Improve t6029 to check the real "subtree" case

diff --git a/t/t4013-diff-various.sh b/t/t4013-diff-various.sh
index 4e7d68dda28a54cdc4f46e11717e113fa8dd479c..6b4d1c52bbf1e3edf01dd67794bf221effc581a7 100755 (executable)
--- a/t/t4013-diff-various.sh
+++ b/t/t4013-diff-various.sh
@@ -243,6 +243,9 @@ format-patch --inline --stdout initial..side
 format-patch --inline --stdout initial..master^
 format-patch --inline --stdout initial..master
 format-patch --inline --stdout --subject-prefix=TESTCASE initial..master
+config format.subjectprefix DIFFERENT_PREFIX
+format-patch --inline --stdout initial..master^^
+format-patch --stdout --cover-letter -n initial..master^
 
 diff --abbrev initial..side
 diff -r initial..side