mockExample.php

<?php

class Bob_Validator_BooleanTest extends PHPUnit_Framework_TestCase
{
    public function setUp() {
        $this->authorizerMock = $this->getMock(Authorizer::class);
        $this->authorizerMock->expects($this->once())
            ->method('authorize')->willReturn(true);
    }
    
    public testSomething() {
        $testObject = new Something($this->authorizerMock);
    }
}