diff --git a/core/range/cover_spec.rb b/core/range/cover_spec.rb
index 29c0e0bfa8..fa881607e9 100644
--- a/core/range/cover_spec.rb
+++ b/core/range/cover_spec.rb
@@ -6,4 +6,5 @@
 describe "Range#cover?" do
   it_behaves_like :range_cover_and_include, :cover?
   it_behaves_like :range_cover, :cover?
+  it_behaves_like :range_cover_subrange, :cover?
 end
diff --git a/core/range/shared/cover.rb b/core/range/shared/cover.rb
index 33d416fef5..5b09cea4e0 100644
--- a/core/range/shared/cover.rb
+++ b/core/range/shared/cover.rb
@@ -90,7 +90,9 @@
       end
     end
   end
+end
 
+describe :range_cover_subrange, shared: true do
   ruby_version_is "2.6" do
     context "range argument" do
       it "accepts range argument" do