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Testing Binary Tree Construction from Traversal Arrays in hello-algo

This test suite validates the construction of binary trees from preorder and inorder traversal arrays, demonstrating a fundamental divide-and-conquer algorithm implementation in Go. The tests verify correct tree building functionality while ensuring proper node relationships and structure preservation.

Test Coverage Overview

The test suite focuses on validating binary tree construction from traversal arrays.

Key areas covered include:

Verification of tree structure integrity
Validation of node relationships and ordering
Testing with sample traversal sequences
Visual representation of constructed trees

Implementation Analysis

The testing approach utilizes Go’s native testing framework with custom visualization helpers. The implementation employs a straightforward test structure that combines functional verification with visual output, making it easier to validate the tree construction results.

Technical patterns include:

Direct array input testing
Tree structure validation
Visual tree representation
Integration with custom printing utilities

Technical Details

Testing infrastructure includes:

Go testing package (testing)
Custom tree visualization utilities
PrintSlice and PrintTree helper functions
Integration with hello-algo package utilities

Best Practices Demonstrated

The test implementation showcases several testing best practices including clear input definition, explicit expected outcomes, and visual verification capabilities. Notable practices include:

Clear test case organization
Visual output for debugging
Modular test structure
Integration with utility functions

krahets/hello-algo

zh-hant/codes/go/chapter_divide_and_conquer/build_tree_test.go

            
// File: build_tree_test.go
// Created Time: 2023-07-20
// Author: hongyun-robot ([email protected])

package chapter_divide_and_conquer

import (
	"fmt"
	"testing"

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

func TestBuildTree(t *testing.T) {
	preorder := []int{3, 9, 2, 1, 7}
	inorder := []int{9, 3, 1, 2, 7}
	fmt.Print("前序走訪 = ")
	PrintSlice(preorder)
	fmt.Print("中序走訪 = ")
	PrintSlice(inorder)

	root := buildTree(preorder, inorder)
	fmt.Println("構建的二元樹為：")
	PrintTree(root)
}