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test(switchMapTo): add tests for switchMapTo
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/* globals describe, it, expect, cold, hot, expectObservable, expectSubscriptions */ | ||
var Rx = require('../../dist/cjs/Rx'); | ||
var Observable = Rx.Observable; | ||
var immediateScheduler = Rx.Scheduler.immediate; | ||
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describe('Observable.prototype.switchMapTo()', function () { | ||
it('should switch a synchronous many outer to a synchronous many inner', function (done) { | ||
var a = Observable.of(1, 2, 3); | ||
var expected = ['a', 'b', 'c', 'a', 'b', 'c', 'a', 'b', 'c']; | ||
a.switchMapTo(Observable.of('a', 'b', 'c')).subscribe(function (x) { | ||
expect(x).toBe(expected.shift()); | ||
}, null, done); | ||
}); | ||
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it('should unsub inner observables', function () { | ||
var unsubbed = 0; | ||
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Observable.of('a', 'b').switchMapTo( | ||
Observable.create(function (subscriber) { | ||
subscriber.complete(); | ||
return function () { | ||
unsubbed++; | ||
}; | ||
}) | ||
).subscribe(); | ||
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expect(unsubbed).toEqual(2); | ||
}); | ||
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it('should switch to an inner cold observable', function () { | ||
var x = cold( '--a--b--c--d--e--| '); | ||
var xsubs = [' ^ ! ', | ||
// --a--b--c--d--e--| | ||
' ^ !']; | ||
var e1 = hot('---------x---------x---------| '); | ||
var expected = '-----------a--b--c---a--b--c--d--e--|'; | ||
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expectObservable(e1.switchMapTo(x)).toBe(expected); | ||
expectSubscriptions(x.subscriptions).toBe(xsubs); | ||
}); | ||
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it('should switch to an inner cold observable, outer eventually throws', function () { | ||
var x = cold( '--a--b--c--d--e--|'); | ||
var xsubs = ' ^ !'; | ||
var e1 = hot('---------x---------#'); | ||
var expected = '-----------a--b--c-#'; | ||
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expectObservable(e1.switchMapTo(x)).toBe(expected); | ||
expectSubscriptions(x.subscriptions).toBe(xsubs); | ||
}); | ||
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it('should switch to an inner cold observable, outer is unsubscribed early', function () { | ||
var x = cold( '--a--b--c--d--e--| '); | ||
var xsubs = [' ^ ! ', | ||
// --a--b--c--d--e--| | ||
' ^ ! ']; | ||
var e1 = hot('---------x---------x---------|'); | ||
var unsub = ' ! '; | ||
var expected = '-----------a--b--c---a- '; | ||
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expectObservable(e1.switchMapTo(x), unsub).toBe(expected); | ||
expectSubscriptions(x.subscriptions).toBe(xsubs); | ||
}); | ||
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it('should switch to an inner cold observable, inner never completes', function () { | ||
var x = cold( '--a--b--c--d--e- '); | ||
var xsubs = [' ^ ! ', | ||
// --a--b--c--d--e- | ||
' ^ ']; | ||
var e1 = hot('---------x---------y---------|'); | ||
var expected = '-----------a--b--c---a--b--c--d--e-'; | ||
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expectObservable(e1.switchMapTo(x)).toBe(expected); | ||
expectSubscriptions(x.subscriptions).toBe(xsubs); | ||
}); | ||
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it('should handle a synchronous switch to the inner observable', function () { | ||
var x = cold( '--a--b--c--d--e--| '); | ||
var xsubs = [' (^!) ', | ||
' ^ ! ']; | ||
var e1 = hot('---------(xx)----------------|'); | ||
var expected = '-----------a--b--c--d--e-----|'; | ||
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expectObservable(e1.switchMapTo(x)).toBe(expected); | ||
expectSubscriptions(x.subscriptions).toBe(xsubs); | ||
}); | ||
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it('should switch to an inner cold observable, inner raises an error', function () { | ||
