Angular 6 Unit Tests: An error was thrown in afterAll\nReferenceError: Can't find variable: $ thrown

Question

When running my unit tests, from time to time, even if they pass, at the end of all the tests running, I will get the following error.

On my Jenkins CI build running

Answer 1

Another thing which has helped me as well and solved a few of my problems was to add the statement to destroy the fixture after each test

  afterEach(() => {
    fixture.destroy();
  });