class Test

	def main
		.testNumberedP1
		.testNumberedP2
		.testNumberedKVP

	def numberedP1 as Pair<of int>*
		yield Pair<of int>(0, 1)
		yield Pair<of int>(1, 2)

	def numberedP2 as Pair<of int, String>*
		yield Pair<of int, String>(0, 'a')
		yield Pair<of int, String>(1, 'b')

	def numberedKVP as KeyValuePair<of int, String>*
		yield KeyValuePair<of int, String>(0, 'a')
		yield KeyValuePair<of int, String>(1, 'b')

	def testNumberedP1
		count = 0
		for i, j in .numberedP1
			assert i in [0, 1]
			assert j in [0, 1, 2]
			assert (i==0 and j==1) or (i==1 and j==2)
			count += 1
		assert count == 2

	def testNumberedP2
		count = 0
		for i, s in .numberedP2
			assert i in [0, 1]
			assert s in ['a', 'b']
			assert (i==0 and s=='a') or (i==1 and s=='b')
			count += 1
		assert count == 2

	def testNumberedKVP
		count = 0
		for i, s in .numberedKVP
			assert i in [0, 1]
			assert s in ['a', 'b']
			assert (i==0 and s=='a') or (i==1 and s=='b')
			count += 1
		assert count == 2