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require File.expand_path('../../../spec_helper', __FILE__)
ruby_version_is "1.9" do
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
end
|
