patch 7.4.2082
Problem:    Not much test coverage for digraphs.
Solution:   Add a new style digraph test. (Christian Brabandt)
diff --git a/src/Makefile b/src/Makefile
index 80a15b9..316c0e6 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -2061,6 +2061,7 @@
 	test_cscope \
 	test_cursor_func \
 	test_delete \
+	test_digraph \
 	test_ex_undo \
 	test_execute_func \
 	test_expand \