1 files changed, 7 insertions, 0 deletions
diff --git a/test/ruby/test_transcode.rb b/test/ruby/test_transcode.rb
index 530e8f4669..e88979a681 100644
--- a/test/ruby/test_transcode.rb
+++ b/test/ruby/test_transcode.rb
@@ -2063,4 +2063,11 @@ class TestTranscode < Test::Unit::TestCase
     end
     assert_equal("U+3042", "\u{3042}".encode("US-ASCII", fallback: fallback.method(:escape)))
   end
+
+  bug8940 = '[ruby-core:57318] [Bug #8940]'
+  %w[UTF-32 UTF-16].each do |enc|
+    define_method("test_pseudo_encoding_inspect(#{enc})") do
+      assert_normal_exit("'aaa'.encode('#{enc}').inspect", bug8940)
+    end
+  end
 end