public void RotateLeft()
{
var A = new MockBinaryTreeNode <int, string>(50, "A");
var B = new MockBinaryTreeNode <int, string>(30, "B");
var C = new MockBinaryTreeNode <int, string>(20, "C");
var D = new MockBinaryTreeNode <int, string>(40, "D");
var E = new MockBinaryTreeNode <int, string>(35, "E");
var F = new MockBinaryTreeNode <int, string>(45, "F");
var G = new MockBinaryTreeNode <int, string>(47, "G");
A.Parent = null;
A.LeftChild = B;
A.RightChild = null;
B.Parent = A;
B.LeftChild = C;
B.RightChild = D;
C.Parent = B;
C.LeftChild = null;
C.RightChild = null;
D.Parent = B;
D.LeftChild = E;
D.RightChild = F;
E.Parent = D;
E.LeftChild = null;
E.RightChild = null;
F.Parent = D;
F.LeftChild = null;
F.RightChild = G;
G.Parent = F;
G.LeftChild = null;
G.RightChild = null;
Assert.IsTrue(HasBinarySearchTreeOrderProperty <MockBinaryTreeNode <int, string>, int, string>(A));
var tree = new MockBinarySearchTreeBase <int, string>();
tree.RotateLeft(B);
Assert.IsTrue(HasBinarySearchTreeOrderProperty <MockBinaryTreeNode <int, string>, int, string>(A));
Assert.IsTrue(A.Parent == null);
Assert.IsTrue(A.LeftChild.Equals(D));
Assert.IsTrue(A.RightChild == null);
Assert.IsTrue(B.Parent.Equals(D));
Assert.IsTrue(B.LeftChild.Equals(C));
Assert.IsTrue(B.RightChild.Equals(E));
Assert.IsTrue(C.Parent.Equals(B));
Assert.IsTrue(C.LeftChild == null);
Assert.IsTrue(C.RightChild == null);
Assert.IsTrue(D.Parent.Equals(A));
Assert.IsTrue(D.LeftChild.Equals(B));
Assert.IsTrue(D.RightChild.Equals(F));
Assert.IsTrue(E.Parent.Equals(B));
Assert.IsTrue(E.LeftChild == null);
Assert.IsTrue(E.RightChild == null);
Assert.IsTrue(F.Parent.Equals(D));
Assert.IsTrue(F.LeftChild == null);
Assert.IsTrue(F.RightChild.Equals(G));
Assert.IsTrue(G.Parent.Equals(F));
Assert.IsTrue(G.LeftChild == null);
Assert.IsTrue(G.RightChild == null);
}