tests: Ensure we don't disable asserts

Change-Id: Ieede7bc3c7b9d7dadc48a41b54dbe6c2b474c555
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/Makefile.am b/Makefile.am
index 384af50..abaa980 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -28,6 +28,11 @@
 check_PROGRAMS =
 XFAIL_TESTS =
 
+AM_LIBS = $(CODE_COVERAGE_LIBS)
+AM_CPPFLAGS = $(CODE_COVERAGE_CPPFLAGS) -UNDEBUG
+AM_CFLAGS = $(CODE_COVERAGE_CFLAGS)
+AM_CXXFLAGS = $(CODE_COVERAGE_CXXFLAGS)
+
 include test/Makefile.am.include
 include vpnor/test/Makefile.am.include