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// RUN: %target-run-stdlib-swift
// REQUIRES: executable_test
import StdlibUnittest
import StdlibCollectionUnittest
var tests = TestSuite("Iterator")
// Check to make sure we are actually getting Optionals out of this
// IteratorProtocol
tests.test("Range") {
var w = (1..<2).makeIterator()
var maybe_one = w.next()
expectType(Optional<Int>.self, &maybe_one)
expectEqual(1, maybe_one)
expectNil(w.next())
}
tests.test("RangeIteratorConformsToSequence") {
for x in (1..<2).makeIterator() {
expectEqual(1, x)
}
}
// Test round-trip IteratorProtocol/IteratorProtocol adaptation
tests.test("IteratorSequence") {
var r = 1..<7
var x = MinimalIterator(Array(r))
var rangeIndex = r.lowerBound
for a in IteratorSequence(x) {
expectEqual(rangeIndex, a)
rangeIndex = r.index(after: rangeIndex)
}
expectEqual(rangeIndex, r.upperBound)
}
struct MyIterator : IteratorProtocol {
var i = 0
mutating func next() -> Int? {
if i >= 10 { return nil }
i += 1
return i-1
}
}
extension MyIterator : Sequence {}
tests.test("IteratorsModelSequenceByDeclaration") {
var n = 0
for i in MyIterator() {
expectEqual(n, i)
n += 1
}
}
runAllTests()
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