You must set the following environment variables to run the tests:

  PDO_MYSQL_TEST_DSN  - DSN
    For example: mysql:dbname=test;host=localhost;port=3306

  PDO_MYSQL_TEST_HOST     - database host
  PDO_MYSQL_TEST_DB      - database (schema) name
  PDO_MYSQL_TEST_SOCKET  - database server socket
  PDO_MYSQL_TEST_ENGINE  - storage engine to use
  PDO_MYSQL_TEST_USER    - database user
  PDO_MYSQL_TEST_PASS    - database user password
  PDO_MYSQL_TEST_CHARSET - database charset

  NOTE: if any of PDO_MYSQL_TEST_[HOST|DB|SOCKET|ENGINE|CHARSET] is
  part of PDO_MYSQL_TEST_DSN, the values must match. That is, for example,
  for PDO_MYSQL_TEST_DSN = mysql:dbname=test you MUST set PDO_MYSQL_TEST_DB=test.
