React-native-testing-library: check if a matching node doesn't exist

[iconicsammy]

Hi,

Perhaps this is found somewhere else but I couldn't find one. My scenario is straight forward:

expect(UNSAFE_getByType(ComponentName)).toEqual(undefined)

I want to make sure the ComponentName doesn't exist. The above fails because ComponentName doesn't exist indeed (no instance with node exists error) but it should pass. Currently I am doing it in a trycatch but I was wondering if there is a way to do it?

[thymikee]

You can use toThrow Jest matcher:

expect(() => UNSAFE_getByType(ComponentName)).toThrow("no instances found")

or use queryByType and assert .toEqual(null)