1 files changed, 56 insertions, 0 deletions
diff --git a/spec/ruby/core/enumerator/product/size_spec.rb b/spec/ruby/core/enumerator/product/size_spec.rb
new file mode 100644
index 0000000000..46958b1a22
--- /dev/null
+++ b/spec/ruby/core/enumerator/product/size_spec.rb
@@ -0,0 +1,56 @@
+require_relative '../../../spec_helper'
+
+ruby_version_is "3.2" do
+  describe "Enumerator::Product#size" do
+    it "returns the total size of the enumerator product calculated by multiplying the sizes of enumerables in the product" do
+      product = Enumerator::Product.new(1..2, 1..3, 1..4)
+      product.size.should == 24 # 2 * 3 * 4
+    end
+
+    it "returns nil if any enumerable reports its size as nil" do
+      enum = Object.new
+      def enum.size; nil; end
+
+      product = Enumerator::Product.new(1..2, enum)
+      product.size.should == nil
+    end
+
+    it "returns Float::INFINITY if any enumerable reports its size as Float::INFINITY" do
+      enum = Object.new
+      def enum.size; Float::INFINITY; end
+
+      product = Enumerator::Product.new(1..2, enum)
+      product.size.should == Float::INFINITY
+    end
+
+    it "returns nil if any enumerable reports its size as Float::NAN" do
+      enum = Object.new
+      def enum.size; Float::NAN; end
+
+      product = Enumerator::Product.new(1..2, enum)
+      product.size.should == nil
+    end
+
+    it "returns nil if any enumerable doesn't respond to #size" do
+      enum = Object.new
+      product = Enumerator::Product.new(1..2, enum)
+      product.size.should == nil
+    end
+
+    it "returns nil if any enumerable reports a not-convertible to Integer" do
+      enum = Object.new
+      def enum.size; :symbol; end
+
+      product = Enumerator::Product.new(1..2, enum)
+      product.size.should == nil
+    end
+
+    it "returns nil if any enumerable reports a non-Integer but convertible to Integer size" do
+      enum = Object.new
+      def enum.size; 1.0; end
+
+      product = Enumerator::Product.new(1..2, enum)
+      product.size.should == nil
+    end
+  end
+end