1 files changed, 30 insertions, 2 deletions
diff --git a/spec/ruby/core/module/include_spec.rb b/spec/ruby/core/module/include_spec.rb
index c47e052d22..78f6b41031 100644
--- a/spec/ruby/core/module/include_spec.rb
+++ b/spec/ruby/core/module/include_spec.rb
@@ -47,6 +47,34 @@ describe "Module#include" do
     -> { ModuleSpecs::SubclassSpec.include(ModuleSpecs::Subclass.new) }.should_not raise_error(TypeError)
   end
 
+  ruby_version_is ""..."3.2" do
+    it "raises ArgumentError when the argument is a refinement" do
+      refinement = nil
+
+      Module.new do
+        refine String do
+          refinement = self
+        end
+      end
+
+      -> { ModuleSpecs::Basic.include(refinement) }.should raise_error(ArgumentError, "refinement module is not allowed")
+    end
+  end
+
+  ruby_version_is "3.2" do
+    it "raises a TypeError when the argument is a refinement" do
+      refinement = nil
+
+      Module.new do
+        refine String do
+          refinement = self
+        end
+      end
+
+      -> { ModuleSpecs::Basic.include(refinement) }.should raise_error(TypeError, "Cannot include refinement")
+    end
+  end
+
   it "imports constants to modules and classes" do
     ModuleSpecs::A.constants.should include(:CONSTANT_A)
     ModuleSpecs::B.constants.should include(:CONSTANT_A, :CONSTANT_B)
@@ -104,9 +132,9 @@ describe "Module#include" do
       class A; include M; end
       class B < A; include M; end
 
-      all = [A,B,M]
+      all = [A, B, M]
 
-      (B.ancestors & all).should == [B, A, M]
+      (B.ancestors.filter { |a| all.include?(a) }).should == [B, A, M]
     end
   end