1 files changed, 41 insertions, 1 deletions
diff --git a/spec/ruby/core/module/refine_spec.rb b/spec/ruby/core/module/refine_spec.rb
index b54d83075f..ca7db0c2b6 100644
--- a/spec/ruby/core/module/refine_spec.rb
+++ b/spec/ruby/core/module/refine_spec.rb
@@ -320,7 +320,7 @@ describe "Module#refine" do
     result.should == "foo from subclass"
   end
 
-  context "for methods accesses indirectly" do
+  context "for methods accessed indirectly" do
     ruby_version_is "" ... "2.4" do
       it "is not honored by Kernel#send" do
         refinement = Module.new do
@@ -425,6 +425,46 @@ describe "Module#refine" do
       end
     end
 
+    ruby_version_is "" ... "2.5" do
+      it "is not honored by string interpolation" do
+        refinement = Module.new do
+          refine Integer do
+            def to_s
+              "foo"
+            end
+          end
+        end
+
+        result = nil
+        Module.new do
+          using refinement
+          result = "#{1}"
+        end
+
+        result.should == "1"
+      end
+    end
+
+    ruby_version_is "2.5" do
+      it "is honored by string interpolation" do
+        refinement = Module.new do
+          refine Integer do
+            def to_s
+              "foo"
+            end
+          end
+        end
+
+        result = nil
+        Module.new do
+          using refinement
+          result = "#{1}"
+        end
+
+        result.should == "foo"
+      end
+    end
+
     it "is honored by Kernel#binding" do
       refinement = Module.new do
         refine String do