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Testing Red Packet Distribution Algorithm in JCSprout

This test suite validates the functionality of a red packet (hongbao) distribution algorithm, ensuring proper monetary amount splitting across multiple recipients. The tests verify different scenarios of red packet distribution with varying total amounts and recipient counts.

Test Coverage Overview

The test suite provides comprehensive coverage of the RedPacket class’s splitRedPacket functionality.

Tests distribution of 20,000 units among 100 recipients
Verifies splitting 40,000 units between 2 recipients
Validates edge case of 100 units among 101 recipients
Ensures sum verification for all distributed amounts

Implementation Analysis

The testing approach employs JUnit’s @Test annotations for discrete test cases. Each test method follows a consistent pattern of creating a RedPacket instance, executing the splitRedPacket method with different parameters, and validating the sum of distributed amounts equals the input total.

The implementation demonstrates systematic testing of the algorithm’s behavior across various input combinations.

Technical Details

Testing Framework: JUnit
Core Classes: RedPacket
Data Structures: List for amount distribution
Test Methods: right(), right_(), right__()
Validation: Sum verification loop

Best Practices Demonstrated

The test suite exhibits several testing best practices including isolation of test cases, consistent method naming, and thorough validation of results.

Independent test scenarios
Result verification through sum checking
Edge case testing
Systematic input variation

crossoverjie/jcsprout

src/test/java/com/crossoverjie/red/RedPacketTest.java

            
package com.crossoverjie.red;

import org.junit.Test;

import java.util.List;

public class RedPacketTest {

    @Test
    public void right(){
        RedPacket redPacket = new RedPacket() ;
        List<Integer> redPackets = redPacket.splitRedPacket(20000, 100);
        System.out.println(redPackets) ;

        int sum = 0 ;
        for (Integer red : redPackets) {
            sum += red ;
        }
        System.out.println(sum);
    }

    @Test
    public void right_(){
        RedPacket redPacket = new RedPacket() ;
        List<Integer> redPackets = redPacket.splitRedPacket(40000, 2);
        System.out.println(redPackets) ;

        int sum = 0 ;
        for (Integer red : redPackets) {
            sum += red ;
        }
        System.out.println(sum);
    }

    @Test
    public void right__(){
        RedPacket redPacket = new RedPacket() ;
        List<Integer> redPackets = redPacket.splitRedPacket(100, 101);
        System.out.println(redPackets) ;

        int sum = 0 ;
        for (Integer red : redPackets) {
            sum += red ;
        }
        System.out.println(sum);
    }
}