Sample code using Laravel, PHPUnit and Mockery

SampleTest.php

/**
 * @runInSeparateProcess
 * @preserveGlobalState disabled
 */
public function testEditWhenRecordNotFound()
{
    $this->mock = M::mock('alias:App\Contact')->makePartial();

    $this->mock->shouldReceive('find')->once()->with(self::ID)->andReturnUsing(function(){
            return null;
    });

    $response = $this->get('/contacts/' . self::ID . '/edit');
    $response->assertRedirect('/contacts');
}