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Testing Binary Tree Construction Algorithm in hello-algo

This test suite validates the binary tree construction algorithm that builds a tree from preorder and inorder traversal arrays. It demonstrates the implementation of a divide-and-conquer approach in Go for tree reconstruction, with comprehensive test cases to verify correct tree structure formation.

Test Coverage Overview

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

Key areas tested include:

Correct tree structure formation from preorder and inorder arrays
Node relationships and hierarchy verification
Handling of sample tree data with multiple nodes
Visual validation through tree printing functionality

Implementation Analysis

The testing approach utilizes Go’s native testing framework with custom visualization helpers. The implementation leverages the PrintTree and PrintSlice utilities from the hello-algo package for verification output.

Testing patterns include:

Direct function invocation testing
Visual output verification
Integration with custom tree printing utilities
Structured test data preparation

Technical Details

Testing infrastructure includes:

Go testing framework (testing package)
Custom tree visualization utilities
Hello-algo package integration
Slice manipulation utilities
Console output formatting for verification

Best Practices Demonstrated

The test implementation showcases several testing best practices in Go.

Notable practices include:

Clear test data preparation and initialization
Visual output for manual verification
Integration with package utilities
Focused test scope with single responsibility
Readable test structure and organization

krahets/hello-algo

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("前序遍历 = ")
	PrintSlice(preorder)
	fmt.Print("中序遍历 = ")
	PrintSlice(inorder)

	root := buildTree(preorder, inorder)
	fmt.Println("构建的二叉树为：")
	PrintTree(root)
}