25 lines
1009 B
Lua
25 lines
1009 B
Lua
describe('takeWhile', function()
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it('produces an error if its parent errors', function()
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local observable = Rx.Observable.fromValue(''):map(function(x) return x() end)
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expect(observable.subscribe).to.fail()
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expect(observable:takeWhile(function() end).subscribe).to.fail()
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end)
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it('uses the identity function if no predicate is specified', function()
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local observable = Rx.Observable.fromTable({true, true, false}):takeWhile()
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expect(observable).to.produce(true, true)
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end)
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it('stops producing values once the predicate returns false', function()
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local function isEven(x) return x % 2 == 0 end
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local observable = Rx.Observable.fromTable({2, 3, 4}, ipairs):takeWhile(isEven)
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expect(observable).to.produce(2)
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end)
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it('produces no values if the predicate never returns true', function()
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local function isEven(x) return x % 2 == 0 end
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local observable = Rx.Observable.fromTable({1, 3, 5}):takeWhile(isEven)
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expect(observable).to.produce({})
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end)
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end)
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