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tests/src/tempo/test-beattracking.c: print bpm

--- a/tests/src/tempo/test-beattracking.c

+++ b/tests/src/tempo/test-beattracking.c

@@ -1,6 +1,7 @@

 #define AUBIO_UNSTABLE 1

 #include <aubio.h>

+#include <stdio.h>

 int main ()

 {

@@ -24,6 +25,7 @@

     // get bpm and confidence

     bpm = aubio_beattracking_get_bpm(tempo);

+    fprintf(stderr, "found bpm %f\n", bpm);

     confidence = aubio_beattracking_get_confidence(tempo);

     i++;

   };