php - PHPUnit how to test a specific method with specific parameter with specific answer for more than one call

I have tried testing multiple parameters for a specific method, and get different answers by the same mock for different parameters.

This is what I've done so far:

$mock = $this->getMockBuilder('MyClass')->disableOriginalConstructor()->getMock();

$mock->expects($this->any())
            ->method('myMethod')
            ->with($this->equalTo('param1'))
            ->will($this->returnValue('test1'));
$mock->expects($this->any())
            ->method('myMethod')
            ->with($this->equalTo('param2'))
            ->will($this->returnValue('test2'));
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When I call$myClass->myMethod('param1') all is well and I get the'test1'

However, here's the problem:

When I call$myClass->myMethod('param2') I get an error

Failed asserting that two strings are equal. --- Expected +++ Actual @@ @@ -'param1' +'param2'

A solution I have found is to just create a new mock for each call.

$mock1 = $this->getMockBuilder('MyClass')->disableOriginalConstructor()->getMock();        
$mock1->expects($this->any())
    ->method('myMethod')
    ->with($this->equalTo('param1'))
    ->will($this->returnValue('test1'));

$mock2 = $this->getMockBuilder('MyClass')->disableOriginalConstructor()->getMock();
$mock2->expects($this->any())
    ->method('myMethod')
    ->with($this->equalTo('param2'))
    ->will($this->returnValue('test2'));
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I do not know though why is this needed, perhaps I am using it wrong.

So the question remains:

How do I mock the same class, with a specific method, for different parameters and get different return values?