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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Array#product" do
it "returns converted arguments using :to_ary" do
lambda{ [1].product(2..3) }.should raise_error(TypeError)
ar = ArraySpecs::ArrayConvertible.new(2,3)
[1].product(ar).should == [[1,2],[1,3]]
ar.called.should == :to_ary
end
it "returns the expected result" do
[1,2].product([3,4,5],[6,8]).should == [[1, 3, 6], [1, 3, 8], [1, 4, 6], [1, 4, 8], [1, 5, 6], [1, 5, 8],
[2, 3, 6], [2, 3, 8], [2, 4, 6], [2, 4, 8], [2, 5, 6], [2, 5, 8]]
end
it "has no required argument" do
[1,2].product.should == [[1],[2]]
end
it "returns an empty array when the argument is an empty array" do
[1, 2].product([]).should == []
end
it "does not attempt to produce an unreasonable number of products" do
a = (0..100).to_a
lambda do
a.product(a, a, a, a, a, a, a, a, a, a)
end.should raise_error(RangeError)
end
describe "when given a block" do
it "yields all combinations in turn" do
acc = []
[1,2].product([3,4,5],[6,8]){|array| acc << array}
acc.should == [[1, 3, 6], [1, 3, 8], [1, 4, 6], [1, 4, 8], [1, 5, 6], [1, 5, 8],
[2, 3, 6], [2, 3, 8], [2, 4, 6], [2, 4, 8], [2, 5, 6], [2, 5, 8]]
acc = []
[1,2].product([3,4,5],[],[6,8]){|array| acc << array}
acc.should be_empty
end
it "returns self" do
a = [1, 2, 3].freeze
a.product([1, 2]) { |p| p.first }.should == a
end
it "will ignore unreasonable numbers of products and yield anyway" do
a = (0..100).to_a
lambda do
a.product(a, a, a, a, a, a, a, a, a, a)
end.should raise_error(RangeError)
end
end
describe "when given an empty block" do
it "returns self" do
arr = [1,2]
arr.product([3,4,5],[6,8]){}.should equal(arr)
arr = []
arr.product([3,4,5],[6,8]){}.should equal(arr)
arr = [1,2]
arr.product([]){}.should equal(arr)
end
end
end
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