Check for no warnings in grade report.

diff --git a/tests/Makefile b/tests/Makefile
index ce0399b2e0ca7a8cf078696e148550426ac39bea..705472f8aa420b5dbd944bde9e795270c8c38db7 100644 (file)
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -26,7 +26,9 @@ endef
 
 define run-tests-grade
 cd $@/src/$(PROJECT) && $(MAKE) check
-cd $@/src/$(PROJECT) && $(MAKE) grade && grep -q PERFECT build/grade
+cd $@/src/$(PROJECT) && $(MAKE) grade
+cd $@/src/$(PROJECT) && grep -q PERFECT build/grade
+cd $@/src/$(PROJECT) && ! grep -q warning build/grade
 endef
 
 define compile