what is the equivalent of ng-test from angular in ionic 4?

everytime I try to run ng test in my ionic app, I get an error for every single ionic html item I have in the app... I am not sure how to do the unit testing then, I researched but didn't find any blogs very helpful, I am also not very experient in unit tests in general but I could do those in a regular Angular app.

what is the best way to make unit tests in a ionic 4 with angular 7 app?