wip: code formatting nits continued

test/head.spec.js

@@ -0,0 +1,33 @@
+import lodashStable from 'lodash';
+import { arrayProto } from './utils';
+import head from '../src/head';
+import first from '../src/first';
+
+describe('head', () => {
+    const array = [1, 2, 3, 4];
+
+    it('should return the first element', () => {
+        expect(head(array)).toBe(1);
+    });
+
+    it('should return `undefined` when querying empty arrays', () => {
+        arrayProto[0] = 1;
+        expect(head([])).toBe(undefined);
+        arrayProto.length = 0;
+    });
+
+    it('should work as an iteratee for methods like `_.map`', () => {
+        const array = [
+            [1, 2, 3],
+            [4, 5, 6],
+            [7, 8, 9],
+        ];
+        const actual = lodashStable.map(array, head);
+
+        expect(actual).toEqual([1, 4, 7]);
+    });
+
+    it('should be aliased', () => {
+        expect(first).toBe(head);
+    });
+});