public void WhenEvalIsCalledOnAnUnitializedOpNode_ShouldThrowInvalidOperationException()
{
// Arrange
OpNode testOpNode = new OpNode();
// Act
testOpNode.Eval();
// Assert is handled by the ExpectedException attribute on the test method.
}
public void EvalMultiplyTest()
{
// Arrange
double testLeftValue = 11.3214;
double testRightValue = 3485;
ExpNode testLeftNode = new ValNode(testLeftValue);
ExpNode testRightNode = new ValNode(testRightValue);
OpNode testOpNode = new OpNode(ref testLeftNode, ref testRightNode, '*');
// Act and Assert
Assert.AreEqual((testLeftValue * testRightValue), testOpNode.Eval());
}