test: add regression test for n_m_get_header

This function already catches Xapian exceptions, and we want to make
sure it stays that way.

diff --git a/test/T560-lib-error.sh b/test/T560-lib-error.sh
index 6432faaa8847d4ad05054efecf3cdfac35fa2a7b..777eb375ed4c486a30eec533c1c78ef81a6b37aa 100755 (executable)
--- a/test/T560-lib-error.sh
+++ b/test/T560-lib-error.sh
@@ -371,4 +371,20 @@ cat <<EOF > EXPECTED
 EOF
 test_expect_equal_file EXPECTED OUTPUT
 
+test_begin_subtest "Handle getting header from closed database"
+cat c_head2 - c_tail <<'EOF' | test_C ${MAIL_DIR}
+    {
+        const char *from;
+        from=notmuch_message_get_header (message, "from");
+        printf("%s\n%d\n", id, from == NULL);
+    }
+EOF
+cat <<EOF > EXPECTED
+== stdout ==
+1258471718-6781-1-git-send-email-dottedmag@dottedmag.net
+1
+== stderr ==
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
 test_done