1 files changed, 64 insertions, 0 deletions
diff --git a/spec/ruby/core/enumerator/product/rewind_spec.rb b/spec/ruby/core/enumerator/product/rewind_spec.rb
new file mode 100644
index 0000000000..e8ee730239
--- /dev/null
+++ b/spec/ruby/core/enumerator/product/rewind_spec.rb
@@ -0,0 +1,64 @@
+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