public void CanBuildFnStatements()
{
repository.ReplayAll();
var eProcessor = new ExpressionProcessor();
PushFxOfPowX2(eProcessor);
var stackVal = eProcessor.Pop().ToString();
Assert.AreEqual("f(x) = ((x^2) * t)", stackVal);
repository.VerifyAll();
}
public void Input_4_5_x_add_eval_returns_9()
{
repository.ReplayAll();
var eProcessor = new ExpressionProcessor();
eProcessor.Push(new DoubleExpression(4));
eProcessor.Push(new DoubleExpression(5));
eProcessor.Push(new StringExpression("x"));
eProcessor.Eval(StackOpExpression.Add);
eProcessor.Eval((IFuncExpression)VIMExpression.FromString("eval"));
var expr = eProcessor.Pop();
Assert.IsInstanceOfType(typeof(INumericExpression), expr);
var numExpr = (INumericExpression)expr;
Assert.AreEqual(9, numExpr.dVal);
repository.VerifyAll();
}
public void InputEvalsLargeExpressions()
{
repository.ReplayAll();
var eProcessor = new ExpressionProcessor();
eProcessor.Push(new DoubleExpression(2));
eProcessor.Push(new StringExpression("x"));
eProcessor.Push(new DoubleExpression(3));
eProcessor.Eval(StackOpExpression.Power);
eProcessor.Push(new DoubleExpression(3));
eProcessor.Eval(StackOpExpression.Multiply);
eProcessor.Push(new DoubleExpression(5));
eProcessor.Eval(StackOpExpression.Add);
eProcessor.Eval((IFuncExpression)VIMExpression.FromString("eval"));
var expr = eProcessor.Pop();
var numExpr = (INumericExpression) expr;
Assert.AreEqual(29, numExpr.dVal);
repository.VerifyAll();
}
public void Input_x_2_pow_t_mul_1_evals_to_4_when_t_is_4()
{
repository.ReplayAll();
var eProcessor = new ExpressionProcessor();
eProcessor.Push(new DoubleExpression(4));
eProcessor.Push(new StringExpression("t"));
eProcessor.Eval((IFuncExpression)VIMExpression.FromString("sto"));
eProcessor.Push(new DoubleExpression(2));
PushFxOfPowX2(eProcessor);
eProcessor.Eval((IFuncExpression)VIMExpression.FromString("eval"));
//might need some sort of context eval
var stackVal = eProcessor.Pop().ToString();
Assert.AreEqual("16", stackVal);
repository.VerifyAll();
}
public void ProperlyHandlesMultipleInstancesOfOneVariable()
{
repository.ReplayAll();
var eProcessor = new ExpressionProcessor();
eProcessor.Push(new DoubleExpression(2));
eProcessor.Push(new StringExpression("x"));
eProcessor.Push(new DoubleExpression(3));
eProcessor.Eval(StackOpExpression.Power);
eProcessor.Push(new StringExpression("x"));
eProcessor.Push(new DoubleExpression(2));
eProcessor.Eval(StackOpExpression.Power);
eProcessor.Eval(StackOpExpression.Add);
eProcessor.Eval((IFuncExpression)VIMExpression.FromString("eval"));
var expr = eProcessor.Pop();
var numExpr = (INumericExpression) expr;
Assert.AreEqual(12, numExpr.dVal);
repository.VerifyAll();
}