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[tests] use fabs in test-timestretch to avoid double truncation

--- a/tests/src/effects/test-timestretch.c

+++ b/tests/src/effects/test-timestretch.c

@@ -1,6 +1,5 @@

 #define AUBIO_UNSTABLE 1

 #include <aubio.h>

-#include "aubio_priv.h"

 #include "utils_tests.h"

 int test_wrong_params(void);

@@ -128,7 +127,7 @@

   if (aubio_timestretch_get_transpose(p) != 0) return 1;

   if (aubio_timestretch_set_transpose(p, 2.)) return 1;

-  if (ABS(aubio_timestretch_get_transpose(p) - 2.) > 1.e-6) return 1;

+  if (fabs(aubio_timestretch_get_transpose(p) - 2.) >= 1e-6) return 1;

   if (!aubio_timestretch_set_transpose(p, 200.)) return 1;

   if (!aubio_timestretch_set_transpose(p, -200.)) return 1;

   if (aubio_timestretch_set_transpose(p, 0.)) return 1;

@@ -135,13 +134,13 @@

   if (aubio_timestretch_get_pitchscale(p) != 1) return 1;

   if (aubio_timestretch_set_pitchscale(p, 2.)) return 1;

-  if (ABS(aubio_timestretch_get_pitchscale(p) - 2.) > 1.e-6) return 1;

+  if (fabs(aubio_timestretch_get_pitchscale(p) - 2.) >= 1e-6) return 1;

   if (!aubio_timestretch_set_pitchscale(p, 0.)) return 1;

   if (!aubio_timestretch_set_pitchscale(p, 6.)) return 1;

   if (aubio_timestretch_get_stretch(p) != stretch) return 1;

   if (aubio_timestretch_set_stretch(p, 2.)) return 1;

-  if (ABS(aubio_timestretch_get_stretch(p) - 2.) > 1.e-6) return 1;

+  if (fabs(aubio_timestretch_get_stretch(p) - 2.) >= 1e-6) return 1;

   if (!aubio_timestretch_set_stretch(p, 0.)) return 1;

   if (!aubio_timestretch_set_stretch(p, 41.)) return 1;