public void SumExpressionInterpretForTwoVariablesReturnsTheirSum()
{
IExpression left = new VariableX();
IExpression right = new VariableX();
SumExpression sum = new SumExpression(left, right);
Context context = new Context(4);
Assert.AreEqual(8, sum.Interpret(context));
}
public void SumExpressionInterpretForConstantsAndVariableReturnsTheirSum()
{
IExpression left = new VariableX();
IExpression right = new Constant("2");
SumExpression sum = new SumExpression(left, right);
Context context = new Context(3);
Assert.AreEqual(5, sum.Interpret(context));
}
public void SumExpressionInterpretForTwoConstantsReturnsTheirSum()
{
Constant left = new Constant("23");
Constant right = new Constant("2");
SumExpression sum = new SumExpression(left, right);
Context context = new Context(3);
Assert.AreEqual(25, sum.Interpret(context));
}
public void MathFunctionReturnsValueAndCalculatesTheSentenceWithUnknown3()
{
// 2 + atan(x) + x
IExpression two = new Constant(2);
string function = "ata(x)";
FunctionConverter f = new FunctionConverter();
IExpression value = new VariableX();
IExpression mathFun = new MathFunction(f.Translator(function), value);
IExpression x = new VariableX();
IExpression result = new SumExpression(two, mathFun);
result = new SumExpression(result, x);
Context c = new Context(1);
var y = result.Interpret(c);
Assert.AreEqual(3.785, y, 4);
}
public void MathFunctionReturnsValueAndCalculatesTheSentenceWithFunLog2()
{
// 2 + cos(-123) + x
IExpression two = new Constant(2);
string function = "cos(-123)";
FunctionConverter f = new FunctionConverter();
IExpression value = new Constant(f.getValue(function));
IExpression mathFun = new MathFunction(f.Translator(function), value);
IExpression x = new VariableX();
IExpression result = new SumExpression(two, mathFun);
result = new SumExpression(result, x);
Context c = new Context(123);
var y = result.Interpret(c);
Assert.AreEqual(124.45, y, 2);
}