[tests] use double quotes for \0

diff --git a/tests/src/io/base-source_custom.h b/tests/src/io/base-source_custom.h
index 3991160..cff2d3e 100644 (file)
--- a/tests/src/io/base-source_custom.h
+++ b/tests/src/io/base-source_custom.h
@@ -74,7 +74,7 @@ int test_wrong_params(void)
   aubio_source_custom_t *s;
 
   if (new_aubio_source_custom(0,    samplerate, hop_size)) return 1;
   aubio_source_custom_t *s;
 
   if (new_aubio_source_custom(0,    samplerate, hop_size)) return 1;

-  if (new_aubio_source_custom('\0', samplerate, hop_size)) return 1;
+  if (new_aubio_source_custom("\0", samplerate, hop_size)) return 1;

   if (new_aubio_source_custom(uri,          -1, hop_size)) return 1;
   if (new_aubio_source_custom(uri,           0,        0)) return 1;
 
   if (new_aubio_source_custom(uri,          -1, hop_size)) return 1;
   if (new_aubio_source_custom(uri,           0,        0)) return 1;