import {inject, TestBed} from '@angular/core/testing';

import {ConverterRegistryService} from './converter-registry.service';
import {NativeLibraryWrapperService} from './native-library-wrapper.service';
import {Converter} from './converter/converter';
import {Base64Decoder} from './converter/base64-decoder';
import createSpyObj = jasmine.createSpyObj;

describe('ConverterRegistryService', () => {
  beforeEach(() => {
    TestBed.configureTestingModule({
      providers: [
        ConverterRegistryService,
        {provide: NativeLibraryWrapperService, useValue: createSpyObj(['punycode', 'quotedPrintable', 'utf8'])}
      ]
    });
  });

  it('should be created', inject([ConverterRegistryService], (service: ConverterRegistryService) => {
    expect(service).toBeTruthy();
  }));

  it('should register converters upon creation', inject([ConverterRegistryService], (service: ConverterRegistryService) => {
    expect(service.getAllConverters()).toBeTruthy();
    expect(service.getAllConverters().length).toBeGreaterThan(0);
  }));

  it('must not allow the same converter ID to be regisgered more than once',
    inject([ConverterRegistryService], (service: ConverterRegistryService) => {
      // arrange
      const duplicateConverter: Converter = new Base64Decoder();
      const duplicateConverterId = duplicateConverter.getId();
      expect(() => {
        // act
        (service as any).registerConverter(duplicateConverter);
      })
      // assert
        .toThrowError(`Converter-ID ${duplicateConverterId} is already registered!`);
    }));
});