public InterpreterTests()
{
string resistorBand1 = "BR,RD,RD,RD";
string resistorBand2 = "BR,RD,BK";
circuit.AddResistor(resistorBand1);
circuit.AddResistor(resistorBand2);
list.Add(new SeriesExpression());
list.Add(new ParallelExpression());
}