wip: code formatting nits continued

test/mean.spec.js

@@ -0,0 +1,17 @@
+import lodashStable from 'lodash';
+import { empties, stubNaN } from './utils';
+import mean from '../src/mean';
+
+describe('mean', () => {
+    it('should return the mean of an array of numbers', () => {
+        const array = [4, 2, 8, 6];
+        expect(mean(array)).toBe(5);
+    });
+
+    it('should return `NaN` when passing empty `array` values', () => {
+        const expected = lodashStable.map(empties, stubNaN);
+        const actual = lodashStable.map(empties, mean);
+
+        expect(actual).toEqual(expected);
+    });
+});