introduce GIT_WORK_TREE to specify the work tree

diff --git a/t/t4013-diff-various.sh b/t/t4013-diff-various.sh
index 488e075c16611e5e6132744939574cdd878c3959..8f4c29a6b5a263d6f18d95757b76ac55e9443068 100755 (executable)
--- a/t/t4013-diff-various.sh
+++ b/t/t4013-diff-various.sh
@@ -241,6 +241,7 @@ format-patch --attach --stdout initial..master
 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
 
 diff --abbrev initial..side
 diff -r initial..side