test: Improve grammar in test-message subjects.

Before codifying these in any expected test output, I'd like them to
at least resemble English.

diff --git a/test/notmuch-test b/test/notmuch-test
index f0c0aad6ea6cb4ecfc723198d77b27fc1931c092..c6703f0e52b42edfedb228423c8f9bca74275a8f 100755 (executable)
--- a/test/notmuch-test
+++ b/test/notmuch-test
@@ -94,7 +94,7 @@ generate_message ()
     fi
 
     if [ -z "${template[body]}" ]; then
-       template[body]="This is just test message (#${gen_msg_cnt})"
+       template[body]="This is just a test message (#${gen_msg_cnt})"
     fi
 
     if [ -z "${template[from]}" ]; then