public void Evaluate_WithVariableReference_ReturnsValue()
{
const string variableName = "x";
const double variableValue = 1;
VariableReference reference=new VariableReference(variableName,variableValue);
Assert.AreEqual(1,reference.Evaluate());
}
public void ToString_WithVariableReference_ReturnsVariableName()
{
const string variableName = "x";
const double variableValue = 1;
VariableReference reference=new VariableReference(variableName,variableValue);
Assert.AreEqual("x",reference.ToString());
}
public void Evaluate_WithMultOperation_ReturnsResult()
{
IMathExpression leftOperand = new VariableReference("x", 1);
const char operationChar = '*';
IMathExpression rightOperand = new VariableReference("y", 1);
MathOperation operation = new MathOperation(leftOperand,
operationChar,
rightOperand);
Assert.AreEqual(1, operation.Evaluate());
}
public void Evaluate_WithReferences_ReturnsResult()
{
// x+ (y*2)
IMathExpression leftOperand = new VariableReference("x", 4);
const char operationChar = '+';
IMathExpression rightOperand = new VariableReference("y", 2);
MathOperation operation = new MathOperation(leftOperand,
operationChar,
new MathOperation(rightOperand,'*',new ConstantReference(2)));
Assert.AreEqual(8, operation.Evaluate());
}
