diff --git a/Makefile b/Makefile
index 1c2f0d78c..431bbfaf4 100644
--- a/Makefile
+++ b/Makefile
@@ -93,11 +93,17 @@ libbacktrace:
 
 # builds and runs the test suite
 test: | build deps
-	echo fake test completed!
+	$(ENV_SCRIPT) nim test $(NIM_PARAMS) nimbus.nims
 
 # primitive reproducibility test
 test-reproducibility:
-	echo fake reproducability test completed!
+	+ [ -e build/nimbus ] || $(MAKE) V=0 nimbus; \
+		MD5SUM1=$$($(MD5SUM) build/nimbus | cut -d ' ' -f 1) && \
+		rm -rf nimcache/*/nimbus && \
+		$(MAKE) V=0 nimbus && \
+		MD5SUM2=$$($(MD5SUM) build/nimbus | cut -d ' ' -f 1) && \
+		[ "$$MD5SUM1" = "$$MD5SUM2" ] && echo -e "\e[92mSuccess: identical binaries.\e[39m" || \
+			{ echo -e "\e[91mFailure: the binary changed between builds.\e[39m"; exit 1; }
 
 # usual cleaning
 clean: | clean-common