public void ReturnsTrue()
            {
                var sut = new SignatureParsingSuccess(new Signature {
                    String = "abc"
                });

                sut.IsSuccess.Should().BeTrue();
            }
            public void AssignsSignature()
            {
                var signature = new Signature {
                    String = "abc"
                };

                var sut = new SignatureParsingSuccess(signature);

                sut.Signature.Should().Be(signature);
            }