66 lines
2.5 KiB
Lua
66 lines
2.5 KiB
Lua
describe('combineLatest', function()
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it('returns the observable it is called on if only the identity function is passed as an argument', function()
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local observable = Rx.Observable.fromRange(1, 5):combineLatest(function(x) return x end)
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expect(observable).to.produce(1, 2, 3, 4, 5)
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end)
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it('calls the combinator function with all values produced from all input observables once they have all produced a value', function()
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local observableA = Rx.Observable.of('a')
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local observableB = Rx.Observable.of('b')
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local observableC = Rx.Observable.of('c')
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local combinator = spy()
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Rx.Observable.combineLatest(observableA, observableB, observableC, function(...) combinator(...) end):subscribe()
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expect(combinator).to.equal({{'a', 'b', 'c'}})
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end)
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it('emits the return value of the combinator as values', function()
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local observableA = Rx.Subject.create()
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local observableB = Rx.Subject.create()
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local onNext = spy()
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Rx.Observable.combineLatest(observableA, observableB, function(a, b) return a + b end):subscribe(Rx.Observer.create(onNext))
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expect(#onNext).to.equal(0)
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observableA:onNext(1)
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observableB:onNext(2)
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observableB:onNext(3)
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observableA:onNext(4)
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expect(onNext).to.equal({{3}, {4}, {7}})
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end)
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it('calls onCompleted once all sources complete', function()
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local observableA = Rx.Subject.create()
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local observableB = Rx.Subject.create()
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local complete = spy()
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Rx.Observable.combineLatest(observableA, observableB, function() end):subscribe(nil, nil, complete)
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expect(#complete).to.equal(0)
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observableA:onNext(1)
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expect(#complete).to.equal(0)
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observableB:onNext(2)
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expect(#complete).to.equal(0)
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observableB:onCompleted()
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expect(#complete).to.equal(0)
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observableA:onCompleted()
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expect(#complete).to.equal(1)
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end)
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it('calls onError if one source errors', function()
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local observableA = Rx.Subject.create()
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local observableB = Rx.Subject.create()
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local errored = spy()
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Rx.Observable.combineLatest(observableA, observableB, function() end):subscribe(nil, errored)
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expect(#errored).to.equal(0)
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observableB:onError()
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expect(#errored).to.equal(1)
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end)
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it('calls onError if the combinator is absent', function()
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expect(Rx.Observable.combineLatest(Rx.Observable.fromRange(3)).subscribe).to.fail()
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end)
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it('calls onError if the combinator errors', function()
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local onError = spy()
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Rx.Observable.combineLatest(Rx.Observable.fromRange(3), error):subscribe(nil, onError, nil)
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expect(#onError).to.equal(1)
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end)
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end)
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