How to post form data from Unit Test controller to custom controller | Magento 2

Question

I have a custom module with form. I want to post values from unit test file to my custom module controller.

I tried $this->request = $this->getMockBuilder(\Magento\Framework\App\RequestInterface::class) ->disableOriginalConstructor() ->setMethods(['getPost']) ->getMockForAbstractClass();

    $this->request->expects($this->any())->method('getPost')->will($this->returnSelf());

It passed POST check but how to pass variable to controller.

thanks in advance