tests(chore): Rename test files to serial and parallel types

- `test_helper.bats` needs more work than this PR provides to be compatible with parallel tests, so must remain as a serial test for now.
- `spam_bounced.bats` had failures as a serial test, but works well converted to a parallel test in a future commit.

test/tests/parallel/set1/clamav.bats

@@ -0,0 +1,79 @@
+load 'test_helper/common'
+
+TEST_NAME_PREFIX='ClamAV:'
+CONTAINER_NAME='dms-test-clamav'
+RUN_COMMAND=('run' 'docker' 'exec' "${CONTAINER_NAME}")
+
+function setup_file() {
+  local PRIVATE_CONFIG
+  PRIVATE_CONFIG=$(duplicate_config_for_container . "${CONTAINER_NAME}")
+
+  docker run --rm --detach --tty \
+    --name "${CONTAINER_NAME}" \
+    --hostname mail.my-domain.com \
+    --volume "${PRIVATE_CONFIG}:/tmp/docker-mailserver" \
+    --volume "${PWD}/test/test-files:/tmp/docker-mailserver-test:ro" \
+    --env ENABLE_AMAVIS=1 \
+    --env AMAVIS_LOGLEVEL=2 \
+    --env ENABLE_CLAMAV=1 \
+    --env ENABLE_UPDATE_CHECK=0 \
+    --env ENABLE_SPAMASSASSIN=0 \
+    --env ENABLE_FAIL2BAN=0 \
+    --env PERMIT_DOCKER=host \
+    --env CLAMAV_MESSAGE_SIZE_LIMIT=30M \
+    --env LOG_LEVEL=debug \
+    "${IMAGE_NAME}"
+
+  wait_for_finished_setup_in_container "${CONTAINER_NAME}"
+
+  # wait for ClamAV to be fully setup or we will get errors on the log
+  repeat_in_container_until_success_or_timeout 60 "${CONTAINER_NAME}" test -e /var/run/clamav/clamd.ctl
+
+  wait_for_service "${CONTAINER_NAME}" postfix
+  wait_for_smtp_port_in_container "${CONTAINER_NAME}"
+
+  "${RUN_COMMAND[@]}" bash -c "nc 0.0.0.0 25 < /tmp/docker-mailserver-test/email-templates/amavis-virus.txt"
+  assert_success
+
+  wait_for_empty_mail_queue_in_container "${CONTAINER_NAME}"
+}
+
+function teardown_file() {
+  docker rm -f "${CONTAINER_NAME}"
+}
+
+@test "${TEST_NAME_PREFIX} process clamd is running" {
+  "${RUN_COMMAND[@]}" bash -c "ps aux --forest | grep -v grep | grep '/usr/sbin/clamd'"
+  assert_success
+}
+
+@test "${TEST_NAME_PREFIX} log files exist at /var/log/mail directory" {
+  "${RUN_COMMAND[@]}" bash -c "ls -1 /var/log/mail/ | grep -E 'clamav|freshclam|mail.log'| wc -l"
+  assert_success
+  assert_output 3
+}
+
+@test "${TEST_NAME_PREFIX} should be identified by Amavis" {
+  "${RUN_COMMAND[@]}" grep -i 'Found secondary av scanner ClamAV-clamscan' /var/log/mail/mail.log
+  assert_success
+}
+
+@test "${TEST_NAME_PREFIX} freshclam cron is enabled" {
+  "${RUN_COMMAND[@]}" bash -c "grep '/usr/bin/freshclam' -r /etc/cron.d"
+  assert_success
+}
+
+@test "${TEST_NAME_PREFIX} env CLAMAV_MESSAGE_SIZE_LIMIT is set correctly" {
+  "${RUN_COMMAND[@]}" grep -q '^MaxFileSize 30M$' /etc/clamav/clamd.conf
+  assert_success
+}
+
+@test "${TEST_NAME_PREFIX} rejects virus" {
+  "${RUN_COMMAND[@]}" bash -c "grep 'Blocked INFECTED' /var/log/mail/mail.log | grep '<virus@external.tld> -> <user1@localhost.localdomain>'"
+  assert_success
+}
+
+@test "${TEST_NAME_PREFIX} process clamd restarts when killed" {
+  "${RUN_COMMAND[@]}" bash -c "pkill clamd && sleep 10 && ps aux --forest | grep -v grep | grep '/usr/sbin/clamd'"
+  assert_success
+}

test/tests/parallel/set1/default_relay_host.bats

@@ -0,0 +1,28 @@
+load 'test_helper/common'
+
+function setup() {
+  local PRIVATE_CONFIG
+  PRIVATE_CONFIG=$(duplicate_config_for_container relay-hosts)
+
+  docker run -d --name mail_with_default_relay \
+    -v "${PRIVATE_CONFIG}":/tmp/docker-mailserver \
+    -v "$(pwd)/test/test-files":/tmp/docker-mailserver-test:ro \
+    -e DEFAULT_RELAY_HOST=default.relay.host.invalid:25 \
+    -e PERMIT_DOCKER=host \
+    -h mail.my-domain.com -t "${NAME}"
+
+    wait_for_finished_setup_in_container mail_with_default_relay
+}
+
+function teardown() {
+  docker rm -f mail_with_default_relay
+}
+
+#
+# default relay host
+#
+
+@test "checking default relay host: default relay host is added to main.cf" {
+  run docker exec mail_with_default_relay /bin/sh -c 'grep -e "^relayhost =" /etc/postfix/main.cf'
+  assert_output 'relayhost = default.relay.host.invalid:25'
+}

