patch 8.0.0242: no tests for user command completion

Problem:    Completion of user defined functions is not covered by tests.
Solution:   Add tests.  Also test various errors of user-defined commands.
            (Dominique Pelle, closes #1413)
diff --git a/src/version.c b/src/version.c
index 08b5dec..df3ff07 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    242,
+/**/
     241,
 /**/
     240,