1 files changed, 8 insertions, 0 deletions
diff --git a/test/psych/test_symbol.rb b/test/psych/test_symbol.rb
index 2b4470d184..558a672886 100644
--- a/test/psych/test_symbol.rb
+++ b/test/psych/test_symbol.rb
@@ -2,6 +2,14 @@ require_relative 'helper'
 
 module Psych
   class TestSymbol < TestCase
+    def test_cycle_empty
+      assert_cycle :''
+    end
+
+    def test_cycle_colon
+      assert_cycle :':'
+    end
+
     def test_cycle
       assert_cycle :a
     end