[Tests] shim Object.assign in tests so that babel-eslint works in older nodes.

Author: ljharb

package.json

@@ -8,7 +8,7 @@
     "coveralls": "cat ./reports/coverage/lcov.info | coveralls",
     "lint": "eslint ./",
     "test": "npm run lint && npm run unit-test",
-    "unit-test": "istanbul cover --dir reports/coverage node_modules/mocha/bin/_mocha tests/**/*.js -- --reporter dot"
+    "unit-test": "istanbul cover --dir reports/coverage node_modules/mocha/bin/_mocha tests/**/*.js -- --reporter dot --opts tests/mocha.opts"
   },
   "files": [
     "LICENSE",

tests/mocha.opts

@@ -0,0 +1 @@
+--require ./tests/setup

tests/setup.js

@@ -0,0 +1,3 @@
+'use strict';
+
+require('object.assign/shim')();