diff options
Diffstat (limited to 'spec/ruby/core/enumerator/lazy/drop_spec.rb')
-rw-r--r-- | spec/ruby/core/enumerator/lazy/drop_spec.rb | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/spec/ruby/core/enumerator/lazy/drop_spec.rb b/spec/ruby/core/enumerator/lazy/drop_spec.rb new file mode 100644 index 0000000000..eb65bb246b --- /dev/null +++ b/spec/ruby/core/enumerator/lazy/drop_spec.rb @@ -0,0 +1,52 @@ +# -*- encoding: us-ascii -*- + +require File.expand_path('../../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +describe "Enumerator::Lazy#drop" 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.drop(1) + ret.should be_an_instance_of(Enumerator::Lazy) + ret.should_not equal(@yieldsmixed) + end + + it "sets difference of given count with old size to new size" do + Enumerator::Lazy.new(Object.new, 100) {}.drop(20).size.should == 80 + Enumerator::Lazy.new(Object.new, 100) {}.drop(200).size.should == 0 + end + + describe "when the returned lazy enumerator is evaluated by Enumerable#first" do + it "stops after specified times" do + (0..Float::INFINITY).lazy.drop(2).first(2).should == [2, 3] + + @eventsmixed.drop(0).first(1) + ScratchPad.recorded.should == [:before_yield] + end + end + + describe "on a nested Lazy" do + it "sets difference of given count with old size to new size" do + Enumerator::Lazy.new(Object.new, 100) {}.drop(20).drop(50).size.should == 30 + Enumerator::Lazy.new(Object.new, 100) {}.drop(50).drop(20).size.should == 30 + end + + describe "when the returned lazy enumerator is evaluated by Enumerable#first" do + it "stops after specified times" do + (0..Float::INFINITY).lazy.drop(2).drop(2).first(2).should == [4, 5] + + @eventsmixed.drop(0).drop(0).first(1) + ScratchPad.recorded.should == [:before_yield] + end + end + end +end |