Somehow, Aspell 0.60.6.1 and aspell-dict-en-2016.11.20-0 don't consider
this a valid spelling.  Skip it.

TODO: Migrate to using hunspell. According to upstream, this bug won't be fixed.
See https://bugzilla.gnome.org/show_bug.cgi?id=772406.
--- a/testsuite/test-checker.c	2017-03-24 09:50:50.000000000 -0400
+++ b/testsuite/test-checker.c	2017-06-15 21:47:07.116173895 -0400
@@ -105,10 +105,11 @@
 	 * be considered deprecated, it is better to use hunspell, so WONTFIX.
 	 * For more details, see:
 	 * https://bugzilla.gnome.org/show_bug.cgi?id=772406
+	 *
+	 * correctly_spelled = gspell_checker_check_word (checker, "spell-checking", -1, &error);
+	 * g_assert_no_error (error);
+	 * g_assert (correctly_spelled);
 	 */
-	correctly_spelled = gspell_checker_check_word (checker, "spell-checking", -1, &error);
-	g_assert_no_error (error);
-	g_assert (correctly_spelled);
 
 	correctly_spelled = gspell_checker_check_word (checker, "nrst-auie", -1, &error);
 	g_assert_no_error (error);
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