wrapper.find(y).at(x).exists() always returns true

[crymis]

Current behavior

expect(wrapper.find('DOESNOTEXIST').at(0).exists()).toBe(true);
^ always works

Expected behavior

expect(wrapper.find('DOESNOTEXIST').at(0).exists()).toBe(false);

Your environment

API

• shallow
• mount
• render

Version

library	version
Enzyme	^3.1.1
React	^16.0.0

Adapter

• enzyme-adapter-react-16 (^1.0.4)
• enzyme-adapter-react-15
• enzyme-adapter-react-15.4
• enzyme-adapter-react-14
• enzyme-adapter-react-13
• enzyme-adapter-react-helper
• others ( )

[ljharb]

We have explicit tests for this:

• https://github.com/airbnb/enzyme/blob/master/packages/enzyme-test-suite/test/ShallowWrapper-spec.jsx#L2810-L2818
• https://github.com/airbnb/enzyme/blob/master/packages/enzyme-test-suite/test/ReactWrapper-spec.jsx#L2826-L2832

Can you provide the code for whatever constructs wrapper, and also wrapper.find('DOESNOTEXIST').at(0).debug()?

[crymis]

Thanks for the answer.
The issue is related with the combination of the at and the exists methods.
I can provide a code example next week.

[KordonDev]

Hi
I have added a pull request, which adds a failing test in ShallowWrapper just after the one mentioned by you. Hope this helps for understanding.

The problem is in short form, that at(0) returns undefined, which will be a ShallowWrapper with 1 child, which is undefined. And exists only checks if the length is greater than 0.