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Diffstat (limited to 'spec/ruby/core/array/product_spec.rb')
-rw-r--r-- | spec/ruby/core/array/product_spec.rb | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/spec/ruby/core/array/product_spec.rb b/spec/ruby/core/array/product_spec.rb new file mode 100644 index 0000000000..1ab38e34be --- /dev/null +++ b/spec/ruby/core/array/product_spec.rb @@ -0,0 +1,68 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +describe "Array#product" do + it "returns converted arguments using :to_ary" do + lambda{ [1].product(2..3) }.should raise_error(TypeError) + ar = ArraySpecs::ArrayConvertable.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 |