+
+test_begin_subtest "Xapian exception: read only files"
+chmod u-w ${MAIL_DIR}/.notmuch/xapian/*.${db_ending}
+output=$(NOTMUCH_NEW --debug 2>&1 | sed 's/: .*$//' )
+chmod u+w ${MAIL_DIR}/.notmuch/xapian/*.${db_ending}
+test_expect_equal "$output" "A Xapian exception occurred opening database"
+
+
+test_begin_subtest "Handle files vanishing between scandir and add_file"
+
+# A file for scandir to find. It won't get indexed, so can be empty.
+touch ${MAIL_DIR}/vanish
+
+# Breakpoint to remove the file before indexing
+cat <<EOF > notmuch-new-vanish.gdb
+set breakpoint pending on
+set logging file notmuch-new-vanish-gdb.log
+set logging on
+break notmuch_database_index_file
+commands
+shell rm -f ${MAIL_DIR}/vanish
+continue
+end
+run
+EOF
+
+${TEST_GDB} --batch-silent --return-child-result -x notmuch-new-vanish.gdb \
+ --args notmuch new 2>OUTPUT 1>/dev/null
+echo "exit status: $?" >> OUTPUT
+
+# Clean up the file in case gdb isn't available.
+rm -f ${MAIL_DIR}/vanish
+
+cat <<EOF > EXPECTED
+Unexpected error with file ${MAIL_DIR}/vanish
+add_file: Something went wrong trying to read or write a file
+Error opening ${MAIL_DIR}/vanish: No such file or directory
+exit status: 75
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
+add_email_corpus broken
+test_begin_subtest "reference loop does not crash"
+test_expect_code 0 "notmuch show --format=json id:mid-loop-12@example.org id:mid-loop-21@example.org > OUTPUT"
+
+test_begin_subtest "reference loop ordered by date"
+threadid=$(notmuch search --output=threads id:mid-loop-12@example.org)
+notmuch show --format=mbox $threadid | grep '^Date' > OUTPUT
+cat <<EOF > EXPECTED
+Date: Thu, 16 Jun 2016 22:14:41 -0400
+Date: Fri, 17 Jun 2016 22:14:41 -0400
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+