diff options
Diffstat (limited to 'spec/ruby/core/enumerator/peek_values_spec.rb')
-rw-r--r-- | spec/ruby/core/enumerator/peek_values_spec.rb | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/spec/ruby/core/enumerator/peek_values_spec.rb b/spec/ruby/core/enumerator/peek_values_spec.rb new file mode 100644 index 0000000000..ecc4758854 --- /dev/null +++ b/spec/ruby/core/enumerator/peek_values_spec.rb @@ -0,0 +1,57 @@ +require File.expand_path('../../../spec_helper', __FILE__) + +describe "Enumerator#peek_values" do + before :each do + o = Object.new + def o.each + yield :a + yield :b1, :b2 + yield :c + yield :d1, :d2 + yield :e1, :e2, :e3 + yield nil + yield + end + + @e = o.to_enum + end + + it "returns the next element in self" do + @e.peek_values.should == [:a] + end + + it "does not advance the position of the current element" do + @e.next.should == :a + @e.peek_values.should == [:b1, :b2] + @e.next.should == [:b1, :b2] + end + + it "can be called repeatedly without advancing the position of the current element" do + @e.peek_values + @e.peek_values + @e.peek_values.should == [:a] + @e.next.should == :a + end + + it "works in concert with #rewind" do + @e.next + @e.next + @e.rewind + @e.peek_values.should == [:a] + end + + it "returns an array with only nil if yield is called with nil" do + 5.times { @e.next } + @e.peek_values.should == [nil] + end + + it "returns an empty array if yield is called without arguments" do + 6.times { @e.next } + @e.peek_values.should == [] + end + + it "raises StopIteration if called on a finished enumerator" do + 7.times { @e.next } + lambda { @e.peek_values }.should raise_error(StopIteration) + end +end |