diff options
Diffstat (limited to 'spec/ruby/core/enumerator/lazy/zip_spec.rb')
-rw-r--r-- | spec/ruby/core/enumerator/lazy/zip_spec.rb | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/spec/ruby/core/enumerator/lazy/zip_spec.rb b/spec/ruby/core/enumerator/lazy/zip_spec.rb new file mode 100644 index 0000000000..9c728364ce --- /dev/null +++ b/spec/ruby/core/enumerator/lazy/zip_spec.rb @@ -0,0 +1,74 @@ +# -*- encoding: us-ascii -*- + +require File.expand_path('../../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +describe "Enumerator::Lazy#zip" do + before :each do + @yieldsmixed = EnumeratorLazySpecs::YieldsMixed.new.to_enum.lazy + @eventsmixed = EnumeratorLazySpecs::EventsMixed.new.to_enum.lazy + ScratchPad.record [] + end + + after :each do + ScratchPad.clear + end + + it "returns a new instance of Enumerator::Lazy" do + ret = @yieldsmixed.zip [] + ret.should be_an_instance_of(Enumerator::Lazy) + ret.should_not equal(@yieldsmixed) + end + + it "keeps size" do + Enumerator::Lazy.new(Object.new, 100) {}.zip([], []).size.should == 100 + end + + describe "when the returned lazy enumerator is evaluated by Enumerable#first" do + it "stops after specified times" do + (0..Float::INFINITY).lazy.zip([4, 5], [8]).first(2).should == [[0, 4, 8], [1, 5, nil]] + + @eventsmixed.zip([0, 1]).first(1) + ScratchPad.recorded.should == [:before_yield] + end + end + + it "calls the block with a gathered array when yield with multiple arguments" do + yields = @yieldsmixed.zip(EnumeratorLazySpecs::YieldsMixed.new.to_enum).force + yields.should == [EnumeratorLazySpecs::YieldsMixed.gathered_yields, + EnumeratorLazySpecs::YieldsMixed.gathered_yields].transpose + end + + it "returns a Lazy when no arguments given" do + @yieldsmixed.zip.should be_an_instance_of(Enumerator::Lazy) + end + + it "raises a TypeError if arguments contain non-list object" do + lambda { @yieldsmixed.zip [], Object.new, [] }.should raise_error(TypeError) + end + + describe "on a nested Lazy" do + it "keeps size" do + Enumerator::Lazy.new(Object.new, 100) {}.map {}.zip([], []).size.should == 100 + end + + it "behaves as Enumerable#zip when given a block" do + lazy_yields = [] + lazy_ret = @yieldsmixed.zip(EnumeratorLazySpecs::YieldsMixed.new.to_enum) { |lists| lazy_yields << lists } + enum_yields = [] + enum_ret = EnumeratorLazySpecs::YieldsMixed.new.to_enum.zip(EnumeratorLazySpecs::YieldsMixed.new.to_enum) { |lists| enum_yields << lists } + + lazy_yields.should == enum_yields + lazy_ret.should == enum_ret + end + + describe "when the returned lazy enumerator is evaluated by Enumerable#first" do + it "stops after specified times" do + (0..Float::INFINITY).lazy.map(&:succ).zip([4, 5], [8]).first(2).should == [[1, 4, 8], [2, 5, nil]] + + @eventsmixed.zip([0, 1]).zip([0, 1]).first(1) + ScratchPad.recorded.should == [:before_yield] + end + end + end +end |