/*
 * Copyright 2023 The Backstage Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import {
  coreServices,
  createServiceFactory,
} from '@backstage/backend-plugin-api';
import { createSpecializedBackend } from './createSpecializedBackend';

describe('createSpecializedBackend', () => {
  it('should create a backend without services', () => {
    expect(() =>
      createSpecializedBackend({ defaultServiceFactories: [] }),
    ).not.toThrow();
  });

  it('should throw on duplicate service implementations', () => {
    expect(() =>
      createSpecializedBackend({
        defaultServiceFactories: [
          createServiceFactory({
            service: coreServices.rootLifecycle,
            deps: {},
            factory: async () => ({
              addStartupHook: () => {},
              addBeforeShutdownHook: () => {},
              addShutdownHook: () => {},
            }),
          }),
          createServiceFactory({
            service: coreServices.rootLifecycle,
            deps: {},
            factory: async () => ({
              addStartupHook: () => {},
              addBeforeShutdownHook: () => {},
              addShutdownHook: () => {},
            }),
          }),
        ],
      }),
    ).toThrow(
      'Duplicate service implementations provided for core.rootLifecycle',
    );
  });

  it('should throw when providing a plugin metadata service implementation', () => {
    expect(() =>
      createSpecializedBackend({
        defaultServiceFactories: [
          createServiceFactory({
            service: coreServices.pluginMetadata,
            deps: {},
            factory: async () => ({ getId: () => 'test' }),
          }),
        ],
      }),
    ).toThrow('The core.pluginMetadata service cannot be overridden');
  });
});