我想测试我的react登录组件,但尚未调用模拟功能:
登录:
export default class LoginPage extends PureComponent {
static propTypes = {
login: PropTypes.func.isRequired,
history: PropTypes.shape({
replace: PropTypes.func.isRequired,
}).isRequired,
};
onSubmit = (e) => {
this.props.login(this.state.username, this.state.password)
.then(() => {
this.props.history.replace('/');
});
};
render() {
return (
<form onSubmit={this.onSubmit}>
...
</form>
);
}
}
我使用jest
enzyme
测试以下测试:
const props = {
login: jest.fn(() => Promise.resolve('success')),
history: {
replace: jest.fn()
},
};
const wrapper = mount(<LoginPage {...props}/>);
const form = wrapper.find(Form);
const inputs = form.find('input');
const username = inputs.at(0);
const password = inputs.at(1);
username.simulate('change', {target: {value: 'Changed'}});
password.simulate('change', {target: {value: 'Changed'}});
form.simulate('submit');
expect(props.login).toBeDefined();
expect(props.history.replace).toBeDefined();
// this is success
expect(props.login).toBeCalled();
// this is failure
expect(props.history.replace).toBeCalled();
i模拟两个功能,history.replace
应由login
调用,login
被模拟为Promise函数。
expect(props.login).toBeCalled()
测试成功。
但是expect(props.history.replace).toBeCalled()
测试失败。
i log props.history.replace.mock
,它输出{ calls: [], instances: [] }
。
您需要告知Jest您使用的承诺,否则它将不等待,因此在承诺解决之前,测试已经结束。这是用于测试异步内容的文档。您的测试需要成为async
功能。该承诺需要存储在一个变量中,该变量可以在提交表格提交后与await
一起使用:
it('does something', async () => {
const promise = Promise.resolve('success')
const props = {
login: jest.fn(() => promise),
history: {
replace: jest.fn()
},
};
const wrapper = mount(<LoginPage {...props}/>);
const form = wrapper.find(Form);
const inputs = form.find('input');
const username = inputs.at(0);
const password = inputs.at(1);
username.simulate('change', {target: {value: 'Changed'}});
password.simulate('change', {target: {value: 'Changed'}});
form.simulate('submit');
await promise;
expect(props.login).toBeDefined();
expect(props.history.replace).toBeDefined();
// this is success
expect(props.login).toBeCalled();
// this is failure
expect(props.history.replace).toBeCalled();
})