public void ShouldReturnNullWhenNullIsGivenToEncode()
 {
     var base64Converter = new Base64Converter();
      string result = base64Converter.Encode(null);
      Assert.That(result, Is.EqualTo(null));
 }
 public void ShouldBase64EncodeARandomString()
 {
     var base64Converter = new Base64Converter();
      string result = base64Converter.Encode("Hello Base64");
      Assert.That(result, Is.EqualTo("SGVsbG8gQmFzZTY0"));
 }