fix icon test coverage

components/icon/__tests__/index.test.js

@@ -47,6 +47,7 @@ describe('Icon', () => {
   it('should support config global two-tone primary color', () => {
     const colors = ReactIcon.getTwoToneColors();
     Icon.setTwoToneColor('#1890ff');
+    expect(Icon.getTwoToneColor()).toBe('#1890ff');
     const wrapper = render(
       <Icon type="check-circle" theme="twoTone" />
     );