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require './test/test_helper'
require 'backports/3.2.0/enumerator/product'
class ProductTest < Test::Unit::TestCase
def test_product
##
## Enumerator::Product
##
# 0-dimensional
e = Enumerator::Product.new
assert_instance_of(Enumerator::Product, e)
assert_kind_of(Enumerator, e)
assert_equal(1, e.size)
elts = []
e.each { |x| elts << x }
assert_equal [[]], elts
assert_equal elts, e.to_a
heads = []
e.each { |x,| heads << x }
assert_equal [nil], heads
# 1-dimensional
e = Enumerator::Product.new(1..3)
assert_instance_of(Enumerator::Product, e)
assert_kind_of(Enumerator, e)
assert_equal(3, e.size)
elts = []
e.each { |x| elts << x }
assert_equal [[1], [2], [3]], elts
assert_equal elts, e.to_a
# 2-dimensional
e = Enumerator::Product.new(1..3, %w[a b])
assert_instance_of(Enumerator::Product, e)
assert_kind_of(Enumerator, e)
assert_equal(3 * 2, e.size)
elts = []
e.each { |x| elts << x }
assert_equal [[1, "a"], [1, "b"], [2, "a"], [2, "b"], [3, "a"], [3, "b"]], elts
assert_equal elts, e.to_a
heads = []
e.each { |x,| heads << x }
assert_equal [1, 1, 2, 2, 3, 3], heads
# Reject keyword arguments
assert_raise(ArgumentError) {
Enumerator::Product.new(1..3, foo: 1, bar: 2)
} unless RUBY_VERSION < '2.7'
##
## Enumerator.product
##
# without a block
e = Enumerator.product(1..3, %w[a b])
assert_instance_of(Enumerator::Product, e)
# with a block
elts = []
ret = Enumerator.product(1..3) { |x| elts << x }
assert_equal(nil, ret)
assert_equal [[1], [2], [3]], elts
assert_equal elts, Enumerator.product(1..3).to_a
# an infinite enumerator and a finite enumerable
e = Enumerator.product(1..Float::INFINITY, 'a'..'c')
assert_equal(Float::INFINITY, e.size)
assert_equal [[1, "a"], [1, "b"], [1, "c"], [2, "a"]], e.take(4)
# an infinite enumerator and an unknown enumerator
e = Enumerator.product(1..Float::INFINITY, Enumerator.new { |y| y << 'a' << 'b' })
assert_equal(Float::INFINITY, e.size)
assert_equal [[1, "a"], [1, "b"], [2, "a"], [2, "b"]], e.take(4)
# an infinite enumerator and an unknown enumerator
e = Enumerator.product(1..3, Enumerator.new { |y| y << 'a' << 'b' })
assert_equal(nil, e.size)
assert_equal [[1, "a"], [1, "b"], [2, "a"], [2, "b"]], e.take(4)
# Reject keyword arguments
assert_raise(ArgumentError) {
Enumerator.product(1..3, foo: 1, bar: 2)
} unless RUBY_VERSION < '2.7'
end
end
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