PHPUnit Mock several different methods

I am new to Unit test and I am experimenting with PHPUnit framework.

I have a function that calls two other functions:

class Dummy{
    public function dummyFunction(){
        $this->anotherDummyFunction();
        .....
        $this->yetAnotherDummyFunction();
    }
    public function anotherDummyFunction(){

        .....

    }
    public function yetAnotherDummyFunction(){

        .....

    }
}

      

        
        
        
      

    

I want to check that two functions are called when dummyFunction () is called.

Here's the test class:

class TestDummyClass {
    public function testDummyFunction(){

        $dummyClassMock = $this->getMockBuilder('Dummy')
                     ->setMethods( array( 'anotherDummyFunction','yetAnotherDummyFunction' ) )
                     ->getMock();

        $dummyClassMock->expects($this->once())
             ->method( 'anotherDummyFunction' );

        $dummyClassMock->expects($this->once())
             ->method( 'yetAnotherDummyFunction' );

        $dummyClassMock->dummyFunction();
   }
}

      

        
        
        
      

    

Now I noticed that if I mock the Dummy class in this way, the result is

The wait error for the method name is anotherDummyFunction when called 1 time (s). The method had to be called 1 time, in fact it was called 0 times.

But if I set the Mock Object this way

$dummyClassMock = $this->getMockBuilder('Dummy')
                     ->setMethods( array( 'anotherDummyFunction' ) )
                     ->getMock();

      

        
        
        
      

    

test pass. Finally, if I set the mock using setMethods (null), the test fails again

It seems that I can pass an array with only one element, the method I want to check if called. But I saw here: https://jtreminio.com/2013/03/unit-testing-tutorial-part-5-mock-methods-and-overriding-constructors/ that setMethods is used to inject the return value of the passed method, so have this would not have an impact on the call itself unless I put dummyFunction in setMethods (in which case the function will return null without calling the other two methods, and thus yes, the test should fail)

Did I do something wrong? I've seen code snippets where there are multiple methods in the setMethods () method ... Why does the test fail if I put these methods in setMethods?

thank