public void WhenProvingACustomFormatShouldReturnValuesForThatFormat()
{
const string Teststring = "Andrei Ignat";
FormatableObject formatableObject = new FormatableObject
{
StringProperty = Teststring
};
string str = formatableObject.ToString("{StringProperty}");
str.Should().Be(Teststring, "because we are using a format string to get the value of the 'StringProperty' property");
}