make sure utf-8 cleaning doesn't grow without bounds

we had a bug where we'd inject utf-8 characters that we'd mangle and
then replace with even more utf-8 characters so that any normal attrs
would grow without bounds with lots of utf-8 '?' characters.

1 files changed, 7 insertions, 0 deletions

diff --git a/spec/ffi_yajl/encoder_spec.rb b/spec/ffi_yajl/encoder_spec.rb
index e7f17ce..13d3511 100644
--- a/spec/ffi_yajl/encoder_spec.rb
+++ b/spec/ffi_yajl/encoder_spec.rb
@@ -209,6 +209,13 @@ describe "FFI_Yajl::Encoder" do
         json = encoder.encode(ruby)
         expect(json).to match(/Hañs Helmüt/)
       end
+
+      it "does not grow after a round trip" do
+        json = encoder.encode(ruby)
+        ruby2 = FFI_Yajl::Parser.parse(json)
+        json2 = encoder.encode(ruby2)
+        expect(json).to eql(json2)
+      end
     end
   end
 end