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[tests] increase awhitening coverage

--- a/tests/src/spectral/test-awhitening.c

+++ b/tests/src/spectral/test-awhitening.c

@@ -1,6 +1,8 @@

 #include <aubio.h>

 #include "utils_tests.h"

+int test_wrong_params(void);

+

 int main (int argc, char **argv)

 {

   sint_t err = 0;

@@ -7,7 +9,13 @@

   if (argc < 3) {

     err = 2;

-    PRINT_ERR("not enough arguments\n");

+    PRINT_WRN("no arguments, running tests\n");

+    if (test_wrong_params() != 0) {

+      PRINT_ERR("tests failed!\n");

+      err = 1;

+    } else {

+      err = 0;

+    }

     PRINT_MSG("usage: %s <input_path> <output_path> [samplerate] [hop_size]\n", argv[0]);

     return err;

   }

@@ -82,3 +90,23 @@

   return err;

 }

+int test_wrong_params(void)

+{

+  uint_t buf_size = 512;

+  uint_t hop_size = 256;

+  uint_t samplerate = 44100;

+  aubio_spectral_whitening_t *o;

+

+  if (new_aubio_spectral_whitening(       0, hop_size, samplerate)) return 1;

+  if (new_aubio_spectral_whitening(buf_size,        0, samplerate)) return 1;

+  if (new_aubio_spectral_whitening(buf_size, hop_size,          0)) return 1;

+

+  o = new_aubio_spectral_whitening(buf_size, hop_size, samplerate);

+

+  aubio_spectral_whitening_get_relax_time(o);

+  aubio_spectral_whitening_get_floor(o);

+

+  del_aubio_spectral_whitening(o);

+

+  return 0;

+}