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##
# Enumerator::Chain test
assert("Enumerable#chain") do
a = []
b = {}
c = Object.new # not has #each method
assert_kind_of Enumerator::Chain, a.chain
assert_kind_of Enumerator::Chain, a.chain(b)
assert_kind_of Enumerator::Chain, a.chain(b, c)
assert_raise(NoMethodError) { c.chain }
end
assert("Enumerable#+") do
a = [].each
b = {}.reverse_each
c = Object.new # not has #each method
assert_kind_of Enumerator::Chain, a + b
assert_kind_of Enumerator::Chain, a + c
assert_kind_of Enumerator::Chain, b + a
assert_kind_of Enumerator::Chain, b + c
assert_raise(NoMethodError) { c + a }
end
assert("Enumerator.new") do
a = []
b = {}
c = Object.new # not has #each method
assert_kind_of Enumerator::Chain, Enumerator::Chain.new
assert_kind_of Enumerator::Chain, Enumerator::Chain.new(a, a)
assert_kind_of Enumerator::Chain, Enumerator::Chain.new(a, b)
assert_kind_of Enumerator::Chain, Enumerator::Chain.new(a, c)
assert_kind_of Enumerator::Chain, Enumerator::Chain.new(b, a)
assert_kind_of Enumerator::Chain, Enumerator::Chain.new(b, b)
assert_kind_of Enumerator::Chain, Enumerator::Chain.new(b, c)
assert_kind_of Enumerator::Chain, Enumerator::Chain.new(c, a)
end
assert("Enumerator::Chain#each") do
a = [1, 2, 3]
aa = a.chain(a)
assert_kind_of Enumerator, aa.each
assert_equal [1, 2, 3, 1, 2, 3], aa.each.to_a
aa = a.chain(a.reverse_each)
assert_kind_of Enumerator, aa.each
assert_equal [1, 2, 3, 3, 2, 1], aa.each.to_a
aa = a.chain(a.reverse_each, a)
assert_kind_of Enumerator, aa.each
assert_equal [1, 2, 3, 3, 2, 1, 1, 2, 3], aa.each.to_a
aa = a.chain(Object.new)
assert_kind_of Enumerator, aa.each
assert_raise(NoMethodError) { aa.each.to_a }
end
assert("Enumerator::Chain#size") do
a = [1, 2, 3]
aa = a.chain(a)
assert_equal 6, aa.size
aa = a.chain(a.reverse_each)
assert_nil aa.size
aa = a.chain(a.reverse_each, a)
assert_nil aa.size
aa = a.chain(Object.new)
assert_nil aa.size
end
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