$payment->setPaymentReminderSendStatus(true)->save();

$this->orderPaymentMockSend->expects($this->once())
    ->method('setPaymentReminderSendStatus')
    ->with($paymentReminderSentStatus)
    ->willReturnSelf()
;

$this->orderPaymentMockSend = $this->getMockBuilder(Payment::class)
    ->disableOriginalConstructor()
    ->setMethods(['setPaymentReminderSendStatus'])
    ->getMock()
;

/** Mock Customer */
    //Add a magic method to the list of mocked class methods
    $methods = array_merge(
        get_class_methods(Customer::class),
        ['getCustomerType']
    );

    $this->customerModelMock = $this->getMockBuilder(Customer::class)
        ->setMethods($methods)
        ->disableOriginalConstructor()
        ->getMock();

    //Now I can mock my magic method !
    $this->customerModelMock->expects(static::any())
        ->method('getCustomerType')
        ->willReturn('professional');