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Subscription-spec.ts
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Subscription-spec.ts
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import { expect } from 'chai';
import { Observable, UnsubscriptionError, Subscription, merge } from 'rxjs';
/** @test {Subscription} */
describe('Subscription', () => {
describe('add()', () => {
it('should unsubscribe child subscriptions', () => {
const main = new Subscription();
let isCalled = false;
const child = new Subscription(() => {
isCalled = true;
});
main.add(child);
main.unsubscribe();
expect(isCalled).to.equal(true);
});
it('should unsubscribe child subscriptions if it has already been unsubscribed', () => {
const main = new Subscription();
main.unsubscribe();
let isCalled = false;
const child = new Subscription(() => {
isCalled = true;
});
main.add(child);
expect(isCalled).to.equal(true);
});
it('should unsubscribe a finalizer function that was passed', () => {
let isCalled = false;
const main = new Subscription();
main.add(() => {
isCalled = true;
});
main.unsubscribe();
expect(isCalled).to.be.true;
});
it('should unsubscribe a finalizer function that was passed immediately if it has been unsubscribed', () => {
let isCalled = false;
const main = new Subscription();
main.unsubscribe();
main.add(() => {
isCalled = true;
});
expect(isCalled).to.be.true;
});
it('should unsubscribe an Unsubscribable when unsubscribed', () => {
let isCalled = false;
const main = new Subscription();
main.add({
unsubscribe() {
isCalled = true;
}
});
main.unsubscribe();
expect(isCalled).to.be.true;
});
it('should unsubscribe an Unsubscribable if it is already unsubscribed', () => {
let isCalled = false;
const main = new Subscription();
main.unsubscribe();
main.add({
unsubscribe() {
isCalled = true;
}
});
expect(isCalled).to.be.true;
});
});
describe('remove()', () => {
it('should remove added Subscriptions', () => {
let isCalled = false;
const main = new Subscription();
const child = new Subscription(() => {
isCalled = true;
});
main.add(child);
main.remove(child);
main.unsubscribe();
expect(isCalled).to.be.false;
});
it('should remove added functions', () => {
let isCalled = false;
const main = new Subscription();
const finalizer = () => {
isCalled = true;
};
main.add(finalizer);
main.remove(finalizer);
main.unsubscribe();
expect(isCalled).to.be.false;
});
it('should remove added unsubscribables', () => {
let isCalled = false;
const main = new Subscription();
const unsubscribable = {
unsubscribe() {
isCalled = true;
}
}
main.add(unsubscribable);
main.remove(unsubscribable);
main.unsubscribe();
expect(isCalled).to.be.false;
});
});
describe('unsubscribe()', () => {
it('should unsubscribe from all subscriptions, when some of them throw', (done) => {
const finalizers: number[] = [];
const source1 = new Observable(() => {
return () => {
finalizers.push(1);
};
});
const source2 = new Observable(() => {
return () => {
finalizers.push(2);
throw new Error('oops, I am a bad unsubscribe!');
};
});
const source3 = new Observable(() => {
return () => {
finalizers.push(3);
};
});
const subscription = merge(source1, source2, source3).subscribe();
setTimeout(() => {
expect(() => {
subscription.unsubscribe();
}).to.throw(UnsubscriptionError);
expect(finalizers).to.deep.equal([1, 2, 3]);
done();
});
});
it('should unsubscribe from all subscriptions, when adding a bad custom subscription to a subscription', (done) => {
const finalizers: number[] = [];
const sub = new Subscription();
const source1 = new Observable(() => {
return () => {
finalizers.push(1);
};
});
const source2 = new Observable(() => {
return () => {
finalizers.push(2);
sub.add(<any>({
unsubscribe: () => {
expect(sub.closed).to.be.true;
throw new Error('Who is your daddy, and what does he do?');
}
}));
};
});
const source3 = new Observable(() => {
return () => {
finalizers.push(3);
};
});
sub.add(merge(source1, source2, source3).subscribe());
setTimeout(() => {
expect(() => {
sub.unsubscribe();
}).to.throw(UnsubscriptionError);
expect(finalizers).to.deep.equal([1, 2, 3]);
done();
});
});
it('should have idempotent unsubscription', () => {
let count = 0;
const subscription = new Subscription(() => ++count);
expect(count).to.equal(0);
subscription.unsubscribe();
expect(count).to.equal(1);
subscription.unsubscribe();
expect(count).to.equal(1);
});
it('should unsubscribe from all parents', () => {
// https://github.com/ReactiveX/rxjs/issues/6351
const a = new Subscription(() => { /* noop */});
const b = new Subscription(() => { /* noop */});
const c = new Subscription(() => { /* noop */});
const d = new Subscription(() => { /* noop */});
a.add(d);
b.add(d);
c.add(d);
// When d is added to the subscriptions, it's added as a finalizer. The
// length is 1 because the finalizers passed to the ctors are stored in a
// separate property.
expect((a as any)._finalizers).to.have.length(1);
expect((b as any)._finalizers).to.have.length(1);
expect((c as any)._finalizers).to.have.length(1);
d.unsubscribe();
// When d is unsubscribed, it should remove itself from each of its
// parents.
expect((a as any)._finalizers).to.have.length(0);
expect((b as any)._finalizers).to.have.length(0);
expect((c as any)._finalizers).to.have.length(0);
});
});
});