Enzyme: simple .to.have not working

问题

From the docs something like this should be possible:

const wrapper = mount(<Foo name="foo" />);
expect(wrapper.find('.foo')).to.have.length(1);

But in my case this throws an error saying cannot read property have of undefined.

Using this works though:

expect(wrapper.find('.foo').length).toBe(1);

回答1:

Your expect function is probably expect-enzyme, which has camelCase methods (toBe()), .to.have is dot separated expect notation, as seen in these docs :

http://chaijs.com/api/bdd/

vs the expect-enzyme

https://github.com/PsychoLlama/expect-enzyme

So your "version" of expect has a different API, that's all.

来源：https://stackoverflow.com/questions/43813802/enzyme-simple-to-have-not-working