forked from ReactiveX/rxjs
/
reduce-spec.ts
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/
reduce-spec.ts
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import { expect } from 'chai';
import { hot, cold, expectObservable, expectSubscriptions } from '../helpers/marble-testing';
import { reduce, mergeMap } from 'rxjs/operators';
import { range, of, Observable } from 'rxjs';
declare const type: Function;
declare const asDiagram: Function;
/** @test {reduce} */
describe('reduce operator', () => {
asDiagram('reduce((acc, curr) => acc + curr, 0)')('should reduce', () => {
const values = {
a: 1, b: 3, c: 5, x: 9
};
const e1 = hot('--a--b--c--|', values);
const e1subs = '^ !';
const expected = '-----------(x|)';
const reduceFunction = function (o: number, x: number) {
return o + x;
};
expectObservable(e1.pipe(reduce(reduceFunction, 0))).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should reduce with seed', () => {
const e1 = hot('--a--b--|');
const e1subs = '^ !';
const expected = '--------(x|)';
const seed = 'n';
const reduceFunction = function (o: string, x: string) {
return o + x;
};
expectObservable(e1.pipe(reduce(reduceFunction, seed))).toBe(expected, {x: seed + 'ab'});
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should reduce with a seed of undefined', () => {
const e1 = hot('--a--^--b--c--d--e--f--g--|');
const e1subs = '^ !';
const expected = '---------------------(x|)';
const values = {
x: 'undefined b c d e f g'
};
const source = e1.pipe(reduce((acc: any, x: string) => acc + ' ' + x, undefined));
expectObservable(source).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should reduce without a seed', () => {
const e1 = hot('--a--^--b--c--d--e--f--g--|');
const e1subs = '^ !';
const expected = '---------------------(x|)';
const values = {
x: 'b c d e f g'
};
const source = e1.pipe(reduce((acc: any, x: string) => acc + ' ' + x));
expectObservable(source).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should reduce with index without seed', (done: MochaDone) => {
const idx = [1, 2, 3, 4, 5];
range(0, 6).pipe(reduce((acc, value, index) => {
expect(idx.shift()).to.equal(index);
return value;
})).subscribe(null, null, () => {
expect(idx).to.be.empty;
done();
});
});
it('should reduce with index with seed', (done: MochaDone) => {
const idx = [0, 1, 2, 3, 4, 5];
range(0, 6).pipe(reduce((acc, value, index) => {
expect(idx.shift()).to.equal(index);
return value;
}, -1)).subscribe(null, null, () => {
expect(idx).to.be.empty;
done();
});
});
it('should reduce with seed if source is empty', () => {
const e1 = hot('--a--^-------|');
const e1subs = '^ !';
const expected = '--------(x|)';
const expectedValue = '42';
const reduceFunction = function (o: string, x: string) {
return o + x;
};
expectObservable(e1.pipe(reduce(reduceFunction, expectedValue))).toBe(expected, {x: expectedValue});
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error if reduce function throws without seed', () => {
const e1 = hot('--a--b--|');
const e1subs = '^ ! ';
const expected = '-----# ';
const reduceFunction = function (o: string, x: string) {
throw 'error';
};
expectObservable(e1.pipe(reduce(reduceFunction))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should allow unsubscribing explicitly and early', () => {
const e1 = hot('--a--b--|');
const unsub = ' ! ';
const e1subs = '^ ! ';
const expected = '------- ';
const reduceFunction = function (o: string, x: string) {
return o + x;
};
const result = e1.pipe(reduce(reduceFunction));
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not break unsubscription chains when result is unsubscribed explicitly', () => {
const e1 = hot('--a--b--|');
const e1subs = '^ ! ';
const expected = '------- ';
const unsub = ' ! ';
const reduceFunction = function (o: string, x: string) {
return o + x;
};
const result = e1.pipe(
mergeMap((x: string) => of(x)),
reduce(reduceFunction),
mergeMap((x: string) => of(x))
);
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error if source emits and raises error with seed', () => {
const e1 = hot('--a--b--#');
const e1subs = '^ !';
const expected = '--------#';
const expectedValue = '42';
const reduceFunction = function (o: string, x: string) {
return o + x;
};
expectObservable(e1.pipe(reduce(reduceFunction, expectedValue))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error if source raises error with seed', () => {
const e1 = hot('----#');
const e1subs = '^ !';
const expected = '----#';
const expectedValue = '42';
const reduceFunction = function (o: string, x: string) {
return o + x;
};
expectObservable(e1.pipe(reduce(reduceFunction, expectedValue))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error if reduce function throws with seed', () => {
const e1 = hot('--a--b--|');
const e1subs = '^ ! ';
const expected = '--# ';
const seed = 'n';
const reduceFunction = function (o: string, x: string) {
throw 'error';
};
expectObservable(e1.pipe(reduce(reduceFunction, seed))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not complete with seed if source emits but does not completes', () => {
const e1 = hot('--a--');
const e1subs = '^ ';
const expected = '-----';
const seed = 'n';
const reduceFunction = function (o: string, x: string) {
return o + x;
};
expectObservable(e1.pipe(reduce(reduceFunction, seed))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not complete with seed if source never completes', () => {
const e1 = cold('-');
const e1subs = '^';
const expected = '-';
const seed = 'n';
const reduceFunction = function (o: string, x: string) {
return o + x;
};
expectObservable(e1.pipe(reduce(reduceFunction, seed))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not complete without seed if source emits but does not completes', () => {
const e1 = hot('--a--b--');
const e1subs = '^ ';
const expected = '--------';
const reduceFunction = function (o: string, x: string) {
return o + x;
};
expectObservable(e1.pipe(reduce(reduceFunction))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not complete without seed if source never completes', () => {
const e1 = cold('-');
const e1subs = '^';
const expected = '-';
const reduceFunction = function (o: string, x: string) {
return o + x;
};
expectObservable(e1.pipe(reduce(reduceFunction))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should reduce if source does not emit without seed', () => {
const e1 = hot('--a--^-------|');
const e1subs = '^ !';
const expected = '--------|';
const reduceFunction = function (o: string, x: string) {
return o + x;
};
expectObservable(e1.pipe(reduce(reduceFunction))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error if source emits and raises error without seed', () => {
const e1 = hot('--a--b--#');
const e1subs = '^ !';
const expected = '--------#';
const reduceFunction = function (o: string, x: string) {
return o + x;
};
expectObservable(e1.pipe(reduce(reduceFunction))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error if source raises error without seed', () => {
const e1 = hot('----#');
const e1subs = '^ !';
const expected = '----#';
const reduceFunction = function (o: string, x: string) {
return o + x;
};
expectObservable(e1.pipe(reduce(reduceFunction))).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});