1 files changed, 13 insertions, 0 deletions
diff --git a/common.h b/common.h
index 6566fd0..2252215 100644
--- a/common.h
+++ b/common.h
@@ -6,6 +6,7 @@
 #include <alloca.h>
 #include <math.h>
 #include <stddef.h>
+#include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
 
@@ -30,4 +31,16 @@ struct libglitter_render_context {
 };
 
 
+#ifdef TEST
+
+# define ASSERT(ASSERTION)\
+	do {\
+		if (!(ASSERTION)) {\
+			fprintf(stderr, "Failed assertion at line %i: %s\n", __LINE__, #ASSERTION);\
+			exit(1);\
+		}\
+	} while (0)
+
+#endif
+
 #endif