[英]How to test a React Component with Jest and Enzyme
使用酶示例jest Github項目,我可以克隆存儲庫並運行測試:
git clone https://github.com/lelandrichardson/enzyme-example-jest.git
cd enzyme-example-jest
yarn install
yarn test
但是,我沒有評論Foo-test.js
第11行:
expect(shallow(<Foo />).contains(<div className="foo" />)).toBe(true);
這樣文件現在看起來像這樣:
import React from 'react';
import { shallow, mount, render } from 'enzyme';
jest.dontMock('../Foo');
const Foo = require('../Foo');
describe("A suite", function() {
it("contains spec with an expectation", function() {
expect(true).toBe(true);
expect(shallow(<Foo />).contains(<div className="foo" />)).toBe(true);
});
it("contains spec with an expectation", function() {
//expect(shallow(<Foo />).is('.foo')).toBe(true);
});
it("contains spec with an expectation", function() {
//expect(mount(<Foo />).find('.foo').length).toBe(1);
});
});
當我運行測試時,我現在得到此錯誤:
yarn test v0.17.8
$ jest
Using Jest CLI v0.8.2, jasmine1
Running 1 test suite...Warning: React.createElement: type should not be null, undefined, boolean, or number. It should be a string (for DOM elements) or a ReactClass (for composite components).
FAIL src/__tests__/Foo-test.js (0.931s)
● A suite › it contains spec with an expectation
- TypeError: Component is not a function
at StatelessComponent.render (node_modules/react/lib/ReactCompositeComponent.js:44:10)
1 test failed, 2 tests passed (3 total in 1 test suite, run time 1.281s)
error Command failed with exit code 1.
如何成功運行此測試?
“ Foo”是用ES6類語法定義的,但在Foo-test.js
require
是必需的。 使用import
將修復它。
取代這個
const Foo = require('../ Foo');
有了這個
從'../Foo'導入Foo;
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