describe(`Class Server:`, () =>
{
  describe(`shuld to throw error when passing:`, () =>
  {
    const badOptions = new Map();
    badOptions.set('', `string to its constructor`);
    badOptions.set(54646, `number to its constructor`);
    badOptions.set([], `array to its constructor`);
    badOptions.set({ providersPerServer: '' }, `options object with string for 'providersPerServer' to its constructor`);
    badOptions.set({ providersPerRequest: '' }, `options object with string for 'providersPerRequest' to its constructor`);

    badOptions.forEach( (message, option) =>
    {
      it( message, () =>
      {
        expect( () => new Server(option) ).toThrow();
      });
    });
  });

  describe(`shuld not to throw error when passing:`, () =>
  {
    const goodOptions = new Map();
    goodOptions.set(undefined, `any value to its constructor`);
    goodOptions.set({}, `empty object to its constructor`);
    goodOptions.set({ providersPerServer: [] }, `options object with empty array for 'providersPerServer' to its constructor`);
    goodOptions.set({ providersPerRequest: [] }, `options object with empty array for 'providersPerRequest' to its constructor`);

    goodOptions.forEach( (message, option) =>
    {
      it( message, () =>
      {
        expect( () => new Server(option) ).not.toThrow();
      });
    });

  });
});