What is JUnit 5? JUnit 5 is actually a combination of three main elements. It’s a mix of JUnit Platform, JUnit Jupiter API, and JUnit Vintage API. Let’s break it down. JUnit Platform Think of JUnit 5 as having a solid foundation called the JUnit Platform. This platform is like the engine that gets your…
Read More What is JUnit 5? (+Video Tutorial)In this tutorial, I’m going to walk you through how to execute a JUnit 5 test case from a command-line terminal without the use of Maven or Gradle. If you’re just starting out with Java or JUnit, you’re in the right place. I’ll explain everything in detail, step-by-step, so you can follow along even if…
Read More Run JUnit 5 Tests from Command Line without Maven or GradleThe @DisplayName annotation is used to provide a custom name for your JUnit 5 test method. Let’s have a look how it is used in Java code. Below, is a very simple code example of a JUnit 5 test method. Notice how the @DisplayName annotation is used to provide a custom name for the text…
Read More @DisplayName Annotation in JUnit 5When we do integration testing of our Spring Boot application, we sometimes need to make it load an alternative configuration. For example, we might need to run and test our application on a different port number, make it connect to a database as a different user or even make it connect to a different database.…
Read More @TestPropertySource Annotation ExampleThis tutorial will guide you through the process of running Unit Tests and Integration Tests separately in a Maven-based Spring Boot application. We will use the JUnit Tag feature to group our test cases and separate Unit Tests from Integration Tests. To learn more, check out the Test Java code tutorials page. Create your tests…
Read More Running Unit Tests and Integration Tests Separately in Spring BootIn this tutorial, you will learn how to use the @Tag annotation in JUnit 5 for organizing and running your unit tests. By the end of this tutorial, you’ll have a solid understanding of the @Tag annotation, its benefits, and how to apply it effectively in your own test cases. Let’s dive in! What is…
Read More @Tag Annotation: Organizing and Running Tests in JUnit 5If you’re an absolute beginner looking to learn about integration testing for Spring Boot applications with a MySQL database server, then you’re in the right place. As you proceed through this tutorial, remember that everyone was once a beginner, and the only silly question is the one you don’t ask. This tutorial aims to introduce…
Read More Integration Testing with Spring Boot, MySQL and TestcontainersMocking a static or private method is often necessary when writing unit tests. However, before Mockito 3.4.0, it was impossible to explicitly mock static methods. Thus, PowerMock offers solutions to the defined use case. In this article, we will look at the introduction of PowerMock and explore examples of mocking private, static, and final methods.…
Read More A Guide to Mocking Private and Static Methods Using PowerMockMethod security testing is the process of testing the security of each method to make sure that only authorized users can access them. By testing the method-level security, we can ensure that our application is secure and that users can only perform the actions that they are authorized to do. Let’s say we built an…
Read More Testing Method Security in Spring BootIn order to simulate the behaviour of any argument of the specified type during unit testing, we can utilize Mockito argument matchers. In this tutorial, we’ll discuss an Introduction to the Mockito Argument Matchers along with some examples and the creation of a custom argument matcher. So, let’s begin! If you are not familiar with…
Read More Mockito Argument Matchers: Examples and UsageThis tutorial will guide you on how to incorporate JUnit support into your Spring Boot application based on Maven. Spring Boot Starter Test Dependency To add JUnit and Mockito support to your Maven-based Spring Boot application, include the following dependencies in the <dependencies> section of your pom.xml file: <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> By adding…
Read More JUnit Support in Spring BootIn this tutorial, you will learn how to use @MockBean annotation in your Unit tests. @MockBean annotation is used to create and place mocks into Spring Application Contexts. If Spring Application Context does already have a bean of the same type then this bean will be replaced with a mock object. Otherwise, a new bean(mock)…
Read More How to use @MockBean AnnotationA test suite is a collection of test cases that are run together as a single unit. It helps to organize and manage the execution of multiple test cases. Test suites can be used to group related tests or to test different aspects of a complex system. They can also be used to run tests…
Read More JUnit 5 Test Suite TutorialIn the world of testing, mock objects are used to simulate the behavior of real objects in the application. Mockito is a popular framework for creating mock objects in Java. A Spy in Mockito is a type of mock object that allows you to create a partial mock of an object by spying on an…
Read More Mockito Spy Explained: A Comprehensive GuideIn this tutorial, you will learn how to write a JUnit test that validates whether the method under test throws the correct exception. The tutorial includes examples for both JUnit 5 and JUnit 4. For video lessons, check out my video course: Testing Java with JUnit and Mockito. Let’s begin with JUnit 5 version first.…
Read More Test for Exception in JUnit 5 and JUnit 4