public void ConversionTest()
{
RomanConverter converter = new RomanConverter();
Assert.Equal <double>(1945, converter.ConvertToDecimal("MCMXLIVI").Value);
Assert.Equal <double>(521, converter.ConvertToDecimal("DXXI").Value);
Assert.Equal <double>(992, converter.ConvertToDecimal("CMXCII").Value);
Assert.NotEqual <double>(6, converter.ConvertToDecimal("IV").Value);
}