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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
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