import ServersImporter from '../../../src/servers/services/ServersImporter';

describe('ServersImporter', () => {
  const servers = [{ name: 'foo' }, { name: 'bar' }];
  const csvjsonMock = {
    toObject: jest.fn(() => servers),
  };
  const importer = new ServersImporter(csvjsonMock);

  beforeEach(() => csvjsonMock.toObject.mockClear());

  describe('importServersFromFile', () => {
    it('rejects with error if no file was provided', async () => {
      try {
        await importer.importServersFromFile();
      } catch (e) {
        expect(e).toEqual('No file provided or file is not a CSV');
      }
    });

    it('rejects with error if provided file is not a CSV', async () => {
      try {
        await importer.importServersFromFile({ type: 'text/html' });
      } catch (e) {
        expect(e).toEqual('No file provided or file is not a CSV');
      }
    });

    it('reads file when a CSV is provided', async () => {
      const readAsText = jest.fn(() => '');

      global.FileReader = class FileReader {
        constructor() {
          this.readAsText = readAsText;
          this.addEventListener = (eventName, listener) =>
            listener({ target: { result: '' } });
        }
      };

      await importer.importServersFromFile({ type: 'text/csv' });

      expect(readAsText).toHaveBeenCalledTimes(1);
      expect(csvjsonMock.toObject).toHaveBeenCalledTimes(1);
    });
  });
});