diff options
Diffstat (limited to 'spec/ruby/core/enumerator/lazy/chunk_spec.rb')
-rw-r--r-- | spec/ruby/core/enumerator/lazy/chunk_spec.rb | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/spec/ruby/core/enumerator/lazy/chunk_spec.rb b/spec/ruby/core/enumerator/lazy/chunk_spec.rb new file mode 100644 index 0000000000..3e9d9e9dfd --- /dev/null +++ b/spec/ruby/core/enumerator/lazy/chunk_spec.rb @@ -0,0 +1,71 @@ +# -*- encoding: us-ascii -*- + +require File.expand_path('../../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +describe "Enumerator::Lazy#chunk" 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.chunk {} + ret.should be_an_instance_of(Enumerator::Lazy) + ret.should_not equal(@yieldsmixed) + end + + it "sets #size to nil" do + Enumerator::Lazy.new(Object.new, 100) {}.chunk { |v| v }.size.should == nil + end + + ruby_version_is ""..."2.4" do + it "raises an ArgumentError if called without a block" do + lambda do + @yieldsmixed.chunk + end.should raise_error(ArgumentError) + end + end + + ruby_version_is "2.4" do + it "returns an Enumerator if called without a block" do + chunk = @yieldsmixed.chunk + chunk.should be_an_instance_of(Enumerator::Lazy) + + res = chunk.each { |v| true }.force + res.should == [[true, EnumeratorLazySpecs::YieldsMixed.gathered_yields]] + end + end + + describe "when the returned lazy enumerator is evaluated by Enumerable#first" do + it "stops after specified times" do + first_two = (0..Float::INFINITY).lazy.chunk { |n| n.even? }.first(2) + first_two.should == [[true, [0]], [false, [1]]] + end + end + + it "calls the block with gathered values when yield with multiple arguments" do + yields = [] + @yieldsmixed.chunk { |v| yields << v; true }.force + yields.should == EnumeratorLazySpecs::YieldsMixed.gathered_yields + end + + describe "on a nested Lazy" do + it "sets #size to nil" do + Enumerator::Lazy.new(Object.new, 100) {}.take(20).chunk { |v| v }.size.should == nil + end + + describe "when the returned lazy enumerator is evaluated by Enumerable#first" do + it "stops after specified times" do + remains_lazy = (0..Float::INFINITY).lazy.chunk { |n| n } + remains_lazy.chunk { |n| n }.first(2).size.should == 2 + end + end + end +end |