ci: move tests than can be run in parallel now (#3038)

test/tests/parallel/set3/mta/lmtp_ip.bats

@@ -0,0 +1,51 @@
+load "${REPOSITORY_ROOT}/test/helper/common"
+load "${REPOSITORY_ROOT}/test/helper/setup"
+
+# Originally contributed Jan 2017:
+# https://github.com/docker-mailserver/docker-mailserver/pull/461
+# Refactored with additional insights:
+# https://github.com/docker-mailserver/docker-mailserver/pull/3004
+
+# NOTE: Purpose of feature is to use an ENV instead of providing a `postfix-main.cf`
+# to configure a URI for sending mail to an alternative LMTP server.
+# TODO: A more appropriate test if keeping this feature would be to run Dovecot via a
+# separate container to deliver mail to, and verify it was stored in the expected mail dir.
+
+BATS_TEST_NAME_PREFIX='[ENV] (POSTFIX_DAGENT) '
+CONTAINER_NAME='dms-test_env_postfix-dagent'
+
+function setup_file() {
+  export LMTP_URI='lmtp:127.0.0.1:24'
+  _init_with_defaults
+
+  local CONTAINER_ARGS_ENV_CUSTOM=(
+    --env PERMIT_DOCKER='container'
+    --env POSTFIX_DAGENT="${LMTP_URI}"
+  )
+
+  # Configure LMTP service listener in `/etc/dovecot/conf.d/10-master.conf` to instead listen on TCP port 24:
+  mv "${TEST_TMP_CONFIG}/dovecot-lmtp/user-patches.sh" "${TEST_TMP_CONFIG}/"
+
+  _common_container_setup 'CONTAINER_ARGS_ENV_CUSTOM'
+}
+
+function teardown_file() { _default_teardown ; }
+
+@test "should have updated the value of 'main.cf:virtual_transport'" {
+  _run_in_container grep "virtual_transport = ${LMTP_URI}" /etc/postfix/main.cf
+  assert_success
+}
+
+@test "delivers mail to existing account" {
+  _wait_for_smtp_port_in_container
+
+  # Send a test mail:
+  _run_in_container_bash "nc 0.0.0.0 25 < /tmp/docker-mailserver-test/email-templates/existing-user1.txt"
+  assert_success
+
+  # Verify delivery was successful, log line should look similar to:
+  # postfix/lmtp[1274]: 0EA424ABE7D9: to=<user1@localhost.localdomain>, relay=127.0.0.1[127.0.0.1]:24, delay=0.13, delays=0.07/0.01/0.01/0.05, dsn=2.0.0, status=sent (250 2.0.0 <user1@localhost.localdomain> ixPpB+Zvv2P7BAAAUi6ngw Saved)
+  local MATCH_LOG_LINE='postfix/lmtp.* status=sent .* Saved)'
+  run timeout 60 docker exec "${CONTAINER_NAME}" bash -c "tail -F /var/log/mail/mail.log | grep --max-count 1 '${MATCH_LOG_LINE}'"
+  assert_success
+}