Doesn't understand logic of tests

Hello I was confused because of it’s chai’s assertions:
My code:aab45767-dce0-4327-8439-83b292c52f4f
In Chai’s documentation I see:
The following are provided as chainable getters to improve the readability of your assertions.


So i was thinking i can skip .to chain without loosing anythig, why it doesn’t work without this chain?

@borys.fursov The Chai assertion interface exposed within the testing sandbox requires all assertion chains to begin with .to.