-test_expect_success 'notmuch --help' 'notmuch --help'
-test_expect_success 'notmuch help' 'notmuch help'
-test_expect_success 'notmuch --version' 'notmuch --version'
+test_begin_subtest 'notmuch --help'
+test_expect_success 'notmuch --help'
+
+test_begin_subtest 'notmuch help'
+test_expect_success 'notmuch help'
+
+test_begin_subtest 'notmuch --version'
+test_expect_success 'notmuch --version'