Prepare tests for react-parallel/event-loop

Author: WyriHaximus

composer.json

@@ -15,6 +15,7 @@
         "moneyphp/money": "^3.2.1",
         "ocramius/package-versions": "^1.4",
         "react-parallel/contracts": "^1.0",
+        "react-parallel/event-loop": "^1.0",
         "react/event-loop": "^1.1",
         "react/promise": "^2.7",
         "wyrihaximus/async-test-utilities": "^2.0.0-alpha2",