Java remains a popular programming language due to its versatility, platform independence, and extensive resources, boasting a developer community of over nine million. Java unit testing frameworks, which provide standardized and extensible tools for building applications, are essential for ensuring software reliability and security. The article reviews ten notable Java testing frameworks for 2021, including JBehave, JUnit, Serenity, TestNG, Selenide, Gauge, Geb, Spock, HttpUnit, and JWebUnit, each offering unique features and benefits for different testing needs, such as Behavior-Driven Development (BDD) and integration with other tools like Selenium WebDriver. These frameworks facilitate efficient and automated testing processes, allowing developers and testers to create robust applications with enhanced functionality and performance. The choice of framework is critical and depends on specific project requirements, with the article emphasizing the importance of selecting compatible test automation platforms like LambdaTest to optimize testing across diverse environments.