in to default comparator with interop flush', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--b--a--b--a--b--|');
const e1subs = ' ^-------------------!';
const e2 = hot(' -----------x--------|');
const e2subs = ' ^-------------------!';
const expected = '--a--b--------a--b--|';
expectObservable(e1.pipe(distinct(undefined, asInteropObservable(e2)))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
});
it('should stop listening to a synchronous observable when unsubscribed', () => {
const sideEffects: number[] = [];
const synchronousObservable = new Observable<number>((subscriber) => {
// This will check to see if the subscriber was closed on each loop
// when the unsubscribe hits (from the `take`), it should be closed
for (let i = 0; !subscriber.closed && i < 10; i++) {
sideEffects.push(i);
subscriber.next(i);
}
});
synchronousObservable.pipe(distinct(), take(3)).subscribe(() => {
/* noop */
});
expect(sideEffects).to.deep.equal([0, 1, 2]);
});
});