Back to Repositories

Validating Happy Number Algorithm Implementation in JCSprout

This test suite validates the HappyNum algorithm implementation, which determines whether a given number is a ‘happy number’ through recursive sum of squared digits calculation. The suite contains multiple test cases to verify both positive and negative scenarios.

Test Coverage Overview

The test suite provides comprehensive coverage of the HappyNum algorithm:

Tests positive case with number 19 (known happy number)
Validates negative case with number 11 (known unhappy number)
Includes edge case testing with number 100
Verifies boolean return values for happy/unhappy number determination

Implementation Analysis

The testing approach utilizes JUnit 4 framework features for systematic validation. Each test method follows the Arrange-Act-Assert pattern, instantiating a new HappyNum object and validating its isHappy() method behavior. The implementation leverages JUnit’s assertion mechanisms for explicit result verification.

The test structure demonstrates isolated test cases with clear input-output validation.

Technical Details

Testing Framework: JUnit 4
Assert Methods: assertEquals for boolean comparison
Test Method Annotations: @Test
Exception Handling: throws Exception declaration
Class Under Test: HappyNum with isHappy() method

Best Practices Demonstrated

The test suite exhibits several testing best practices:

Method naming clearly indicates test purpose
Independent test cases with separate method implementations
Consistent object initialization pattern
Explicit assertion statements
Mix of positive, negative, and edge case scenarios

crossoverjie/jcsprout

src/test/java/com/crossoverjie/algorithm/HappyNumTest.java

            
package com.crossoverjie.algorithm;

import org.junit.Assert;
import org.junit.Test;

public class HappyNumTest {
    @Test
    public void isHappy() throws Exception {
        HappyNum happyNum = new HappyNum() ;
        boolean happy = happyNum.isHappy(19);
        Assert.assertEquals(happy,true);
    }

    @Test
    public void isHappy2() throws Exception {
        HappyNum happyNum = new HappyNum() ;
        boolean happy = happyNum.isHappy(11);
        Assert.assertEquals(happy,false);
    }

    @Test
    public void isHappy3() throws Exception {
        HappyNum happyNum = new HappyNum() ;
        boolean happy = happyNum.isHappy(100);
        System.out.println(happy);
    }

}