[v2 2/3] test-lib: Add dummy subject to force empty subject

[Jesse Rosenthal]

At the moment, the test-lib fills in any missing headers. This makes
it impossible to test our handling of empty subjects. This will
allow us to use a special dummy subject -- `@FORCE_EMPTY` -- to force
the subject to remain empty.
---
 test/test-lib.sh | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/test/test-lib.sh b/test/test-lib.sh
index 53db9ca..6057238 100644
--- a/test/test-lib.sh
+++ b/test/test-lib.sh
@@ -368,6 +368,8 @@ generate_message ()
 	else
 	    template[subject]="Test message #${gen_msg_cnt}"
 	fi
+    elif [ "${template[subject]}" = "@FORCE_EMPTY" ]; then
+	template[subject]=""
     fi
 
     if [ -z "${template[date]}" ]; then
-- 
2.1.2