Junit 5 Logging

Java.util.logging

Java.util.logging is a basic logging mechanism provided by Java by default. if no external logging framework is used, then Java.util.logging comes handy.

To use logging first create a static instance of Logger.

static final Logger logger = Logger.getLogger(TestLifecycleLogger.class.getName());

package com.example.junit5.sujan;

public class AppleCalculator {
    public int addApple(int apple1, int apple2) {
        return apple1 + apple2;
    }
}

package org.wesome.junit5;

import org.junit.jupiter.api.Test;

import java.util.logging.Logger;

import static org.junit.jupiter.api.Assertions.assertEquals;

class AppleCalculatorTest {
    static final Logger log = Logger.getLogger(AppleCalculatorTest.class.getName());

    @Test
    void addApple() {
        AppleCalculator appleCalculator = new AppleCalculator();
        int apple = appleCalculator.addApple(1, 1);
        log.info("apple " + apple);
        assertEquals(2, apple, " 1 apple + 1 apple is 2 apple ");
    }
}

plugins {
    id 'java'
}

group 'org.example'
version '1.0-SNAPSHOT'

repositories {
    mavenCentral()
}

dependencies {
    testImplementation('org.junit.jupiter:junit-jupiter:5.6.2')
}

Lombok log4j2

Lombok has become a very useful library to avoid the boiler plate code. it provides a lot of annotation and functionality to increase productivity.

package org.wesome.junit5;

import lombok.extern.log4j.Log4j2;

@Log4j2
public class AppleCalculator {
    public int addApple(int apple1, int apple2) {
        int apple = apple1 + apple2;
        log.info("input is {} and {}, after computation output is {}", apple1, apple2, apple);
        return apple;
    }
}

package org.wesome.junit5;

import lombok.extern.log4j.Log4j2;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;

@Log4j2
class AppleCalculatorTest {

    @Test
    void addApple() {
        AppleCalculator appleCalculator = new AppleCalculator();
        int apple = appleCalculator.addApple(1, 1);
        log.info("total apple is {}", apple);
        assertEquals(2, apple, " 1 apple + 1 apple is 2 apple ");
    }
}

plugins {
    id 'java'
    id 'io.freefair.lombok' version '6.0.0-m2'
}

group 'org.wesome'
version '1.0-SNAPSHOT'

repositories {
    mavenCentral()
}

dependencies {
    testImplementation('org.junit.jupiter:junit-jupiter:5.6.2')
}