public function testSetTransport()
{
$this->assertSame($this->transport, $this->mailService->getTransport());
$anotherTransport = new MockTransport();
$this->assertSame($this->mailService, $this->mailService->setTransport($anotherTransport));
$this->assertSame($anotherTransport, $this->mailService->getTransport());
}