git-am.sh: fix initialization of the threeway variable

diff --git a/t/t4202-log.sh b/t/t4202-log.sh
index 85230a87b4d5a22c499b3af5e5b967f02c7423f6..1b2e981a0011d520d1a7d8bb8d0a5fd7892bacc4 100755 (executable)
--- a/t/t4202-log.sh
+++ b/t/t4202-log.sh
@@ -867,4 +867,8 @@ test_expect_success GPG 'log --graph --show-signature for merged tag' '
        grep "^| | gpg: Good signature" actual
 '
 
+test_expect_success 'log --graph --no-walk is forbidden' '
+       test_must_fail git log --graph --no-walk
+'
+
 test_done