t/t3800-mktag.sh: use test_must_fail rather than '!'

diff --git a/t/t6006-rev-list-format.sh b/t/t6006-rev-list-format.sh
index 1e4541afea07daa094895244f0e49803623cd1cd..0dc915ea67b21d07d8e4dca44767906e05ad2278 100755 (executable)
--- a/t/t6006-rev-list-format.sh
+++ b/t/t6006-rev-list-format.sh
@@ -139,4 +139,14 @@ commit 131a310eb913d107dd3c09a65d1651175898735d
 commit 86c75cfd708a0e5868dc876ed5b8bb66c80b4873
 EOF
 
+test_expect_success 'empty email' '
+       test_tick &&
+       C=$(GIT_AUTHOR_EMAIL= git commit-tree HEAD^{tree} </dev/null) &&
+       A=$(git show --pretty=format:%an,%ae,%ad%n -s $C) &&
+       test "$A" = "A U Thor,,Thu Apr 7 15:14:13 2005 -0700" || {
+               echo "Eh? $A" >failure
+               false
+       }
+'
+
 test_done