Fix unit tests

tests/Makefile

@@ -1,27 +1,28 @@
 tests:
-	set -e; \
+	@set -e; \
 	for i in *-tests/Makefile; do \
+		$(MAKE) -C $$(dirname $$i) -j clean; \
 		echo '==== Making:' $$(dirname $$i); \
 		$(MAKE) -C $$(dirname $$i) -j; \
 	done
 
 debugtest:
-	set -e; \
+	@set -e; \
 	$(MAKE) clean; \
 	$(MAKE) -C debug-mode -j; \
 	debug-mode/debug-tests.out
 
 runtests: debugtest
-	$(MAKE) clean
-	$(MAKE) tests
-	set -e; \
+	@$(MAKE) clean
+	@$(MAKE) tests
+	@set -e; \
 	for i in *-tests/Makefile; do \
 		echo '==== Running:' $$(dirname $$i); \
 		$$(dirname $$i)/$$(dirname $$i).out; \
 	done
 
 clean:
-	set -e; \
+	@set -e; \
 	for i in *-tests/Makefile; do \
 		echo '==== Cleaning:' $$(dirname $$i); \
 		$(MAKE) -C $$(dirname $$i) clean; \