ProxyTrait::stub() actually return $this.

[Giuffre]

Is not a good design if we want to compose functionality for Proxies (ProxyInterface) because we can't warranted the return type.

Refactor of this part or include this method in an abstract proxy.

    /**
     * @param array $namesWithValues
     * @return ProxyInterface
     *
     * @throws InvalidArgumentException
     * @throws MockNotCreatedException
     */
    public function stub(array $namesWithValues): ProxyInterface
    {
        //...

        /** @var $this ProxyInterface */
        $this->__moka_mockingStrategy->decorate($this->__moka_mock, $namesWithValues);

        return $this;
    }

[xzhayon]

I'm afraid an abstract cannot be used, as it would have to extend the generated mock class. That's why we opted for the trait.