Java Unit Testing

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Unit testing for active Java development and for legacy code

Parasoft Jtest leverages AI to generate, augment, and reuse unit tests, while also optimizing the execution of those tests, to facilitate substantial improvements in the amount of time and cost associated with unit testing. Jtest users can release with confidence by creating JUnit test suites in half the time, and meet coverage targets while building a comprehensive, meaningful, and maintainable suite of JUnit test cases.

Java Unit Testing

How does it work?

Parasoft Jtest helps teams accelerate the adoption of unit testing as a best practice and scale it across the organization. Jtest’s revolutionary AI approach to unit testing is designed to be easy to use, reducing the time and effort of unit testing by more than 50%, from creation to maintenance. Jtest identifies coverage gaps and helps users increase their code coverage metrics via automatic recommendations and quick fixes, giving users an immediate return on their investment with the tool.

Jtest leverages commonly-used open-source technologies, such as JUnit, Mockito, and PowerMock, to easily fit into your development environment and make it easy to create, maintain, and execute tests. Since it’s not a vendor-locked unit testing solution, it’s easier to adopt, integrate, and scale as a solution.

Parasoft Jtest goes beyond just automatically creating unit tests, by providing unit test runtime analysis for each unit test execution, making it easier for users to debug and maintain their tests. Jtest provides a list of impacted unit tests, to help users understand the effects of change, and save time while being more productive in their unit testing, resulting in higher code coverage metrics and better-quality software.

Jtest’s unique approach to unit testing helps users create tests that are meaningful and test the true functionality of the code, with valid assertions. This approach makes unit testing more approachable for the entire team, giving novice unit testers a better understanding of what the test is doing, and helping expert unit testers save time and effort.


Parasoft Jtest provides automated tooling to support the unit testing process, helping users be more efficient creating, mocking, asserting (validating), and executing unit tests, with one-click actions and recommendations in the IDE. Jtest goes beyond creating a basic skeleton and lays the groundwork for the user by leveraging AI to analyze the source code and generate unit tests to optimize code coverage.

Next, Jtest helps the user initialize and isolate the unit under test, recommending mockable objects (leveraging open source mocking frameworks such as Mockito and PowerMock), using object factories, and guiding the user through object initialization. 

Jtest helps users validate tests by automatically inserting assertions into the JUnit test. Jtest can determine if an assertion is present or not, and if not, Jtest can track the method under test and recommend the correct assertions to add. The created unit tests can then be executed and integrated into an existing CI process as any other JUnit.

Jtest identifies areas of untested code and presents the user with recommendations for how to cover it. Then, with quick-fix actions, Jtest can clone and mutate existing tests to cover the untested code. 

Jtest can bulk generate unit tests for an entire project, package, or class, automatically performing all the groundwork, set up, and even mocking, giving the user a jump-start on their unit test suite. The user simply adds in additional business logic to the test and executes them.

Jtest helps users create parameterized tests,setting up the initial unit test code with parameter values stored in code or in an external CSV file to data drive the test with additional use-cases.  This results in more code paths being covered while reducing the number of unit tests needed. 

Jtest goes beyond ordinary unit testing tools by helping users analyze their JUnit test (whether or not it was created with Parasoft Jtest), making maintenance and execution of unit tests easier.

During unit test execution, Jtest generates a call trace for each unit test and analyzes the tests as they run, inspecting the code, collecting data, and looking at variables and how they change, along with assertions. Based on this analysis, Jtest identifies errors and failures and gives the user automatic recommendations to correct these problems. 

Jtest’s sophisticated analysis data allows the tool to determine when assertions are no longer valid, and provide quick fixes to replace the code with correct assertions. Jtest helps identify instabilities in the test environment and provides recommendations on how to resolve these issues.

Jtest uses AI-enabled test automation to correlate source code changes in the development environment with the entire JUnit test suite and performs test impact analysis to enable the user to automatically execute only the unit tests that were affected by their source code changes, rather than having to run the entire suite of tests over and over again.  This workflow can be used in the IDE as well as the CI process.

By leveraging Jtest to perform debugging and maintenance, users save time and effort and can focus on the regression, speeding up the entire unit testing process, and helping overall productivity.

Benefit from the Parasoft Approach

Want to learn more?

Parasoft Jtest integrates with a wide variety of software, tools, and frameworks,
so you can easily adopt and scale within your existing development environment.

JUnit Basics

JUnit Basics: Getting Started with JUnit and Using Automation to Create Unit Tests

In this tutorial, learn how to set up, write, and run JUnit tests and then scale your unit testing like a pro with automated Java testing.