1 files changed, 19 insertions, 0 deletions
diff --git a/spec/ruby/library/stringio/codepoints_spec.rb b/spec/ruby/library/stringio/codepoints_spec.rb
new file mode 100644
index 0000000000..ceaadefc32
--- /dev/null
+++ b/spec/ruby/library/stringio/codepoints_spec.rb
@@ -0,0 +1,19 @@
+# -*- encoding: utf-8 -*-
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/codepoints'
+
+ruby_version_is ''...'3.0' do
+  # See redmine #1667
+  describe "StringIO#codepoints" do
+    before :each do
+      @verbose, $VERBOSE = $VERBOSE, nil
+    end
+
+    after :each do
+      $VERBOSE = @verbose
+    end
+
+    it_behaves_like :stringio_codepoints, :codepoints
+  end
+end