PHPUnit willReturnMap always returns null

Question

I have a unit test which uses the following mocked class

$this->stubHandle = $this->getMockBuilder(Handle::class)->disableOriginalConstructor()->getMock();

When I run

$key = new Key($this->stubHandle);
$this->stubHandle->method('__call')->will($this->returnCallback('var_dump'));
$key->nonExistingMethod('element0', 'element1', []);

it outputs

string(17) "nonExistingMethod"

and

array(3) {
  [0] =>
  string(8) "element0"
  [1] =>
  string(8) "element1"
  [2] =>
  array(0) {
  }
}

which I think it means the first argument of method __call is a string and the second argument is an array. No more arguments passed.

When I mock the return value of method __call like

$this->stubHandle->method('__call')->willReturn(1);

The return value is always 1 as expected.

When I mock the return value of method __call like

$this->stubHandle->method('__call')->willReturnMap(
    [
        ['argument1', null, 'returnValue'],
    ]
);

I expect the return value to be 'returnValue' when the first argument of method __call is 'argument1' while the seconds argument doesn't care. If the first argument isn't 'argument1', I expect a return value of null.

Are these expectations correct?

No matter what I try, the return value is always null when I mock this value with method willReturnMap.

If my expectations are wrong, please lead me to a way to accomplish my goals to mock the return value, depending on the first argument (only) and also explain to me how to apply willReturnMap.

DigiLive · Accepted Answer · 2020-05-29 08:35:18Z

It seems my search for method willReturnMap mislead me a bit.
I was under the assumption using null in the map, it would act as a "don't care", but it literally means null.

$this->stubHandle->method('__call')->willReturnMap(
    [
        ['nonExistingMethod', null, 'returnValue'],
    ]
);

means the arguments of method __call must explicitly be 'nonExistingMethod' & null if you want the return value to be 'returnValue'. Any other argument-values will return null instead.
E.g. $key->nonExistingMethod(null);

For the map to return 'returnValue' in my example, it should have been:

$this->stubHandle->method('__call')->willReturnMap(
    [
        ['nonExistingMethod', ['element0', 'element1', []], 'returnValue'],
    ]
);
$key->nonExistingMethod('element0', 'element1', []);

In short... When using argument mapping, the values can't be a "don't Care".

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