wip: code formatting nits continued

test/isDate.spec.js

@@ -0,0 +1,36 @@
+import lodashStable from 'lodash';
+import { falsey, stubFalse, args, slice, symbol, realm } from './utils';
+import isDate from '../src/isDate';
+
+describe('isDate', () => {
+    it('should return `true` for dates', () => {
+        expect(isDate(new Date())).toBe(true);
+    });
+
+    it('should return `false` for non-dates', () => {
+        const expected = lodashStable.map(falsey, stubFalse);
+
+        const actual = lodashStable.map(falsey, (value, index) =>
+            index ? isDate(value) : isDate(),
+        );
+
+        expect(actual).toEqual(expected);
+
+        expect(isDate(args)).toBe(false);
+        expect(isDate([1, 2, 3])).toBe(false);
+        expect(isDate(true)).toBe(false);
+        expect(isDate(new Error())).toBe(false);
+        expect(isDate(slice)).toBe(false);
+        expect(isDate({ a: 1 })).toBe(false);
+        expect(isDate(1)).toBe(false);
+        expect(isDate(/x/)).toBe(false);
+        expect(isDate('a')).toBe(false);
+        expect(isDate(symbol)).toBe(false);
+    });
+
+    it('should work with a date object from another realm', () => {
+        if (realm.date) {
+            expect(isDate(realm.date)).toBe(true);
+        }
+    });
+});