what does php --version says ? And are you running this with artisan tinker or separately with boris or some other REPL ?

Also paste in the part of codes throwing error.

PHP 5.5.11-3+deb.sury.org~precise+1 (cli) (built: Apr 23 2014 12:28:12) Copyright (c) 1997-2014 The PHP Group Zend Engine v2.5.0, Copyright (c) 1998-2014 Zend Technologies with Zend OPcache v7.0.4-dev, Copyright (c) 1999-2014, by Zend Technologies

Class A {
public doSearch($parameters){
    $response = Twitter::getSearch($parameters);
}

in PHPUnit test:

TwitterFacade::shouldReceive('getSearch)');
$this->object->getSearch($parameters);

When I use:

Thujohn\Twitter\TwitterFacade::shouldReceive('getSearch)');
$tweets = $this->object->getSearch($parameters);

I got:

1) ATest::testGetSearch
ErrorException: Non-static method Thujohn\Twitter\TwitterFacade::getSearch() should not be called statically, assuming $this from incompatible context

Try removing the ")" from the end of 'getSearch)'.