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-rw-r--r--tests/join/Test.pm3
1 files changed, 3 insertions, 0 deletions
diff --git a/tests/join/Test.pm b/tests/join/Test.pm
index 6f0d3b758..e666a7510 100644
--- a/tests/join/Test.pm
+++ b/tests/join/Test.pm
@@ -117,6 +117,9 @@ my @tv = (
[t_subst "a:1\nb:1\n", t_subst "a:2:\nb:2:\n"],
t_subst "a:1:2:\nb:1:2:\n", 0],
+# FIXME: change this to ensure the diagnostic makes sense
+['invalid-j', '-j x', {}, "", 1],
+
);