1 files changed, 5 insertions, 0 deletions
diff --git a/test/ruby/test_m17n.rb b/test/ruby/test_m17n.rb
index 8e7e4c6f91..950d205ae5 100644
--- a/test/ruby/test_m17n.rb
+++ b/test/ruby/test_m17n.rb
@@ -1678,4 +1678,9 @@ class TestM17N < Test::Unit::TestCase
     end
     assert_equal(e("[\"\xB4\xC1\xBB\xFA\"]"), s, bug11787)
   end
+
+  def test_greek_capital_gap
+    bug12204 = '[ruby-core:74478] [Bug #12204] GREEK CAPITAL RHO and SIGMA'
+    assert_equal("\u03A3", "\u03A1".succ, bug12204)
+  end
 end