25 lines
970 B
Lua
25 lines
970 B
Lua
describe('filter', function()
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it('uses the identity function as the predicate if none is specified', function()
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local observable = Rx.Observable.fromTable({false, true}):filter()
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expect(observable).to.produce(true)
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end)
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it('passes all arguments to the predicate', function()
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local predicate = spy()
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Rx.Observable.fromTable({{1, 2}, {3, 4, 5}}, ipairs):unpack():filter(predicate):subscribe()
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expect(predicate).to.equal({{1, 2}, {3, 4, 5}})
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end)
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it('does not produce elements that the predicate returns false for', function()
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local predicate = function(x) return x % 2 == 0 end
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local observable = Rx.Observable.fromRange(1, 5):filter(predicate)
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expect(observable).to.produce(2, 4)
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end)
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it('errors when 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:filter().subscribe).to.fail()
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end)
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end)
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