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require_relative '../../../spec_helper'
describe "Enumerator::Chain#rewind" do
before(:each) do
@obj = mock('obj')
@obj.should_receive(:each).any_number_of_times.and_yield
@second = mock('obj')
@second.should_receive(:each).any_number_of_times.and_yield
@enum = Enumerator::Chain.new(@obj, @second)
end
it "returns self" do
@enum.rewind.should equal @enum
end
it "does nothing if receiver has not been iterated" do
@obj.should_not_receive(:rewind)
@obj.respond_to?(:rewind).should == true # sanity check
@enum.rewind
end
it "does nothing on objects that don't respond_to rewind" do
@obj.respond_to?(:rewind).should == false # sanity check
@enum.each {}
@enum.rewind
end
it "calls_rewind its objects" do
@obj.should_receive(:rewind)
@enum.each {}
@enum.rewind
end
it "calls_rewind in reverse order" do
@obj.should_not_receive(:rewind)
@second.should_receive(:rewind).and_raise(RuntimeError)
@enum.each {}
-> { @enum.rewind }.should raise_error(RuntimeError)
end
it "calls rewind only for objects that have actually been iterated on" do
@obj = mock('obj')
@obj.should_receive(:each).any_number_of_times.and_raise(RuntimeError)
@enum = Enumerator::Chain.new(@obj, @second)
@obj.should_receive(:rewind)
@second.should_not_receive(:rewind)
-> { @enum.each {} }.should raise_error(RuntimeError)
@enum.rewind
end
end
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