wip: code formatting nits continued

test/isSymbol.spec.js

@@ -0,0 +1,39 @@
+import lodashStable from 'lodash';
+import { symbol, falsey, stubFalse, args, slice, realm } from './utils';
+import isSymbol from '../src/isSymbol';
+
+describe('isSymbol', () => {
+    it('should return `true` for symbols', () => {
+        if (Symbol) {
+            expect(isSymbol(symbol)).toBe(true);
+            expect(isSymbol(Object(symbol))).toBe(true);
+        }
+    });
+
+    it('should return `false` for non-symbols', () => {
+        const expected = lodashStable.map(falsey, stubFalse);
+
+        const actual = lodashStable.map(falsey, (value, index) =>
+            index ? isSymbol(value) : isSymbol(),
+        );
+
+        expect(actual).toEqual(expected);
+
+        expect(isSymbol(args)).toBe(false);
+        expect(isSymbol([1, 2, 3])).toBe(false);
+        expect(isSymbol(true)).toBe(false);
+        expect(isSymbol(new Date())).toBe(false);
+        expect(isSymbol(new Error())).toBe(false);
+        expect(isSymbol(slice)).toBe(false);
+        expect(isSymbol({ 0: 1, length: 1 })).toBe(false);
+        expect(isSymbol(1)).toBe(false);
+        expect(isSymbol(/x/)).toBe(false);
+        expect(isSymbol('a')).toBe(false);
+    });
+
+    it('should work with symbols from another realm', () => {
+        if (Symbol && realm.symbol) {
+            expect(isSymbol(realm.symbol)).toBe(true);
+        }
+    });
+});