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require_relative '../../../spec_helper'
ruby_version_is "3.2" do
describe "Enumerator::Product#rewind" do
before :each do
@enum = Enumerator::Product.new([1, 2].each.to_enum, [:a, :b].each.to_enum)
end
it "resets the enumerator to its initial state" do
@enum.each.to_a.should == [[1, :a], [1, :b], [2, :a], [2, :b]]
@enum.rewind
@enum.each.to_a.should == [[1, :a], [1, :b], [2, :a], [2, :b]]
end
it "returns self" do
@enum.rewind.should.equal? @enum
end
it "has no effect on a new enumerator" do
@enum.rewind
@enum.each.to_a.should == [[1, :a], [1, :b], [2, :a], [2, :b]]
end
it "has no effect if called multiple, consecutive times" do
@enum.each.to_a.should == [[1, :a], [1, :b], [2, :a], [2, :b]]
@enum.rewind
@enum.rewind
@enum.each.to_a.should == [[1, :a], [1, :b], [2, :a], [2, :b]]
end
it "calls the enclosed object's rewind method if one exists" do
obj = mock('rewinder')
enum = Enumerator::Product.new(obj.to_enum)
obj.should_receive(:rewind)
enum.rewind
end
it "does nothing if the object doesn't have a #rewind method" do
obj = mock('rewinder')
enum = Enumerator::Product.new(obj.to_enum)
enum.rewind.should == enum
end
it "calls a rewind method on each enumerable in direct order" do
ScratchPad.record []
object1 = Object.new
def object1.rewind; ScratchPad << :object1; end
object2 = Object.new
def object2.rewind; ScratchPad << :object2; end
object3 = Object.new
def object3.rewind; ScratchPad << :object3; end
enum = Enumerator::Product.new(object1, object2, object3)
enum.rewind
ScratchPad.recorded.should == [:object1, :object2, :object3]
end
end
end
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