TypeError：无法读取未定义的属性“相等” [英] TypeError: Cannot read property 'equal' of undefined

问题描述

我正在尝试使用 enzyme 来断言DOM节点。我的组件看起来像

I am trying to use enzyme to assert DOM nodes. My Component looks like

import React, {Component} from 'react';
import TransactionListRow from './TransactionListRow';
import {Table, TableBody, TableHeader, TableHeaderColumn, TableRow} from 'material-ui/Table';

export default class TransactionList extends Component {
  render() {
    const { transactions } = this.props;

    return (
      <Table>
        <TableHeader displaySelectAll={false}>
          <TableRow>
            <TableHeaderColumn>Name</TableHeaderColumn>
            <TableHeaderColumn>Amount</TableHeaderColumn>
            <TableHeaderColumn>Transaction</TableHeaderColumn>
            <TableHeaderColumn>Category</TableHeaderColumn>
          </TableRow>
        </TableHeader>
        <TableBody>
          {transactions.map(transaction =>
            <TransactionListRow key={transaction.id} transaction={transaction}/>
          )}
        </TableBody>
      </Table>
    );
  }
};

我的测试看起来像

import expect from 'expect';
import React from 'react';
import {mount} from 'enzyme';
import TransactionList from '../TransactionList';
import {TableHeaderColumn} from 'material-ui/Table';
import getMuiTheme from 'material-ui/styles/getMuiTheme';

describe("<TransactionList />", () => {
  const mountWithContext = (node) => mount(node, {
    context: {
      muiTheme: getMuiTheme(),
    },
    childContextTypes: {
      muiTheme: React.PropTypes.object.isRequired,
    }
  });


  it('renders five <TableHeaderColumn /> components', () => {
    const wrapper = mountWithContext(<TransactionList transactions={[]}/>)

    console.log(wrapper.html());
    // expect(wrapper.find('thead').length).toBe(1);
    expect(wrapper.contains(<TableHeaderColumn>Name</TableHeaderColumn>)).to.equal(true)
  });
});

当我运行时，我得到

  ● <TransactionList /> › renders five <TableHeaderColumn /> components

    TypeError: Cannot read property 'equal' of undefined

      at Object.<anonymous> (src/components/transactions/__tests__/TransactionList.test.js:24:250)
      at process._tickCallback (internal/process/next_tick.js:103:7)

根据酶 docs ，

.contains（）期望一个ReactElement，而不是选择器（像许多其他
方法一样）。确保在调用它时使用ReactElement或JSX表达式调用
。

.contains() expects a ReactElement, not a selector (like many other methods). Make sure that when you are calling it you are calling it with a ReactElement or a JSX expression.

我是什么做错了？

谢谢

更新

我从'expect 中删除​​导入期望并将其作为

UPDATE
I removed the import expect from 'expect and ran it as

import React from 'react';
import {mount} from 'enzyme';
import TransactionList from '../TransactionList';
import TableHeaderColumn from 'material-ui/Table';
import getMuiTheme from 'material-ui/styles/getMuiTheme';

describe("<TransactionList />", () => {
  const mountWithContext = (node) => mount(node, {
    context: {
      muiTheme: getMuiTheme(),
    },
    childContextTypes: {
      muiTheme: React.PropTypes.object.isRequired,
    }
  });


  it('renders five <TableHeaderColumn /> components', () => {
    const wrapper = mountWithContext(<TransactionList transactions={[]}/>)

    // console.log(wrapper.html());
    expect(wrapper.find('thead').length).toBe(1);
    expect(wrapper.find('td').length).toBe(0);

    // this is not working
    expect(wrapper.contains(<TableHeaderColumn/>)).toEqual(true);
  });
});

现在失败

 FAIL  src/components/transactions/__tests__/TransactionList.test.js
  ● <TransactionList /> › renders five <TableHeaderColumn /> components

    expect(received).toEqual(expected)

    Expected value to equal:
      true
    Received:
      false

      at Object.<anonymous> (src/components/transactions/__tests__/TransactionList.test.js:26:164)

和

expect(wrapper.contains(<TableHeaderColumn/>)).to.equal(true);

我得到

      Warning: Unknown props `onMouseEnter`, `onMouseLeave`, `onClick` on <th> tag. Remove these props from the element. 
 FAIL  src/components/transactions/__tests__/TransactionList.test.js
  ● <TransactionList /> › renders five <TableHeaderColumn /> components

    TypeError: Cannot read property 'equal' of undefined

      at Object.<anonymous> (src/components/transactions/__tests__/TransactionList.test.js:26:166)
      at process._tickCallback (internal/process/next_tick.js:103:7)

我仍然无法断言 ReactElement

推荐答案

这不是 Enzyme 问题。

expect（...）。到是 undefined 因为你已经安装了 expect.js 你正在使用 chai 语法。

expect(...).to is undefined because you have installed expect.js and you are using chai syntax.

此

expect(wrapper.contains(<TableHeaderColumn>Name</TableHeaderColumn>)).to.equal(true)

应

expect(wrapper.contains(<TableHeaderColumn>Name</TableHeaderColumn>)).toEqual(true)

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