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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.import { assertEquals, assertStrictEquals } from "../assert/mod.ts";import { BinarySearchNode } from "./_binary_search_node.ts";
let parent: BinarySearchNode<number>;let child: BinarySearchNode<number>;function beforeEach() {  parent = new BinarySearchNode(null, 5);  child = new BinarySearchNode(parent, 7);  parent.right = child;}
Deno.test("BinarySearchNode", () => {  beforeEach();  assertStrictEquals(parent.parent, null);  assertStrictEquals(parent.left, null);  assertStrictEquals(parent.right, child);  assertStrictEquals(parent.value, 5);
  assertStrictEquals(child.parent, parent);  assertStrictEquals(child.left, null);  assertStrictEquals(child.right, null);  assertStrictEquals(child.value, 7);});
Deno.test("BinarySearchNode.from()", () => {  beforeEach();  const parentClone: BinarySearchNode<number> = BinarySearchNode.from(parent);  const childClone: BinarySearchNode<number> = BinarySearchNode.from(child);
  assertStrictEquals(parentClone.parent, null);  assertStrictEquals(parentClone.left, null);  assertStrictEquals(parentClone.right, child);  assertStrictEquals(parentClone.value, 5);
  assertStrictEquals(childClone.parent, parent);  assertStrictEquals(childClone.left, null);  assertStrictEquals(childClone.right, null);  assertStrictEquals(childClone.value, 7);});
Deno.test("BinarySearchNode.directionFromParent()", () => {  beforeEach();  const child2 = new BinarySearchNode(parent, 3);  assertEquals(child2.directionFromParent(), null);  parent.left = child2;  assertEquals(child2.directionFromParent(), "left");  assertEquals(parent.directionFromParent(), null);  assertEquals(child.directionFromParent(), "right");});
Deno.test("BinarySearchNode.findMinNode()", () => {  beforeEach();  assertStrictEquals(parent.findMinNode(), parent);  const child2 = new BinarySearchNode(parent, 3);  parent.left = child2;  assertStrictEquals(parent.findMinNode(), child2);  const child3 = new BinarySearchNode(child2, 4);  child2.right = child3;  assertStrictEquals(parent.findMinNode(), child2);  const child4 = new BinarySearchNode(child2, 2);  child2.left = child4;  assertStrictEquals(parent.findMinNode(), child4);});
Deno.test("BinarySearchNode.findMaxNode()", () => {  beforeEach();  assertStrictEquals(parent.findMaxNode(), child);  const child2 = new BinarySearchNode(child, 6);  child.left = child2;  assertStrictEquals(parent.findMaxNode(), child);  const child3 = new BinarySearchNode(child2, 6.5);  child2.right = child3;  assertStrictEquals(parent.findMaxNode(), child);  const child4 = new BinarySearchNode(child2, 8);  child.right = child4;  assertStrictEquals(parent.findMaxNode(), child4);  parent.right = null;  assertStrictEquals(parent.findMaxNode(), parent);});
Deno.test("BinarySearchNode.findSuccessorNode()", () => {  beforeEach();  assertStrictEquals(parent.findSuccessorNode(), child);  assertStrictEquals(child.findSuccessorNode(), null);  const child2 = new BinarySearchNode(child, 6);  child.left = child2;  assertStrictEquals(parent.findSuccessorNode(), child2);  assertStrictEquals(child.findSuccessorNode(), null);});