Allow reseting counter for isomorphic apps

Author: danez

src/components/Tabs.js

@@ -1,7 +1,7 @@
 import PropTypes from 'prop-types';
 import React, { cloneElement, Component } from 'react';
 import cx from 'classnames';
-import uuid from '../helpers/uuid';
+import uuid, { reset } from '../helpers/uuid';
 import childrenPropType from '../helpers/childrenPropType';
 import Tab from './Tab';
 
@@ -43,6 +43,10 @@ export default class Tabs extends Component {
     this.state = Tabs.copyPropsToState(this.props, this.state);
   }
 
+  static resetIDCounter() {
+    reset();
+  }
+
   getChildContext() {
     return {
       forceRenderTabPanel: this.props.forceRenderTabPanel,

src/components/__tests__/Tabs-test.js

@@ -109,6 +109,23 @@ describe('<Tabs />', () => {
         expect(panel.prop('id')).toBe(tab.prop('panelId'));
       }
     });
+
+    it('should reset ids correctly', () => {
+      mount(createTabs());
+
+      Tabs.resetIDCounter();
+
+      const wrapper = mount(createTabs());
+      const tablist = wrapper.childAt(0);
+
+      for (let i = 0, j = 0, l = wrapper.instance().getTabsCount(); i < l; i++, j += 2) {
+        const tab = tablist.childAt(i);
+        const panel = wrapper.childAt(i + 1);
+
+        expect(tab.prop('id')).toBe(`react-tabs-${j}`);
+        expect(panel.prop('id')).toBe(`react-tabs-${j + 1}`);
+      }
+    });
   });
 
   describe('interaction', () => {

src/helpers/uuid.js

@@ -1,5 +1,9 @@
 // Get a universally unique identifier
 let count = 0;
-module.exports = function uuid() {
+export default function uuid() {
   return `react-tabs-${count++}`;
-};
+}
+
+export function reset() {
+  count = 0;
+}