public void MultipleVariablesCanBeUnsetAtTheSameTime()
{
var count = Variable.Variables.Count;
var unsetVariable = new UnsetVariable();
var calculate = new Calculate();
Assert.AreEqual("x = 2", _inputHandler.HandleInput("set x = 2"));
Assert.AreEqual("y = 4", _inputHandler.HandleInput("set y = 4"));
Assert.AreEqual("z = 6", _inputHandler.HandleInput("set z = 6"));
Assert.AreEqual(count + 3, Variable.Variables.Count);
Assert.AreEqual("Variable x unset.", _inputHandler.HandleInput("unset x"));
Assert.Throws<CalculatorException>(() => unsetVariable.HandleInput("unset x"));
Assert.AreEqual(count + 2, Variable.Variables.Count);
Assert.AreEqual("Variables z, y unset.", _inputHandler.HandleInput("unset z, y"));
Assert.AreEqual(count, Variable.Variables.Count);
Assert.Throws<CalculatorException>(() => unsetVariable.HandleInput("unset y, z"));
Assert.Throws<CalculatorException>(() => unsetVariable.HandleInput("unset z"));
Assert.Throws<CalculatorException>(() => calculate.HandleInput("x"));
Assert.Throws<CalculatorException>(() => calculate.HandleInput("y"));
Assert.Throws<CalculatorException>(() => calculate.HandleInput("z"));
Assert.AreEqual("y = 4", _inputHandler.HandleInput("set y = 4"));
Assert.AreEqual("z = 6", _inputHandler.HandleInput("set z = 6"));
Assert.AreEqual("Variables y, z unset.", _inputHandler.HandleInput("unset y; z"));
}
/// <summary>
/// Handles the input.
/// </summary>
/// <param name="initialInput">The initial input.</param>
/// <returns></returns>
public override string HandleInput(string initialInput)
{
var calculate = new Calculate();
var index = 0;
if ( StringParse.StringStartsWith(initialInput, Command) )
{
index = Command.Length;
}
try
{
calculate.HandleInput(initialInput.Substring(index));
}
catch (CalculatorException e)
{
e.ErrorIndex += index;
throw e;
}
return Calculate.DoubleToFraction(Variable.ANS.Value);
}
public void VariablesCanBeUnset()
{
var count = Variable.Variables.Count;
Assert.AreEqual("x = 2", _inputHandler.HandleInput("set x = 2"));
Assert.AreEqual(count + 1, Variable.Variables.Count);
Assert.AreEqual("Variable x unset.", _inputHandler.HandleInput("unset x"));
Assert.AreEqual(count, Variable.Variables.Count);
var unsetVariable = new UnsetVariable();
var calculate = new Calculate();
Assert.Throws<CalculatorException>(() => unsetVariable.HandleInput("unset x"));
Assert.Throws<CalculatorException>(() => calculate.HandleInput("x"));
}