public void getHeightTest_EmptyTree_ReturnZero()
{
//arrange
var myBST = new binarySearchTree <String>();
//act
//assert
Assert.AreEqual(0, myBST.getHeight());
}
public void getHeightTest_TwoNode_ReturnTwo()
{
//arrange
var myBST = new binarySearchTree <int>();
//act
myBST.addNode(1);
myBST.addNode(2);
//assert
Assert.AreEqual(2, myBST.getHeight());
}