Test files linted

test/forEachRight/forEachRight.test.js

@@ -5,7 +5,7 @@ test('forEachRight is a Function', () => {
   expect(forEachRight).toBeInstanceOf(Function);
 });
 let output = '';
-forEachRight([1, 2, 3, 4], val => output+=val);
+forEachRight([1, 2, 3, 4], val => (output += val));
 test('Iterates over the array in reverse', () => {
   expect(output).toBe('4321');
 });