test/tests/parallel/set2/spam_bounced.bats

@@ -0,0 +1,49 @@
+load 'test_helper/common'
+# Globals referenced from `test_helper/common`:
+# TEST_NAME
+
+# Can run tests in parallel?: No
+# Shared static container name: TEST_NAME
+
+# Test case
+# ---------
+# When SPAMASSASSIN_SPAM_TO_INBOX=0, spam messages must be bounced (rejected).
+# SPAMASSASSIN_SPAM_TO_INBOX=1 is covered in `mail_spam_junk_folder.bats`.
+# Original test PR: https://github.com/docker-mailserver/docker-mailserver/pull/1485
+
+function teardown() {
+  docker rm -f "${TEST_NAME}"
+}
+
+function setup_file() {
+  init_with_defaults
+}
+
+# Not used
+# function teardown_file() {
+# }
+
+@test "checking amavis: spam message is bounced (rejected)" {
+  # shellcheck disable=SC2034
+  local TEST_DOCKER_ARGS=(
+    --env ENABLE_SPAMASSASSIN=1
+    --env PERMIT_DOCKER=container
+    --env SPAMASSASSIN_SPAM_TO_INBOX=0
+  )
+
+  common_container_setup 'TEST_DOCKER_ARGS'
+
+  _should_bounce_spam
+}
+
+function _should_bounce_spam() {
+  wait_for_smtp_port_in_container_to_respond "${TEST_NAME}"
+
+  # send a spam message
+  run docker exec "${TEST_NAME}" /bin/sh -c "nc 0.0.0.0 25 < /tmp/docker-mailserver-test/email-templates/amavis-spam.txt"
+  assert_success
+
+  # message will be added to a queue with varying delay until amavis receives it
+  run repeat_until_success_or_timeout 60 sh -c "docker logs ${TEST_NAME} | grep 'Blocked SPAM {NoBounceInbound,Quarantined}'"
+  assert_success
+}

test/tests/parallel/set3/dovecot_inet_protocol.bats

@@ -0,0 +1,54 @@
+load 'test_helper/common'
+
+function setup_file() {
+  local PRIVATE_CONFIG
+  export ALL IPV4 IPV6
+
+  PRIVATE_CONFIG=$(duplicate_config_for_container . "${IPV4}")
+  ALL="mail_dovecot_all_protocols"
+  IPV4="mail_dovecot_ipv4"
+  IPV6="mail_dovecot_ipv6"
+
+  docker run --rm -d --name "${ALL}" \
+    -v "${PRIVATE_CONFIG}":/tmp/docker-mailserver \
+    -e DOVECOT_INET_PROTOCOLS= \
+    -h mail.my-domain.com \
+    -t "${NAME}"
+
+  docker run --rm -d --name "${IPV4}" \
+    -v "${PRIVATE_CONFIG}":/tmp/docker-mailserver \
+    -e DOVECOT_INET_PROTOCOLS=ipv4 \
+    -h mail.my-domain.com \
+    -t "${NAME}"
+
+  docker run --rm -d --name "${IPV6}" \
+    -v "${PRIVATE_CONFIG}":/tmp/docker-mailserver \
+    -e DOVECOT_INET_PROTOCOLS=ipv6 \
+    -h mail.my-domain.com \
+    -t "${NAME}"
+}
+
+@test 'checking dovecot IP configuration' {
+  wait_for_finished_setup_in_container "${ALL}"
+  run docker exec "${ALL}" grep '^#listen = \*, ::' /etc/dovecot/dovecot.conf
+  assert_success
+  assert_output '#listen = *, ::'
+}
+
+@test 'checking dovecot IPv4 configuration' {
+  wait_for_finished_setup_in_container "${IPV4}"
+  run docker exec "${IPV4}" grep '^listen = \*$' /etc/dovecot/dovecot.conf
+  assert_success
+  assert_output 'listen = *'
+}
+
+@test 'checking dovecot IPv6 configuration' {
+  wait_for_finished_setup_in_container "${IPV6}"
+  run docker exec "${IPV6}" grep '^listen = \[::\]$' /etc/dovecot/dovecot.conf
+  assert_success
+  assert_output 'listen = [::]'
+}
+
+function teardown_file {
+  docker rm -f "${ALL}" "${IPV4}" "${IPV6}"
+}

test/tests/parallel/set3/helper-functions.bats

@@ -0,0 +1,30 @@
+load 'test_helper/common'
+
+function setup_file() {
+  local PRIVATE_CONFIG
+  PRIVATE_CONFIG=$(duplicate_config_for_container .)
+
+  docker run -d --name mail_helper_functions \
+    --cap-add=NET_ADMIN \
+    -v "${PRIVATE_CONFIG}":/tmp/docker-mailserver \
+    -v "$(pwd)/test/test-files":/tmp/docker-mailserver-test:ro \
+    -e ENABLE_FETCHMAIL=1 \
+    -h mail.my-domain.com -t "${NAME}"
+
+  wait_for_finished_setup_in_container mail_helper_functions
+}
+
+function teardown_file() {
+    docker rm -f mail_helper_functions
+}
+
+@test "check helper functions (network.sh): _sanitize_ipv4_to_subnet_cidr" {
+    run docker exec mail_helper_functions bash -c "source /usr/local/bin/helpers/index.sh; _sanitize_ipv4_to_subnet_cidr 255.255.255.255/0"
+    assert_output "0.0.0.0/0"
+
+    run docker exec mail_helper_functions bash -c "source /usr/local/bin/helpers/index.sh; _sanitize_ipv4_to_subnet_cidr 192.168.255.14/20"
+    assert_output "192.168.240.0/20"
+
+    run docker exec mail_helper_functions bash -c "source /usr/local/bin/helpers/index.sh; _sanitize_ipv4_to_subnet_cidr 192.168.255.14/32"
+    assert_output "192.168.255.14/32"
+}