With the code:

<pre>
/* @noinspection MagicMethodsValidityInspection /
public function phpunit_getInvocationMocker(): InvocationMocker
{
if ($this->__phpunit_invocationMocker === null) {
$this->phpunit_invocationMocker = new InvocationMocker(
static::$__phpunit_configurableMethods,
$this->__phpunit_returnValueGeneration
);
}

    return $this->__phpunit_invocationMocker;
}

</pre>

The <code>static::$__phpunit_configurableMethods</code> is not covered, because FETCH_STATIC_PROP_FUNC_ARG is not overloaded:

<pre>
68 5 > EXT_STMT
6 NEW $0 :-21
7 EXT_FCALL_BEGIN
8 CHECK_FUNC_ARG
69 9 FETCH_STATIC_PROP_FUNC_ARG unknown $1 '__phpunit_configurableMethods'
10 SEND_FUNC_ARG $1
11 CHECK_FUNC_ARG
</pre>

<pre>
derick@singlemalt:~/dev/php/derickr-xdebug$ grep -r FETCH_OBJ_FUNC_ARG
xdebug.c: XDEBUG_SET_OPCODE_OVERRIDE_COMMON(ZEND_FETCH_OBJ_FUNC_ARG);
xdebug.c: zend_set_user_opcode_handler(ZEND_FETCH_OBJ_FUNC_ARG, NULL);
derick@singlemalt:~/dev/php/derickr-xdebug$ grep -r FETCH_STATIC_PROP_FUNC_ARG
derick@singlemalt:~/dev/php/derickr-xdebug$

</pre>