--- a/Makefile
+++ b/Makefile
@@ -1,13 +1,6 @@
-
-%.o: %.cc
-	g++ -c -I. $^
-
-test1: test1.o
-	g++ -o test1 test1.o
-
-run_tests: test1 test1.req
-	./test1 > test1.res
-	@diff test1.res test1.req
+check: test_tree
+	./test_tree > mytest.output && \
+	diff -Nu test_tree.output mytest.output
 	@echo "*** All tests OK ***"
 
 clean:
--- a/test_tree.output
+++ b/test_tree.output
@@ -1,3 +1,8 @@
+-----
+hi
+  1
+  0
+-----
 empty tree to begin with:
 0
  'more text' is sibling 2 in its sibling range
@@ -309,3 +314,5 @@
     D
       I
 -----
+G
+H