/** * @return void */ public function testSendMailContainsHeader() { $mailTransfer = new MailTransfer(); $mailTransfer->addHeader((new MailHeaderTransfer())->setKey('Header 1')->setValue('Value 1')); $this->mandrillMock->messages->expects($this->once())->method('sendTemplate')->with($this->anything(), $this->anything(), $this->arrayContainsKeyEqualTo('headers', ['Header 1' => 'Value 1']), $this->anything(), $this->anything(), $this->anything()); $this->mailSender->sendMail($mailTransfer); }