public void CompositeEquationConsistsOfTwoMembersAndAnOperator()
{
var left = new SingleEquation<int>(1);
var right = new SingleEquation<int>(2);
var op = Substitute.For<EquationOperator<int>>();
var sut = new CompositeEquation<int>(left, op, right);
Assert.AreEqual(left, sut.Left);
Assert.AreEqual(right, sut.Right);
Assert.AreEqual(op, sut.Operator);
}
public void CompositeEquationHasStringPresentation()
{
var left = Substitute.For<Equation<int>>();
left.ToString().Returns("l");
var right = Substitute.For<Equation<int>>();
right.ToString().Returns("r");
var op = Substitute.For<EquationOperator<int>>();
op.ToString().Returns("op");
var sut = new CompositeEquation<int>(left, op, right);
Assert.AreEqual("(lopr)", sut.ToString());
}
public void CompositeEquationCanContainCompositeMembers()
{
var op = Substitute.For<EquationOperator<long>>();
var left = new CompositeEquation<long>(new SingleEquation<long>(1), op,
new SingleEquation<long>(2));
var right = new CompositeEquation<long>(new SingleEquation<long>(1), op,
new SingleEquation<long>(2));
var sut = new CompositeEquation<long>(left, op, right);
Assert.AreEqual(left, sut.Left);
Assert.AreEqual(right, sut.Right);
Assert.AreEqual(op, sut.Operator);
}
public void CompositeEquationEvaluatesWithOperator()
{
var left = Substitute.For<Equation<int>>();
left.Value.Returns(1);
var right = Substitute.For<Equation<int>>();
right.Value.Returns(18);
var op = Substitute.For<EquationOperator<int>>();
op.Evaluate(1, 18).Returns(3);
var sut = new CompositeEquation<int>(left, op, right);
var actual = sut.Value;
Assert.AreEqual(3, actual);
}