public void GetPatientDetail_WhenPatientNotFound_Throws()
        {
            var sut = new PdsRetreiver(_fakePath);

            var ex = Assert.Throws <Exception>(() => sut.Retrieve("1111111111"));

            ex.Message.Should().Be("Nhs number not found");
        }
        public void GetPatientDetail_WhenCalledWithValidNhsNumber_ReturnsPatient()
        {
            var sut = new PdsRetreiver(_fakePath);

            var result = sut.Retrieve("1234567890");

            result.PatientName.Should().Be("Richard Grayson");
        }