wip: code formatting nits continued

test/invert.spec.js

@@ -0,0 +1,21 @@
+import invert from '../src/invert';
+
+describe('invert', () => {
+    it('should invert an object', () => {
+        const object = { a: 1, b: 2 };
+        const actual = invert(object);
+
+        expect(actual).toEqual({ 1: 'a', 2: 'b' });
+        expect(invert(actual)).toEqual({ a: '1', b: '2' });
+    });
+
+    it('should work with values that shadow keys on `Object.prototype`', () => {
+        const object = { a: 'hasOwnProperty', b: 'constructor' };
+        expect(invert(object)).toEqual({ hasOwnProperty: 'a', constructor: 'b' });
+    });
+
+    it('should work with an object that has a `length` property', () => {
+        const object = { 0: 'a', 1: 'b', length: 2 };
+        expect(invert(object)).toEqual({ a: '0', b: '1', 2: 'length' });
+    });
+});