var x = cold( '--a--b--#'); | ||
var xsubs = ' ^ !'; | ||
var e1 = hot('---------x---------x---------|'); | ||
var expected = '-----------a--b--#'; | ||
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expectObservable(e1.switchMapTo(x)).toBe(expected); | ||
expectSubscriptions(x.subscriptions).toBe(xsubs); | ||
}); | ||
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it('should switch an inner hot observable', function () { | ||
var x = hot('--p-o-o-p---a--b--c--d-| '); | ||
var xsubs = [' ^ ! ', | ||
' ^ ! ']; | ||
var e1 = hot('---------x---------x---------|'); | ||
var expected = '------------a--b--c--d-------|'; | ||
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expectObservable(e1.switchMapTo(x)).toBe(expected); | ||
expectSubscriptions(x.subscriptions).toBe(xsubs); | ||
}); | ||
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it('should switch to an inner empty', function () { | ||
var x = cold('|'); | ||
var xsubs = [' (^!) ', | ||
' (^!) ']; | ||
var e1 = hot('---------x---------x---------|'); | ||
var expected = '-----------------------------|'; | ||
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expectObservable(e1.switchMapTo(x)).toBe(expected); | ||
expectSubscriptions(x.subscriptions).toBe(xsubs); | ||
}); | ||
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it('should switch to an inner never', function () { | ||
var x = cold('-'); | ||
var xsubs = [' ^ ! ', | ||
' ^ ']; | ||
var e1 = hot('---------x---------x---------|'); | ||
var expected = '----------------------------------'; | ||
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expectObservable(e1.switchMapTo(x)).toBe(expected); | ||
expectSubscriptions(x.subscriptions).toBe(xsubs); | ||
}); | ||
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it('should switch to an inner that just raises an error', function () { | ||
var x = cold('#'); | ||
var xsubs = ' (^!)'; | ||
var e1 = hot('---------x---------x---------|'); | ||
var expected = '---------#'; | ||
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expectObservable(e1.switchMapTo(x)).toBe(expected); | ||
expectSubscriptions(x.subscriptions).toBe(xsubs); | ||
}); | ||
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it('should handle an empty outer', function () { | ||
var e1 = cold( '|'); | ||
var expected = '|'; | ||
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expectObservable(e1.switchMapTo(Observable.of('foo'))).toBe(expected); | ||
}); | ||
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it('should handle a never outer', function () { | ||
var e1 = cold( '-'); | ||
var expected = '-'; | ||
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expectObservable(e1.switchMapTo(Observable.of('foo'))).toBe(expected); | ||
}); | ||
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it('should handle an outer that just raises and error', function () { | ||
var e1 = cold( '#'); | ||
var expected = '#'; | ||
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expectObservable(e1.switchMapTo(Observable.of('foo'))).toBe(expected); | ||
}); | ||
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it('should switch with resultSelector goodness', function () { | ||
var x = cold( '--1--2--3--4--5--| '); | ||
var xsubs = [' ^ ! ', | ||
// --1--2--3--4--5--| | ||
' ^ !']; | ||
var e1 = hot('---------x---------y---------| '); | ||
var expected = '-----------a--b--c---d--e--f--g--h--|'; | ||
var expectedValues = { | ||
a: ['x', '1', 0, 0], | ||
b: ['x', '2', 0, 1], | ||
c: ['x', '3', 0, 2], | ||
d: ['y', '1', 1, 0], | ||
e: ['y', '2', 1, 1], | ||
f: ['y', '3', 1, 2], | ||
g: ['y', '4', 1, 3], | ||
h: ['y', '5', 1, 4] | ||
}; | ||
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var result = e1.switchMapTo(x, function (a, b, ai, bi) { | ||
return [a, b, ai, bi]; | ||
}); | ||
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expectObservable(result).toBe(expected, expectedValues); | ||
expectSubscriptions(x.subscriptions).toBe(xsubs); | ||
}); | ||
}); |