public function testAttachFile()
{
$message = new Message();
$fileName = __FILE__;
$message->attach($fileName);
$attachments = $message->getAttachments();
$this->assertCount(1, $attachments);
$attachment = $attachments[0];
$this->assertEquals($attachment['name'], basename($fileName));
$this->assertEquals($attachment['type'], \yii\helpers\FileHelper::getMimeType($fileName));
$this->assertEquals($attachment['data'], base64_encode(file_get_contents($fileName)));
$message->attach($fileName);
$attachments = $message->getAttachments();
$this->assertCount(2, $attachments);
}
