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[tests] create a temporary sink, use in wavetable test

When called without argument, test-wavetable will invoke the function
run_on_default_sink to create a temporary file and runs the main
function on it.

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

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

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

   sint_t err = 0;

   if (argc < 2) {

-    err = 2;

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

+    PRINT_ERR("not enough arguments, running tests\n");

+    err = run_on_default_sink(main);

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

     return err;

   }

--- a/tests/utils_tests.h

+++ b/tests/utils_tests.h

@@ -5,6 +5,13 @@

 #include <assert.h>

 #include "config.h"

+#ifdef HAVE_LIMITS_H

+#include <limits.h> // PATH_MAX

+#endif /* HAVE_LIMITS_H */

+#ifndef PATH_MAX

+#define PATH_MAX 1024

+#endif

+

 #ifdef HAVE_C99_VARARGS_MACROS

 #define PRINT_ERR(...)   fprintf(stderr, "AUBIO-TESTS ERROR: " __VA_ARGS__)

 #define PRINT_MSG(...)   fprintf(stdout, __VA_ARGS__)

@@ -50,4 +57,19 @@

   int seed = tm_struct->tm_sec;

   //PRINT_WRN("current seed: %d\n", seed);

   srandom (seed);

+}

+

+int run_on_default_sink( int main(int, char**) )

+{

+  int argc = 2, err;

+  char* argv[argc];

+  char sink_path[PATH_MAX] = "tmp_aubio_XXXXXX";

+  int fd = mkstemp(sink_path);

+  argv[0] = __FILE__;

+  if (!fd) return 1;

+  argv[1] = sink_path;

+  err = main(argc, argv);

+  unlink(sink_path);

+  close(fd);

+  return err;

 }