wip: code formatting nits continued

test/shuffle.spec.js

@@ -0,0 +1,29 @@
+import lodashStable from 'lodash';
+import shuffle from '../src/shuffle';
+
+describe('shuffle', () => {
+    const array = [1, 2, 3];
+    const object = { a: 1, b: 2, c: 3 };
+
+    it('should return a new array', () => {
+        assert.notStrictEqual(shuffle(array), array);
+    });
+
+    it('should contain the same elements after a collection is shuffled', () => {
+        expect(shuffle(array).sort()).toEqual(array);
+        expect(shuffle(object).sort()).toEqual(array);
+    });
+
+    it('should shuffle small collections', () => {
+        const actual = lodashStable.times(1000, () => shuffle([1, 2]));
+
+        assert.deepStrictEqual(lodashStable.sortBy(lodashStable.uniqBy(actual, String), '0'), [
+            [1, 2],
+            [2, 1],
+        ]);
+    });
+
+    it('should treat number values for `collection` as empty', () => {
+        expect(shuffle(1)).toEqual([]);
+    });
+});