NG10/NS7 Test Service unit test

_src_tests_test.service.spec.ts

import { customNsTestBedAfterEach, customNsTestBedBeforeEach } from './setup';
import { Injectable } from '@angular/core';
import { TestBed } from '@angular/core/testing';

@Injectable({
  providedIn: 'root'
})

export class TestService {
  hello(): string {
    return 'hello';
  }
}


describe('Test Service', () => {
  let testService: TestService;
  beforeEach(customNsTestBedBeforeEach(
    [],
    [ TestService ],
  ));
  afterEach(() => customNsTestBedAfterEach());

  describe('Function Tests -', () => {
    beforeEach(() => {
      testService = TestBed.inject(TestService);
    });

    describe('hello()', () => {
      it('should return the string "hello"', () => {
        expect(testService.hello()).toEqual('hello');
      });
    });
  });
});