patch 8.0.1186: still quite a few old style tests

Problem:    Still quite a few old style tests.
Solution:   Convert old to new style tests. (Yegappan Lakshmanan)
            Avoid ringing the bell while running tests.
diff --git a/src/Makefile b/src/Makefile
index 06204bd..7752fa1 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -2100,14 +2100,14 @@
 	test_listchars \
 	test_search_mbyte \
 	test_wordcount \
-	test3 test4 test5 test7 test8 \
+	test3 test8 \
 	test11 test12 test14 test15 test17 test19 \
 	test20 test25 test28 test29 \
-	test30 test31 test32 test34 test36 test37 test38 test39 \
+	test30 test32 test34 test36 test37 test38 test39 \
 	test40 test42 test44 test45 test48 test49 \
 	test50 test52 test54 test55 test59 \
-	test60 test64 test66 test68 test69 \
-	test70 test72 test73 test77 test78 test79 \
+	test64 test66 test68 test69 \
+	test70 test72 test73 test77 test79 \
 	test83 test85 test86 test87 test88 \
 	test94 test95 test99 \
 	test108:
@@ -2149,6 +2149,7 @@
 	test_ex_z \
 	test_exec_while_if \
 	test_execute_func \
+	test_exists \
 	test_exists_autocmd \
 	test_expand \
 	test_expand_dllpath \
@@ -2279,6 +2280,7 @@
 	test_virtualedit \
 	test_visual \
 	test_winbar \
+	test_winbuf_close \
 	test_window_cmd \
 	test_window_id \
 	test_windows_home \