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It looks as though your it() expectations are nested within your beforeEach block. They should be peers of beforeEach, or directly under the nearest describe.

Found the issue. It was, of course, a configuration issue. There is a property in the angular.json file to specify a custom karmaConfig path.

I am not sure how it happened, but it had an incorrect path of src/karma.config.js Karma still ran when I ran ng test because (as per Angualr.io)

The karma.conf.js file is a partial Karma configuration file. The CLI constructs the full runtime configuration in memory, based on application structure specified in the angular.json file, supplemented by karma.conf.js.

The error I was getting about my customLoader being missing is technically correct since Karma was not loading my config. So if the Karma config file specified in the angular.json file is not found, the CLI continues and makes a "default" config for Karma to run.

My two cents: there should be some error outputted to the console that the specified karma config could not be found, but alas, there is not. Check your paths people!

I have solved this issue by having a listener to the karma infrastructure errors by having the below code in my karma.conf.js file

The trick for me was to remove 'coverage' from the reporters. It should just be:

This was a problem with my computer resources. Since the source map was active and put a lot of load on my computer. I disabled it with the following command to run the test:

It looks like the cause of the function not being empty is your coverage tracker, thus the "cov" part of cov_10clr7afd6.f[9]++. This is one of the problems with inspecting any code that has gone through compilation steps, it might not be what you would reasonably expect.

Here's some options:

When you test a *.vue file, the directory of this file diplayed in the corevage list.

EDIT : or add

jest-preset-angular uses its own Reflection package, which only works with Angular Decorators. A soon as you want to use another package with decorators, you should include a function-complete Reflect-Metadata package, such as provided by the package core-js.

To do so, add the Reflect-Metadata-Polyfills before importing jest-preset-angular to your setupFilesAfterEnv-file (this file is usually called src/setupJest.ts or src/test-setup.ts, here for core-js@3):

The Test Bed is usually called and components/fixtures are initialized before each test and not within each test (usually).