public function testAddFields()
{
$table = $this->object->table('users');
$fieldsBefore = $table->fields();
$table->addFields(array('new' => 'string', 'fields' => 'integer'));
$fieldsAfter = $table->fields();
$this->assertArraySubset(['id', 'name', 'email'], $fieldsBefore, true);
$this->assertArraySubset(['id', 'name', 'email', 'new', 'fields'], $fieldsAfter, true);
}