Unset GIT_EDITOR while running tests.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/t/test-lib.sh b/t/test-lib.sh
index 78d7e87..cc1253c 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -11,6 +11,7 @@
 export LANG LC_ALL PAGER TZ
 EDITOR=:
 VISUAL=:
+unset GIT_EDITOR
 unset AUTHOR_DATE
 unset AUTHOR_EMAIL
 unset AUTHOR_NAME