Fix tests

--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -1,6 +1,6 @@
 ## Process this file with automake to produce Makefile.in
 
-noinst_PROGRAMS = make_sine sfprocess list_formats generate sndfilehandle \
+check_PROGRAMS = make_sine sfprocess list_formats generate sndfilehandle \
 	sndfile-to-text sndfile-loopify
 
 AM_CPPFLAGS = -I$(top_srcdir)/src