1 files changed, 54 insertions, 0 deletions
diff --git a/spec/ruby/core/enumerator/product/initialize_copy_spec.rb b/spec/ruby/core/enumerator/product/initialize_copy_spec.rb
new file mode 100644
index 0000000000..46e8421322
--- /dev/null
+++ b/spec/ruby/core/enumerator/product/initialize_copy_spec.rb
@@ -0,0 +1,54 @@
+require_relative '../../../spec_helper'
+
+ruby_version_is "3.2" do
+  describe "Enumerator::Product#initialize_copy" do
+    it "replaces content of the receiver with content of the other object" do
+      enum = Enumerator::Product.new([true, false])
+      enum2 = Enumerator::Product.new([1, 2], [:a, :b])
+
+      enum.send(:initialize_copy, enum2)
+      enum.each.to_a.should == [[1, :a], [1, :b], [2, :a], [2, :b]]
+    end
+
+    it "returns self" do
+      enum = Enumerator::Product.new([true, false])
+      enum2 = Enumerator::Product.new([1, 2], [:a, :b])
+
+      enum.send(:initialize_copy, enum2).should.equal?(enum)
+    end
+
+    it "is a private method" do
+      Enumerator::Product.should have_private_instance_method(:initialize_copy, false)
+    end
+
+    it "does nothing if the argument is the same as the receiver" do
+      enum = Enumerator::Product.new(1..2)
+      enum.send(:initialize_copy, enum).should.equal?(enum)
+
+      enum.freeze
+      enum.send(:initialize_copy, enum).should.equal?(enum)
+    end
+
+    it "raises FrozenError if the receiver is frozen" do
+      enum = Enumerator::Product.new(1..2)
+      enum2 = Enumerator::Product.new(3..4)
+
+      -> { enum.freeze.send(:initialize_copy, enum2) }.should raise_error(FrozenError)
+    end
+
+    it "raises TypeError if the objects are of different class" do
+      enum = Enumerator::Product.new(1..2)
+      enum2 = Class.new(Enumerator::Product).new(3..4)
+
+      -> { enum.send(:initialize_copy, enum2) }.should raise_error(TypeError, 'initialize_copy should take same class object')
+      -> { enum2.send(:initialize_copy, enum) }.should raise_error(TypeError, 'initialize_copy should take same class object')
+    end
+
+    it "raises ArgumentError if the argument is not initialized yet" do
+      enum = Enumerator::Product.new(1..2)
+      enum2 = Enumerator::Product.allocate
+
+      -> { enum.send(:initialize_copy, enum2) }.should raise_error(ArgumentError, 'uninitialized product')
+    end
+  end
+end