TypeError: Kann die Eigenschaft 'equal' von undefined nicht lesen

Question

Ich versuche enzyme zu verwenden, um DOM-Knoten zu aktivieren. Meine Component sieht aus wie

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> 
    ); 
    } 
}; 

Mein test sieht aus wie

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) 
    }); 
}); 

Als ich das laufen, ich

● <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) 

erhalten Per Enzymedocs,

.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.

Was mache ich falsch?

Dank

UPDATE
entfernte ich die import expect from 'expect und lief als

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); 
    }); 
}); 

Es

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) 

und mit

nun versagt

ich

 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) 

Ich kann immer noch behaupten, nicht auf ReactElement

Answer 1

Das ist nicht ein Enzyme Problem.

expect(...).to ist undefined, weil Sie expect.js installiert haben und Sie chai Syntax verwenden.

dieser

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

sollte

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