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[tests] fix argument parsing in onset and wavetable

--- a/tests/src/onset/test-onset.c

+++ b/tests/src/onset/test-onset.c

@@ -17,8 +17,8 @@

   uint_t win_s = 1024; // window size

   uint_t hop_size = win_s / 4;

   uint_t n_frames = 0, read = 0;

-  if ( argc == 3 ) samplerate = atoi(argv[2]);

-  if ( argc == 4 ) hop_size = atoi(argv[3]);

+  if ( argc >= 3 ) samplerate = atoi(argv[2]);

+  if ( argc >= 4 ) hop_size = atoi(argv[3]);

   char_t *source_path = argv[1];

   aubio_source_t * source = new_aubio_source(source_path, samplerate, hop_size);

--- a/tests/src/synth/test-wavetable.c

+++ b/tests/src/synth/test-wavetable.c

@@ -17,8 +17,8 @@

   smpl_t freq = 440.;

   char_t *sink_path = argv[1];

-  if ( argc == 4 ) samplerate = atoi(argv[3]);

-  if ( argc == 3 ) freq = atof(argv[2]);

+  if ( argc >= 4 ) samplerate = atoi(argv[3]);

+  if ( argc >= 3 ) freq = atof(argv[2]);

   fvec_t *vec = new_fvec(hop_size);

   aubio_sink_t *sink = new_aubio_sink(sink_path, samplerate);