Update eslint rules

test/.eslintrc.json

@@ -0,0 +1,16 @@
+{
+  "extends": "../.eslintrc.json",
+
+  "rules": {
+    "no-shadow": 1
+  },
+
+  "globals": {
+    "expect": true,
+    "sinon": true
+  },
+
+  "env": {
+    "mocha": true
+  }
+}