1 files changed, 27 insertions, 0 deletions
diff --git a/spec/ruby/core/refinement/prepend_spec.rb b/spec/ruby/core/refinement/prepend_spec.rb
new file mode 100644
index 0000000000..27b70d392a
--- /dev/null
+++ b/spec/ruby/core/refinement/prepend_spec.rb
@@ -0,0 +1,27 @@
+require_relative '../../spec_helper'
+
+describe "Refinement#prepend" do
+  ruby_version_is "3.1"..."3.2" do
+    it "warns about deprecation" do
+      Module.new do
+        refine String do
+          -> {
+            prepend Module.new
+          }.should complain(/warning: Refinement#prepend is deprecated and will be removed in Ruby 3.2/)
+        end
+      end
+    end
+  end
+
+  ruby_version_is "3.2" do
+    it "raises a TypeError" do
+      Module.new do
+        refine String do
+          -> {
+            prepend Module.new
+          }.should raise_error(TypeError, "Refinement#prepend has been removed")
+        end
+      end
+    end
+  end
+end