import React from "react";
import ReactTestUtils from "react-addons-test-utils";

import MenuScreen from "src/components/MenuScreen/MenuScreen.js";

describe("MenuScreen", () => {

  it("should exist", () => {
    MenuScreen.should.exist;
  });

  it("should be react element", () => {
    ReactTestUtils.isElement(<MenuScreen />).should.be.ok;
  });

});

import React from "react";
import ReactTestUtils from "react-addons-test-utils";
import jsdom from "mocha-jsdom";

import MenuScreen from "src/components/MenuScreen/MenuScreen.js";
import Button from "src/components/Shared/Button.js";

import setCurrentScreenAction from "src/actions/ScreenActions.js";
import { GAME_SCREEN } from "src/actions/ScreenActions.js";

import {setGameModeAction} from "src/actions/GameActions.js";
import {VS_HUMAN, EASY, MEDIUM, HARD} from "src/reducers/Game.js";

describe("MenuScreen", () => {

  jsdom();

  it("should exist", () => {
    MenuScreen.should.exist;
  });

  it("should be react element", () => {
    ReactTestUtils.isElement(<MenuScreen />).should.be.ok;
  });

  describe("Buttons", () => {

    let actions = [],
        dispatch = (action) => actions.push(action),
        gameModes = [VS_HUMAN, EASY, MEDIUM, HARD];

    function testButtonNumber(i) {
      it("Button should dispatch proper actions on click", () => {
        const menuScreen = ReactTestUtils.renderIntoDocument(
          <MenuScreen dispatch={dispatch} />
        );
        var buttons = ReactTestUtils.scryRenderedComponentsWithType(
            menuScreen,
            Button
          );
        var node = ReactTestUtils
            .findRenderedDOMComponentWithTag(buttons[i], "button");

        ReactTestUtils.Simulate.click(node);

        actions[0].should.be.eql(setCurrentScreenAction(GAME_SCREEN));
        actions[1].should.be.eql(setGameModeAction(gameModes[i]));
        actions = [];
      });
    }

    for (let i = 0; i < 4; i++) {
      testButtonNumber(i);
    }

  });

});

Add tests for menu buttons
Add tests for menu buttons
