Bug in Test if a Value is an Array

Hello, I found a bug in this challenge,
look at the screen shot below:

no description

What bug?

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There is no description about isArray and isNotArray what do i have to do?

Referring to the documentation is often helpful, and fortunately, chai has a user-friendly one. See it here: https://www.chaijs.com/api/assert/#method_isarray

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