diff options
Diffstat (limited to 'spec/ruby/core/enumerator/lazy/take_while_spec.rb')
-rw-r--r-- | spec/ruby/core/enumerator/lazy/take_while_spec.rb | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/spec/ruby/core/enumerator/lazy/take_while_spec.rb b/spec/ruby/core/enumerator/lazy/take_while_spec.rb new file mode 100644 index 0000000000..8647dfcaf0 --- /dev/null +++ b/spec/ruby/core/enumerator/lazy/take_while_spec.rb @@ -0,0 +1,60 @@ +# -*- encoding: us-ascii -*- + +require File.expand_path('../../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +describe "Enumerator::Lazy#take_while" 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.take_while {} + 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) {}.take_while { true }.size.should == nil + end + + describe "when the returned lazy enumerator is evaluated by .force" do + it "stops after specified times" do + (0..Float::INFINITY).lazy.take_while { |n| n < 3 }.force.should == [0, 1, 2] + + @eventsmixed.take_while { false }.force + ScratchPad.recorded.should == [:before_yield] + end + end + + it "calls the block with initial values when yield with multiple arguments" do + yields = [] + @yieldsmixed.take_while { |v| yields << v; true }.force + yields.should == EnumeratorLazySpecs::YieldsMixed.initial_yields + end + + it "raises an ArgumentError when not given a block" do + lambda { @yieldsmixed.take_while }.should raise_error(ArgumentError) + end + + describe "on a nested Lazy" do + it "sets #size to nil" do + Enumerator::Lazy.new(Object.new, 100) {}.take(20).take_while { true }.size.should == nil + end + + describe "when the returned lazy enumerator is evaluated by .force" do + it "stops after specified times" do + (0..Float::INFINITY).lazy.take_while { |n| n < 3 }.take_while(&:even?).force.should == [0] + + @eventsmixed.take_while { true }.take_while { false }.force + ScratchPad.recorded.should == [:before_yield] + end + end + end +end |