diff options
Diffstat (limited to 'spec/ruby/core/enumerator/peek_spec.rb')
-rw-r--r-- | spec/ruby/core/enumerator/peek_spec.rb | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/spec/ruby/core/enumerator/peek_spec.rb b/spec/ruby/core/enumerator/peek_spec.rb new file mode 100644 index 0000000000..26ac85161b --- /dev/null +++ b/spec/ruby/core/enumerator/peek_spec.rb @@ -0,0 +1,36 @@ +require File.expand_path('../../../spec_helper', __FILE__) + +describe "Enumerator#peek" do + before :each do + @e = (1..5).to_a.to_enum + end + + it "returns the next element in self" do + @e.peek.should == 1 + end + + it "does not advance the position of the current element" do + @e.next.should == 1 + @e.peek.should == 2 + @e.next.should == 2 + end + + it "can be called repeatedly without advancing the position of the current element" do + @e.peek + @e.peek + @e.peek.should == 1 + @e.next.should == 1 + end + + it "works in concert with #rewind" do + @e.next + @e.next + @e.rewind + @e.peek.should == 1 + end + + it "raises StopIteration if called on a finished enumerator" do + 5.times { @e.next } + lambda { @e.peek }.should raise_error(StopIteration) + end +end |