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Connect to a Database Instance Running Inside a Java Testcontainer Using IntelliJ IDEA

JUnit is one of the most popular unit testing frameworks used with Java to create repeatable tests. With JUnit, each test is written as a separate method inside a Java class. IntelliJ IDEA provides an option to run these test cases from within the IDE.

In case you have a module that communicates with a MySQL database, you can unit test the module by providing it access to a MySQL server running inside a Testcontainer. You can also configure this MySQL database instance with your desired username, password, and database name (in MySQL server) using the API provided by the Testcontainers framework.

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MUnit Towards Automated Unit Test Cases

Test beakers
Find out how to use MUnit with Mule for automated unit testing.

Why Unit Testing?

This is the first question most beginners ask when they struggle to relate unit test cases with real scenarios, like what value-added unit testing is doing. This was my first thought after reading JUnit documents fifteen years back. I am sure most new developers would have similar feelings after reading unit test documents alone, but I realized that unit testing is a powerful tool to release defect-free code to production. The unit testing helps to do regression testing and gives confidence for new developers to make changes to the old codebase.

MUnit For Mule Flows

MUnit is an extension of JUnit. Developers are allowed to write XML-based test cases or Java code-based test cases for Mule flows. This document covers MUnit basics, practical options for different scenarios, and automating the business validations.

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Best Java Unit Testing Frameworks

Learn more about the best Java unit testing frameworks.

Unit testing is an important skill for programmers. With that said, what are the best frameworks you can use to write great unit tests in Java?

You may also like: 8 Benefits of Unit Testing

What We Will Learn

  • What are the best Java unit testing frameworks?
  • What is JUnit? How do you use JUnit for unit testing?
  • What is Mockito?
  • What is mocking?
  • How do you write unit tests with Junit, Mockito, AssertJ, and other frameworks?
  • What is the best Java unit testing framework for writing great asserts?

The Base Unit Testing Framework — JUnit/TestNG

Whenever you write a unit test, you execute the code and then check its output. You need a basic framework in place to run a large number of tests in a similar manner.