So I'm not sure if this is something that has changed over the Angular versions however when I ran ng test previously the tests used to fail if you had not imported certain components into the tests which you would need to do to pass the tests.
However now I notice that the tests still pass however the console is full of errors about elements not being known because they are components I have not imported into the tests. Eg:
As you can see tests still pass:
So I'm not sure if there is a specific setting or flag you should set to fail tests on these kinds of errors? Please let me know if I can provide more info.
I'm not really sure what to try.