test/unit: print same messages when running all or individual unit tests

- some explanatory comments in Makefile

test/unit/Makefile

@@ -4,32 +4,37 @@ TESTS_FILES ?= $(wildcard *.sh)
 TESTS_EXCLUDE ?=
 TESTS ?= $(filter-out $(patsubst %,%.sh,$(TESTS_EXCLUDE)), $(TESTS_FILES))
 
+# run all tests
 all:
 	@for FILE in $(TESTS) ; do \
 		if [ -f $$FILE ] ; then \
 			if [ -x $$FILE ] ; then \
-				echo "run test `basename $$FILE .sh`:" `head -n 2 "$$FILE" | tail -n 1 | cut -c 3-` ; \
+				echo "Run test `basename $$FILE .sh`:" `head -n 2 "$$FILE" | tail -n 1 | cut -c 3-` ; \
 				./$$FILE ; \
 				ret=$$? ; \
-					if [ ! "$$ret" -eq 0 ] ; then \
-						echo "failed" ; RES=1;\
-					fi ; \
+				if [ ! "$$ret" -eq 0 ] ; then \
+					echo "Test unit file $$FILE: failed" ; \
+				else \
+					echo "Test unit file $$FILE: ok" ; \
+				fi ; \
 			fi ; \
 		fi ; \
 	done ; \
 	exit $$RES;
 
+# run one test specified in variable UNIT
+# example: make UNIT=1.sh run
 run:
 	-@if [ -f $(UNIT) ] ; then \
 		if [ -x $(UNIT) ] ; then \
 			echo "Run test `basename $(UNIT) .sh`:" `head -n 2 "$(UNIT)" | tail -n 1 | cut -c 3-` ; \
 			./$(UNIT) ; \
 			ret=$$? ; \
-				if [ ! "$$ret" -eq 0 ] ; then \
-					echo "Test unit file $(UNIT): failed" ; \
-				else \
-					echo "Test unit file $(UNIT): ok" ; \
-				fi ; \
+			if [ ! "$$ret" -eq 0 ] ; then \
+				echo "Test unit file $(UNIT): failed" ; \
+			else \
+				echo "Test unit file $(UNIT): ok" ; \
+			fi ; \
 		fi ; \
 	else \
 		echo "Test unit file $(UNIT): not found" ; \