jest-zone-patch | Enables Jest functions to be run within Zone.js context | DNS library

I am trying to test the contents of my pages now that I have converted them to Lazy Loading with Ionic 3. However, I constantly get compile errors in the spec.ts file, as I am not sure how to build the individual test bed parts for tab pages in the application. I am trying to simply test a standard simple page generated with the ionic generate page command.

about.module.ts

I have a failing test that I'm not sure how to fix. The error messages I'm getting from Jest appear to be contradictory, and the problem relates to the behavior of two Angular HttpTestingController methods: verify() and expectOne().

The test in question, in the context of its file:

I need to unit test a component method that does not return a Promise, but internally calls a method in a service that does, and so unit test execution returns immediately to the 'it' block. This results in objects that I am supposed to look at for certain values to not yet be assigned. Angular documentation suggests that I use a Spy object. This seems to be exactly what I need. Unfortunately, even the most basic of unit tests won't let me create a Spy object.

The following code...