https://github.com/georgmartius/vid.stab/pull/69

From dff58ee5a26569a7eeb881d204b428ee5da40746 Mon Sep 17 00:00:00 2001
From: Craig Andrews <candrews@integralblue.com>
Date: Thu, 10 Jan 2019 13:47:10 -0500
Subject: [PATCH] tests should exit with code 0 on success

Exit code 0 indicates success, anything else indicates failure. Therefore, unittest_summary() should return 0 if no tests failed.
---
 tests/testframework.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/testframework.c b/tests/testframework.c
index a38851c..a889560 100644
--- a/tests/testframework.c
+++ b/tests/testframework.c
@@ -36,7 +36,7 @@ int unittest_summary(){
   fprintf(stderr, "UNIT TESTs succeeded:\t %s%i/%i\033[0m\n",
           units_failed>0 ? "\033[1;31m" : "\033[1;32m",
           units_success, units_success + units_failed);
-  return units_failed==0;
+  return units_failed!=0;
 
 }