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JUNIT Tutorial For Beginners

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Git hub repository for the free Udemy course :

Get started with Junit


Section 1 Foundation

  • What is JUnit?
  • Why Unit Testing?

Section 2 First JUnit Example

@Test Annotation - Running JUnit - No Failure = Success - Basic Assert methods

Section 3 Second JUnit Example

  • assertTrue and assertFalse methods
  • @Before @After annotations
  • @BeforeClass @AfterClass annotations

Section 4 JUnit Simple Test Scenarios

  • Comparing Arrays
  • Testing Exceptions
  • Performance Unit Tests

Section 5 JUnit Intermediate Test Scenarios

  • Parameterized Tests
  • Test Suites

Section 6 JUnit Best Practices

  • Naming Test Methods
  • Highlight Important Values in Tests
  • Handle Exceptions Properly
  • Readable Assert Statements

Starting Examples

package com.in28minutes.junit.helper;

public class StringHelper {

public String truncateAInFirst2Positions(String str) {
    if (str.length() <= 2)
        return str.replaceAll("A", "");

    String first2Chars = str.substring(0, 2);
    String stringMinusFirst2Chars = str.substring(2);

    return first2Chars.replaceAll("A", "") 
            + stringMinusFirst2Chars;

public boolean areFirstAndLastTwoCharactersTheSame(String str) {

    if (str.length() <= 1)
        return false;
    if (str.length() == 2)
        return true;

    String first2Chars = str.substring(0, 2);

    String last2Chars = str.substring(str.length() - 2);

    return first2Chars.equals(last2Chars);


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At in28Minutes, we ask ourselves one question everyday

How do we create more amazing course experiences? We use 80-20 Rule. We discuss 20% things used 80% of time in depth.

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