1 files changed, 9 insertions, 0 deletions
diff --git a/activesupport/test/safe_buffer_test.rb b/activesupport/test/safe_buffer_test.rb
index efa9d5e61f..fca4b45276 100644
--- a/activesupport/test/safe_buffer_test.rb
+++ b/activesupport/test/safe_buffer_test.rb
@@ -165,4 +165,13 @@ class SafeBufferTest < ActiveSupport::TestCase
     x = 'foo %{x} bar'.html_safe % { x: 'qux' }
     assert x.html_safe?, 'should be safe'
   end
+
+  test 'Should not affect frozen objects when accessing characters' do
+    x = 'Hello'.html_safe
+    assert_nothing_raised do
+      x[/a/, 1]
+    end
+  end
+
+
 end