import {NativeLibraryWrapperService} from '../native-library-wrapper.service';
import {UTF8Decoder} from './utf8-decoder';
import createSpyObj = jasmine.createSpyObj;
import Spy = jasmine.Spy;

describe('UTF8Decoder', () => {
  let sut: UTF8Decoder;
  let nativeWrapperSpy: Partial<NativeLibraryWrapperService>;
  let decodeSpy: Spy;

  beforeEach(() => {
    nativeWrapperSpy = {utf8: createSpyObj(['decode'])};
    decodeSpy = nativeWrapperSpy.utf8.decode as Spy;
    sut = new UTF8Decoder((nativeWrapperSpy as NativeLibraryWrapperService));
  });

  it('should create an instance', () => {
    expect(sut).toBeTruthy();
  });

  it('should have the id "decodeutf8"', () => {
    expect(sut.getId()).toEqual('decodeutf8');
  });

  it('should call through to the native UTF-8 decoder', () => {
    const testInput = 'My input';
    const expectedOutput = 'It worked';
    decodeSpy.and.returnValue(expectedOutput);
    const result: string = sut.convert(testInput);
    expect(result).toEqual(expectedOutput);
    expect(decodeSpy).toHaveBeenCalledWith(testInput);
  });
});