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Testing Binary Tree DFS Traversal Implementations in hello-algo

A comprehensive test suite for validating binary tree depth-first search traversal implementations in Go. This test file verifies pre-order, in-order, and post-order traversal algorithms using a sample binary tree structure.

Test Coverage Overview

The test suite provides thorough coverage of depth-first search traversal operations on binary trees.

Key areas tested include:

Pre-order traversal sequence validation
In-order traversal sequence validation
Post-order traversal sequence validation
Binary tree initialization from array input

Edge cases are handled through the SliceToTree conversion function, ensuring robust tree construction.

Implementation Analysis

The testing approach utilizes Go’s native testing framework with a focus on functional verification of traversal algorithms.

Testing patterns include:

Centralized test setup with tree initialization
Sequential validation of different traversal methods
Visual tree structure verification using PrintTree
Global state management for traversal results

Technical Details

Testing tools and configuration:

Go testing package (testing)
Custom tree visualization (PrintTree)
Helper utility for tree construction (SliceToTree)
Package-level imports from hello-algo/pkg
Standard Go test execution environment

Best Practices Demonstrated

The test implementation showcases several testing best practices for Go applications.

Notable practices include:

Clear test function naming conventions
Isolated test scenarios
Visual feedback for test execution
Modular test structure
Reusable tree initialization logic

krahets/hello-algo

codes/go/chapter_tree/binary_tree_dfs_test.go

            
// File: binary_tree_dfs_test.go
// Created Time: 2022-11-26
// Author: Reanon ([email protected])

package chapter_tree

import (
	"fmt"
	"testing"

	. "github.com/krahets/hello-algo/pkg"
)

func TestPreInPostOrderTraversal(t *testing.T) {
	/* 初始化二叉树 */
	// 这里借助了一个从数组直接生成二叉树的函数
	root := SliceToTree([]any{1, 2, 3, 4, 5, 6, 7})
	fmt.Println("\n初始化二叉树: ")
	PrintTree(root)

	// 前序遍历
	nums = nil
	preOrder(root)
	fmt.Println("\n前序遍历的节点打印序列 =", nums)

	// 中序遍历
	nums = nil
	inOrder(root)
	fmt.Println("\n中序遍历的节点打印序列 =", nums)

	// 后序遍历
	nums = nil
	postOrder(root)
	fmt.Println("\n后序遍历的节点打印序列 =", nums)
}