1 files changed, 7 insertions, 0 deletions
diff --git a/spec/ruby/core/symbol/upcase_spec.rb b/spec/ruby/core/symbol/upcase_spec.rb
index fce62af100..fe2c88d294 100644
--- a/spec/ruby/core/symbol/upcase_spec.rb
+++ b/spec/ruby/core/symbol/upcase_spec.rb
@@ -16,6 +16,13 @@ describe "Symbol#upcase" do
     end
   end
 
+  ruby_version_is '2.4' do
+    it "capitalizes all Unicode characters" do
+      "äöü".to_sym.upcase.should == :"ÄÖÜ"
+      "aou".to_sym.upcase.should == :"AOU"
+    end
+  end
+
   it "leaves non-alphabetic ASCII characters as they were" do
     "Glark?!?".to_sym.upcase.should == :"GLARK?!?"
   end