JUnit and TestNG are the most popular testing frameworks for Java applications. Both of these frameworks are really good and easy to use. So when it comes to chose the testing framework for your application, it’s better to have a high-level idea of what features are present in one or the other and then take the informed decision based on your project requirements.
JUnit vs TestNG
JUnit current version is 5.2.0 and it’s still evolving and working on to include more features. TestNG current version is 6.14.3 and it’s mature and features rich.
Below table compares JUnit vs TestNG on different features. Note that I have excluded very specific or common features that are present in both these frameworks, such as testing exceptions, timeout settings, lifecycle callback methods etc.
|Annotations||Annotations Based||Annotations Based||Both JUnit 5 and TestNG are annotation based and they are similar in nature and behavior.||JUnit Annotations, TestNG Annotations|
|Ease of Use||JUnit 5 is built into various modules, you need JUnit Platform and JUnit Jupiter to write test cases. If you want more features such as Parameterized Tests then you need to add junit-jupiter-params module.||Single module to get all TestNG features||TestNG is better in terms of ease of use.||JUnit Maven Dependency, TestNG Maven Dependency|
|IDE Support||Supported on major IDEs such as Eclipse and IntelliJ IDEA||Supported on major IDEs such as Eclipse and IntelliJ IDEA||Both of them are similar and provides easy integration with major IDEs.||JUnit Tests Eclipse, TestNG Eclipse Plugin|
|Data Provider||Supports multiple ways to provide test data, such as methods, Enum, CSV, CSV Files etc.||Supports data provider methods and from test suite xml file.||JUnit is better for injecting test methods input data||JUnit Parameterized Tests, TestNG DataProvider, TestNG Parameters|
|Test Suite||JUnit 5 doesn’t support test suites yet, it’s work in progress as of writing this post. Follow this GitHub Issue to check the current status.||TestNG test cases are executed as test suite. We can use @Factory annotation to run multiple test classes. TestNG XML support is awesome in creating complex tests suites that are loosely coupled from your test cases.||TestNG is better for test suites||TestNG @Factory, TestNG XML Suite|
|HTML Reports||We need external plugin maven-surefire-report-plugin to generate HTML reports||TestNG automatically creates HTML reports for the test run.||TestNG HTML reports look outdated but it’s simple to use. If you have to share HTML reports with others, I would suggest to use JUnit.||JUnit HTML Report, TestNG Tutorial|
|Running from Java Main Method||We can use JUnit 5 launcher API to run tests from java main method.||We can use TestNG run() method to execute tests from the java main method.||Both of them supports execution of test cases from java main method.||JUnit Launcher API Docs, TestNG Tests from Java Main Method|
|Assertions||JUnit provides enough assertion methods to compare expected and actual test results||TestNG provides enough assertion methods to compare expected and actual test results||Both of them are similar in terms of Assertions support||JUnit Assertions|
|Assumptions||JUnit supports assumptions to skip tests based on certain conditions||TestNG doesn’t support assumptions||JUnit is better if you want to skip tests based on conditions||JUnit Assumptions|
|Test Order||JUnit 5 doesn’t support test order yet, it’s planned for 5.3 release. Follow this GitHub Issue to check the current status.||TestNG supports ordering of test methods through priority attribute||TestNG is better when you want to execute tests in specific order.|
|Disable Tests||JUnit supports many ways to disable and enable tests. For example, based on OS, JRE, system properties||TestNG supports disabling tests but it’s limited in functionality||JUnit is better when you want to disable or enable tests based on conditions||JUnit Disable Tests, TestNG Disable Tests|
|Parallel Execution||JUnit 5 doesn’t support parallel execution as of today. Follow this GitHub Issue to check the current status.||TestNG supports parallel execution if run through XML suite.||TestNG is better for parallel execution as of now, JUnit 5 development is going on to support this feature.||TestNG Parallel Execution|
|Listeners||JUnit supports listeners through Launcher API, there is no mechanism to add listeners using annotations.||TestNG supports various types of listeners and can be added using annotations.||TestNG listener support is much better compared to JUnit 5.||TestNG Listeners|
Above features comparison of TestNG vs JUnit should help you in finding the perfect fit for your application. Both of these are good testing frameworks or java application. However, JUnit 5 is still evolving and it will have all the missing features in the upcoming releases.