tests(refactor): Conversion to parallel tests and use revised helpers

- Introduced `CONTAINER_NAME` and `TEST_NAME_PREFIX` as new vars for better managing test consistency (DRY).
- `CONTAINER_NAME` replaces any repeated container name with the variable. The value will differ slightly as the prior prefix (`mail_`) has been changed to `dms-test-`.
- `TEST_NAME_PREFIX` provides a prefix value for each `@test` description string.

---

chore: Add a reference template for tests

test/tests/parallel/set1/clamav.bats

@@ -3,29 +3,22 @@ load "${REPOSITORY_ROOT}/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}")
+  init_with_defaults
 
-  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}"
+  # Comment for maintainers about `PERMIT_DOCKER=host`:
+  # https://github.com/docker-mailserver/docker-mailserver/pull/2815/files#r991087509
+  local CUSTOM_SETUP_ARGUMENTS=(
+    --env ENABLE_CLAMAV=1
+    --env ENABLE_AMAVIS=1
+    --env PERMIT_DOCKER=host
+    --env AMAVIS_LOGLEVEL=2
+    --env CLAMAV_MESSAGE_SIZE_LIMIT=30M
+    --env LOG_LEVEL=trace
+  )
 
-  wait_for_finished_setup_in_container "${CONTAINER_NAME}"
+  common_container_setup 'CUSTOM_SETUP_ARGUMENTS'
 
   # wait for ClamAV to be fully setup or we will get errors on the log
   repeat_in_container_until_success_or_timeout 60 "${CONTAINER_NAME}" test -e /var/run/clamav/clamd.ctl
@@ -33,48 +26,46 @@ function setup_file() {
   wait_for_service "${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"
+  _run_in_container 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}"
-}
+function teardown_file() { _default_teardown ; }
 
 @test "${TEST_NAME_PREFIX} process clamd is running" {
-  "${RUN_COMMAND[@]}" bash -c "ps aux --forest | grep -v grep | grep '/usr/sbin/clamd'"
+  _run_in_container 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"
+  _run_in_container 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
+  _run_in_container 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"
+  _run_in_container 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$' /etc/clamav/clamd.conf
+  _run_in_container grep -q '^MaxFileSize 30M$' /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>'"
+  _run_in_container 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'"
+  _run_in_container bash -c "pkill clamd && sleep 10 && ps aux --forest | grep -v grep | grep '/usr/sbin/clamd'"
   assert_success
 }