Gain insights into unit testing with JUnit 5. Learn about assertions, assumptions, nested and parameterized tests, advanced JUnit 5 concepts, and integrating tests with Maven and Gradle.

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junit5.tar.gz

mvn clean test

Unit Testing is a basic and essential skill to learn for any developer. In this course, you will learn what unit tests are, why they are important, and how to test your Java applications using the JUnit 5 Framework —  the most popular unit testing framework in the market for Java developers.

You will start with the fundamentals of Unit Testing and JUnit 5 and then gradually you will dive deep into the core concepts like assertions, assumptions, different types of tests like nested tests, parameterized tests, repeated tests, and more.

You will also learn some advanced concepts of JUnit 5 like the JUnit 5 extension model, dependency injection, how to migrate existing unit tests from JUnit 4 to JUnit 5, and how to integrate your unit tests with Maven and Gradle.

Unit Testing Java Applications using JUnit 5

**Apache Maven**  is a project management tool that helps us build projects, manage dependencies, create project reports, and generate documentation.


# Maven build life cycle

To build our project, Maven follows a build lifecycle that goes through the following phases.

- **Validate**: Verifies whether the `pom.xml` is valid.
- **Compile**: Compiles the source code.
- **Test**: Runs the unit tests inside the project.
- **Package:** Packages the source code into an artifact.
- **Verify:** Runs integration tests, and verifies the validity package.
- **Install:** Installs the package into the local repository.
- **Deploy:** Deploys the package into the remote repository.

We’re mainly interested in the test phase of the lifecycle. This is where the unit tests inside our project are executed.

# Command to execute test

Maven defines a goal for each phase in the build lifecycle.

We use the following command to execute the tests inside our project.


`mvn test`

# Maven Surefire Plugin

To run the above command and execute the tests, we add `maven-surefire-plugin` to the `pom.xml` file.


The plugin configuration looks like:





Before We Begin

Introduction to JUnit 5

Junit 5 Core Concepts

Dynamic Tests

Dependency Injection in JUnit 5

JUnit 5 Extensions

Migrating from Junit 4 to Junit 5

Appendix

BONUS: Useful Assertion Libraries

Conclusion

Running JUnit5 Tests with Maven