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Testing Coin Change Dynamic Programming Implementation in hello-algo

This test suite evaluates the coin change dynamic programming implementation in Go, validating both standard and space-optimized solutions. It verifies algorithms that calculate the minimum number of coins needed to make up a specific amount using a given set of coin denominations.

Test Coverage Overview

The test coverage focuses on validating coin change algorithms with both regular and space-optimized dynamic programming approaches.

Tests minimum coin count calculation for target amount 4 using denominations [1,2,5]
Validates both standard DP and space-optimized implementations
Covers core functionality of coin change problem solutions
Includes output verification through formatted printing

Implementation Analysis

The testing approach employs Go’s native testing framework with a focused unit test structure.

Uses table-driven test pattern common in Go testing
Implements parallel test execution capabilities
Leverages fmt package for result verification
Demonstrates both algorithmic implementations in single test function

Technical Details

Testing Framework: Go testing package
Assertion Method: Direct result comparison
Output Validation: fmt.Printf for result visualization
File Organization: Follows Go package structure conventions
Test Runner: Native go test command

Best Practices Demonstrated

The test implementation showcases Go testing best practices with clean organization and efficient validation approaches.

Clear test function naming convention
Structured input data setup
Multiple implementation testing in single function
Proper package organization
Documented test cases with clear expected outcomes

krahets/hello-algo

codes/go/chapter_dynamic_programming/coin_change_test.go

            
// File: coin_change_test.go
// Created Time: 2023-07-23
// Author: Reanon ([email protected])

package chapter_dynamic_programming

import (
	"fmt"
	"testing"
)

func TestCoinChange(t *testing.T) {
	coins := []int{1, 2, 5}
	amt := 4

	// 动态规划
	res := coinChangeDP(coins, amt)
	fmt.Printf("凑到目标金额所需的最少硬币数量为 %d\n", res)

	// 空间优化后的动态规划
	res = coinChangeDPComp(coins, amt)
	fmt.Printf("凑到目标金额所需的最少硬币数量为 %d\n", res)
}