tests: adapt libfixmath tests for change

tests/libfixmath/Makefile

@@ -2,5 +2,6 @@ APPLICATION = libfixmath
 include ../Makefile.tests_common
 
 USEPKG += libfixmath
+USEMODULE += libfixmath
 
 include $(RIOTBASE)/Makefile.include

tests/libfixmath_unittests/Makefile

@@ -8,6 +8,8 @@ BOARD_BLACKLIST := arduino-mega2560
 # The MSP boards don't feature round(), exp(), and log(), which are used in the unittests
 BOARD_BLACKLIST += chronos msb-430 msb-430h telosb wsn430-v1_3b wsn430-v1_4 z1
 
+BOARD_INSUFFICIENT_MEMORY := weio
+
 USEMODULE += libfixmath-unittests
 
 ifneq (,$(filter native qemu-i386,$(BOARD)))

tests/libfixmath_unittests/main.c

@@ -29,10 +29,16 @@
  */
 
 #include <stdio.h>
+#include "libfixmath-unittests.h"
+
+#define RUN(x)  if (x() != 0) { return 1; }
 
 int main(void)
 {
-#include "fix16_unittests.inc"
+    RUN(fix16_exp_unittests);
+    RUN(fix16_macros_unittests);
+    RUN(fix16_str_unittests);
+    RUN(fix16_unittests);
 
     puts("All tests executed.");
     return 0;