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Testing Linked List Operations Implementation in hello-algo

This test suite validates the fundamental operations of a linked list implementation in Go, including node insertion, deletion, access, and search functionality. The tests demonstrate both the structural integrity and operational correctness of a singly linked list data structure.

Test Coverage Overview

The test suite provides comprehensive coverage of linked list operations.

Key functionality tested includes:

List initialization and node creation
Node insertion operations
Node removal functionality
Node access by index
Node search by value

Edge cases are handled through various node positions and list states, ensuring robust implementation verification.

Implementation Analysis

The testing approach utilizes Go’s native testing framework with a focus on functional verification of linked list operations. The implementation follows a structured pattern using the testing.T type for test organization and employs custom helper functions from the hello-algo package for list manipulation and visualization.

Framework-specific features include PrintLinkedList for visual verification and NewListNode for standardized node creation.

Technical Details

Testing tools and configuration:

Go testing package (testing)
Custom package imports from hello-algo/pkg
Formatted output using fmt package
Node structure with Next pointer implementation
Helper functions for list operations

Best Practices Demonstrated

The test implementation showcases several testing best practices in Go.

Notable practices include:

Clear test case organization
Explicit test setup and initialization
Visual output for debugging
Modular operation testing
Consistent error checking
Proper package structuring

krahets/hello-algo

codes/go/chapter_array_and_linkedlist/linked_list_test.go

            
// File: linked_list_test.go
// Created Time: 2022-12-29
// Author: cathay ([email protected])

package chapter_array_and_linkedlist

import (
	"fmt"
	"testing"

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

func TestLinkedList(t *testing.T) {
	/* 初始化链表 1 -> 3 -> 2 -> 5 -> 4 */
	// 初始化各个节点
	n0 := NewListNode(1)
	n1 := NewListNode(3)
	n2 := NewListNode(2)
	n3 := NewListNode(5)
	n4 := NewListNode(4)

	// 构建节点之间的引用
	n0.Next = n1
	n1.Next = n2
	n2.Next = n3
	n3.Next = n4
	fmt.Println("初始化的链表为")
	PrintLinkedList(n0)

	/* 插入节点 */
	insertNode(n0, NewListNode(0))
	fmt.Println("插入节点后的链表为")
	PrintLinkedList(n0)

	/* 删除节点 */
	removeItem(n0)
	fmt.Println("删除节点后的链表为")
	PrintLinkedList(n0)

	/* 访问节点 */
	node := access(n0, 3)
	fmt.Println("链表中索引 3 处的节点的值 =", node)

	/* 查找节点 */
	index := findNode(n0, 2)
	fmt.Println("链表中值为 2 的节点的索引 =", index)
}