React 测试库中的模拟路由器和玩笑

Question

我正在使用 React 测试库和 Jest 编写单元测试，并想检查我的 React 组件是否能够成功导航到下一页。

import { fireEvent, render, screen } from "@testing-library/react";
import React from 'react';
import { Provider } from 'react-redux';
import '@testing-library/jest-dom';
import appStore from '../../src/app/redux/store';
import { MemoryRouter, Route } from 'react-router-dom';
import { createMemoryHistory } from 'history';
import { Router } from 'react-router';

const setup = (initialEntries = []) => {
      let inMemHistory = createMemoryHistory({ initialEntries });
      const utils = render(
        <Router history={inMemHistory}>
          <Provider store={appStore}>
            <Component-1 />
          
          </Provider>
        </Router>
      );
 
      const saveButtonElem = screen.getByRole('button', { name: "Save and Continue" });
      return {
            saveButtonElem,
            inMemHistory,
            ...utils,
      }
};

测试：

test('should be able to navigate', async () => {
            const {
                 saveButtonElem,
                  inMemHistory,
                  getByText,
                  queryByText,
                  queryAllByText,
            } = setup(["/component_add"]);

        // Content of Test

            // Saving Config
            fireEvent.click(saveButtonElem);
            console.info("Current Path", inMemHistory.location.pathname);
// Got /component_add on console
// Expected /component_data  after clicking on save button
   
      })

我尝试在单击“保存”按钮后等待 5 秒，然后尝试打印路径，但结果是相同的。

Answer 1

假设您使用react-router，您可以使用内存路由器进行测试，这更容易且性能更高。在没有 IDE 支持的情况下打字时，我可能会出现拼写错误或语法错误。但它应该可以帮助您了解我的建议。

选项1：

it("should route to the expected page", () => {
  let mockHistory, mockLocation;
  render(
    <MemoryRouter initialEntries={["/currentUri"]}>
      <Component1 />
      // Dummy route that routes for all urls
      <Route
        path="*"
        render={({ history, location }) => {
          mockHistory= history;
          mockLocation= location;
          return null;
        }}
      />
    </MemoryRouter>
  );
  // navigate here on event
  userEvent.click(screen.getByRole('button', {name: /Save/}));
  expect(mockLocation.pathname).toBe("/expectedUri");
});

选项2：

import { createMemoryHistory } from 'history';
import { Router } from 'react-router';

const renderWithHistory = (initialEntries= [], Component) => {
  let inMemHistory = createMemoryHistory({
    initialEntries
  });
  return { 
      ...render(
        <Router history={inMemHistory}>
          <Component />
        </Router >
      ), history };
};

it("should route to the expected page", () => {
      const { history } = renderWithHistory(['/currentUri'], Component1);
      // navigate here on event
      userEvent.click(screen.getByRole('button', {name: /Save/}));
      expect(history.location.pathname).toBe("/expectedUri");
});