Calling static method on a mock object results in a warning without message

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When I call a static method on a mock object I get a warning from PHPUnit which does not tell me why.

Consider the following example:

class FooTest extends \PHPUnit_Framework_TestCase
{
    public function testFoo()
    {
        $example = $this->createMock(ExampleClass::class);
        $example->staticMethod();

        $this->assertTrue(false);
    }
}

class ExampleClass
{
    public static function staticMethod()
    {
    }
}

The test results in a warning when the static method is called. The assertion afterwards is not executed, because the static method call produced an Exception.

I know, that PHPUnit does not mock static methods, but a reasonable error (or warning) message would be good. It took me some time to figure out the reason why my test triggered the warning (because the static call was not made directly in the test case but somewhere deep in the code).