Allows injecting dependencies in beforeEach() and it(). Note: this function (imported from the @angular/core/testing package) can only be used to inject dependencies in tests. To inject dependencies in your application code, use the inject function from the @angular/core package instead.

Example:

beforeEach(inject([Dependency, AClass], (dep, object) => {
  // some code that uses `dep` and `object`
  // ...
}));

it('...', inject([AClass], (object) => {
  object.doSomething();
  expect(...);
})