1 files changed, 8 insertions, 0 deletions
diff --git a/test/ruby/test_pack.rb b/test/ruby/test_pack.rb
index 59edc3eb4b..5d2b656058 100644
--- a/test/ruby/test_pack.rb
+++ b/test/ruby/test_pack.rb
@@ -718,5 +718,13 @@ EXPECTED
     assert_warning(/unknown pack directive ',' in ','/) {
       [].pack(",")
     }
+    assert_warning(/\A[ -~]+\Z/) {
+      [].pack("\x7f")
+    }
+    assert_warning(/\A(.* in '\u{3042}'\n)+\z/) {
+      EnvUtil.with_default_external(Encoding::UTF_8) {
+        [].pack("\u{3042}")
+      }
+    }
   end
 end