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JUNIT Tutorial For Beginners

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JUnitIn28Minutes

Git hub repository for the free Udemy course : https://www.udemy.com/course/junit-tutorial-for-beginners-with-java-examples/

Get started with Junit

Topics

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);
}

}

About in28Minutes

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Our Approach

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  • Practical, Real World Application Examples.
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About in28Minutes

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.

We are creating amazing learning experiences for learning Spring Boot with AWS, Azure, GCP, Docker, Kubernetes and Full Stack. 300,000 Learners rely on our expertise. Find out more....

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