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require_relative '../../spec_helper'
require_relative 'fixtures/common'
describe "Enumerator#rewind" do
before :each do
@enum = 1.upto(3)
end
it "resets the enumerator to its initial state" do
@enum.next.should == 1
@enum.next.should == 2
@enum.rewind
@enum.next.should == 1
end
it "returns self" do
@enum.rewind.should == @enum
end
it "has no effect on a new enumerator" do
@enum.rewind
@enum.next.should == 1
end
it "has no effect if called multiple, consecutive times" do
@enum.next.should == 1
@enum.rewind
@enum.rewind
@enum.next.should == 1
end
it "works with peek to reset the position" do
@enum.next
@enum.next
@enum.rewind
@enum.next
@enum.peek.should == 2
end
it "calls the enclosed object's rewind method if one exists" do
obj = mock('rewinder')
enum = obj.to_enum
obj.should_receive(:each).at_most(1)
obj.should_receive(:rewind)
enum.rewind
end
it "does nothing if the object doesn't have a #rewind method" do
obj = mock('rewinder')
enum = obj.to_enum
obj.should_receive(:each).at_most(1)
-> { enum.rewind.should == enum }.should_not raise_error
end
end
describe "Enumerator#rewind" do
before :each do
ScratchPad.record []
@enum = EnumeratorSpecs::Feed.new.to_enum(:each)
end
it "clears a pending #feed value" do
@enum.next
@enum.feed :a
@enum.rewind
@enum.next
@enum.next
ScratchPad.recorded.should == [nil]
end
end
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