Mock

gistfile1.php

public function testFormattingDatesBasedOnConfig()
    {
        $stub = $this->getMock('Henry\Config',array('get'));
        $stub->expects($this->any())
             ->method('get')
             ->will($this->returnValue('c'));

        $formatter = new DateFormatter($stub);

        $this->assertEquals('c',$stub->get('param'));
    }