Forward compatibility with PHPUnit 6#85

Merged

jsor merged 2 commits intoreactphp:masterfrom

carusogabriel:phpunit

Dec 1, 2017

Commits on Nov 18, 2017

Use PHPUnit\Framework\TestCase instead of PHPUnit_Framework_TestCase
carusogabriel
committed

Commits on Nov 20, 2017

Added setExpectedException method for compatibility
carusogabriel
committed