Without this:

  $configArray['environments']['test'] = [
      'adapter'    => 'sqlite',
      'connection' => $pdo,
+     'name' => ':memory:',
  ];

I'm getting error: Undefined array key "name" in vendor/robmorgan/phinx/src/Phinx/Db/Adapter/SQLiteAdapter.php:207 here:

as mentioned here:

... It is also important to pass the database name too, as Phinx requires this for certain methods such as hasTable():

and here:

... However remember to also pass the database name as Phinx cannot infer this from the PDO connection.