Sample Customer Service Unit Test with DI Container

CustomerServiceTest.php

<?php
//..
class CustomerServiceTest extends TestCase
{
    //..
     protected function makeProphecy($classOrInstance) : void {
        if($classOrInstance === null){
            return ;
        }
        $a = function () use($classOrInstance){
            return $this->prophesize($classOrInstance);
        };
        $this->c->singletonize($classOrInstance, \Closure::bind($a, $this));
    }
    protected function setUp()
    {
        //some setup here
        $this->makeProphecy(CustomerRepositoryInterface::class);
        $this->c['CustomerService'] = function ($c) {
            return new CustomerService($c[CustomerRepositoryInterface::class]->reveal());
        };
        $this->customer = $this->objectMother->getUnSavedCustomer();
        $this->savedCustomer = $this->objectMother->getCustomer();
    }
    //...
}