Codacy style changes for test files

test/mapKeys/mapKeys.js

@@ -1,6 +1,7 @@
 const mapKeys = (obj, fn) =>
-Object.keys(obj).reduce((acc, k) => {
-acc[fn(obj[k], k, obj)] = obj[k];
-return acc;
-}, {});
+  Object.keys(obj).reduce((acc, k) => {
+    acc[fn(obj[k], k, obj)] = obj[k];
+    return acc;
+  }, {});
+
 module.exports = mapKeys;