Ar an ceathrú lá is fiche de mí na Nollaig, scríobh Stephen J. Turnbull: 
 I got tired of having "make check" stall on mule-tests. 
Something I
 don't understand is going on, because Skip-Test-Unless is failing the
 char-code-limit condition, but doing the test anyway.  The only thing
 I can think of is that Skip-Test-Unless is a macro but for some reason
 evaluates its condition anyway, which is a bug, but I'm not sure
 whether it's in XEmacs or in Skip-Test-Unless. 
It’s an error in my syntax calling Skip-Test-Unless. I’ve fixed this and
incorporated a change in test-harness.el so other people aren’t caught by
the same issue. Thanks for the bug report!
# HG changeset patch
# User Aidan Kehoe <kehoea(a)parhasard.net>
# Date 1514124997 0
#      Sun Dec 24 14:16:37 2017 +0000
# Node ID 75597c755b6716ef4ffa782f37650dd48792d6ea
# Parent  b5c15ce519c23670ffba7da0c365f5044e137d90
Call `Skip-Test-Unless' correctly, mule-test.el.
lisp/ChangeLog addition:
2017-12-24  Aidan Kehoe  <kehoea(a)parhasard.net>
	* test-harness.el (test-harness-from-buffer):
	Error in `Skip-Test-Unless' if BODY is not specified.
tests/ChangeLog addition:
2017-12-24  Aidan Kehoe  <kehoea(a)parhasard.net>
	* automated/mule-tests.el:
	Call Skip-Test-Unless correctly for #'test-chars, thank you
	Stephen Turnbull.
diff -r b5c15ce519c2 -r 75597c755b67 lisp/ChangeLog
--- a/lisp/ChangeLog	Fri Dec 22 21:39:11 2017 +0000
+++ b/lisp/ChangeLog	Sun Dec 24 14:16:37 2017 +0000
@@ -1,3 +1,8 @@
+2017-12-24  Aidan Kehoe  <kehoea(a)parhasard.net>
+
+	* test-harness.el (test-harness-from-buffer):
+	Error in `Skip-Test-Unless' if BODY is not specified.
+
 2017-12-22  Aidan Kehoe  <kehoea(a)parhasard.net>
 
 	* descr-text.el (describe-char-unicodedata-file):
diff -r b5c15ce519c2 -r 75597c755b67 lisp/test-harness.el
--- a/lisp/test-harness.el	Fri Dec 22 21:39:11 2017 +0000
+++ b/lisp/test-harness.el	Sun Dec 24 14:16:37 2017 +0000
@@ -379,6 +379,7 @@
 REASON is a description of the condition failure, and must be unique (it
 is used as a hash key).  DESCRIPTION describes the tests that were skipped.
 BODY is a sequence of expressions and may contain several tests."
+	(or body (error 'syntax-error "BODY omitted in `skip-test-unless'"))
 	`(if (not ,condition)
 	     (let ((count (gethash ,reason skipped-test-reasons)))
 	       (puthash ,reason (if (null count) 1 (1+ count))
diff -r b5c15ce519c2 -r 75597c755b67 tests/ChangeLog
--- a/tests/ChangeLog	Fri Dec 22 21:39:11 2017 +0000
+++ b/tests/ChangeLog	Sun Dec 24 14:16:37 2017 +0000
@@ -1,3 +1,9 @@
+2017-12-24  Aidan Kehoe  <kehoea(a)parhasard.net>
+
+	* automated/mule-tests.el:
+	Call Skip-Test-Unless correctly for #'test-chars, thank you
+	Stephen Turnbull.
+
 2017-12-02  Aidan Kehoe  <kehoea(a)parhasard.net>
 
 	* automated/keymap-tests.el:
diff -r b5c15ce519c2 -r 75597c755b67 tests/automated/mule-tests.el
--- a/tests/automated/mule-tests.el	Fri Dec 22 21:39:11 2017 +0000
+++ b/tests/automated/mule-tests.el	Sun Dec 24 14:16:37 2017 +0000
@@ -85,6 +85,7 @@
  ;; and the string means I run out of memory when I attempt to run this.
  (<= char-code-limit #x200000) 
  "CHAR-CODE-LIMIT is impractically large"
+ "check that all existing characters can be inserted into a buffer"
  ;; Run #'test-chars in byte-compiled mode only.
  (and (compiled-function-p (symbol-function 'test-chars)) (test-chars t)))
 
-- 
‘As I sat looking up at the Guinness ad, I could never figure out /
How your man stayed up on the surfboard after forty pints of stout’
(C. Moore)