Run single test from a JUnit class using command-line

by

You can make a custom, barebones JUnit runner fairly easily. Here’s one that will run a single test method in the form com.package.TestClass#methodName:

import org.junit.runner.JUnitCore;
import org.junit.runner.Request;
import org.junit.runner.Result;

public class SingleJUnitTestRunner {
    public static void main(String... args) throws ClassNotFoundException {
        String[] classAndMethod = args[0].split("#");
        Request request = Request.method(Class.forName(classAndMethod[0]),
                classAndMethod[1]);

        Result result = new JUnitCore().run(request);
        System.exit(result.wasSuccessful() ? 0 : 1);
    }
}

You can invoke it like this:

> java -cp path/to/testclasses:path/to/junit-4.8.2.jar SingleJUnitTestRunner 
    com.mycompany.product.MyTest#testB

After a quick look in the JUnit source I came to the same conclusion as you that JUnit does not support this natively. This has never been a problem for me since IDEs all have custom JUnit integrations that allow you to run the test method under the cursor, among other actions. I have never run JUnit tests from the command line directly; I have always let either the IDE or build tool (Ant, Maven) take care of it. Especially since the default CLI entry point (JUnitCore) doesn’t produce any result output other than a non-zero exit code on test failure(s).

NOTE:
for JUnit version >= 4.9 you need hamcrest library in classpath

More Related Contents:

  1. How do I test a class that has private methods, fields or inner classes?
  2. Java: How to test methods that call System.exit()?
  3. How to run test methods in specific order in JUnit4?
  4. JUnit: How to simulate System.in testing?
  5. Assert equals between 2 Lists in Junit
  6. How to test void method with Junit testing tools?
  7. How to test that no exception is thrown?
  8. Multiple RunWith Statements in jUnit
  9. How to use ArgumentCaptor for stubbing?
  10. How to run all tests belonging to a certain Category in JUnit 4
  11. annotation to make a private method public only for test classes [duplicate]
  12. Grouping JUnit tests
  13. How to mock new Date() in java using Mockito
  14. How do I assert equality on two classes without an equals method?
  15. How to use JUnit to test asynchronous processes
  16. AssertEquals 2 Lists ignore order
  17. Using different classloaders for different JUnit tests?
  18. JUnit 4: Set up things in a test suite before tests are run (like a test’s @BeforeClass method, just for a test suite)
  19. How to test a Jersey REST web service?
  20. java.lang.NoClassDefFoundError in junit
  21. Why are my mocked methods not calld when executing a unit test?
  22. how to export (JUnit) test suite as executable jar
  23. Class Not Found: Empty Test Suite in IntelliJ
  24. Testing against Java EE 6 API
  25. How do I unit test jdbc code in java? [closed]
  26. How to mock a static final variable using JUnit, EasyMock or PowerMock
  27. JUnit: new instance before invoking each @Test method. What are the benefits?
  28. How to launch JUnit 5 (Platform) from the command line (without Maven/Gradle)?
  29. JUnit test with dynamic number of tests
  30. Easier DynamoDB local testing

Leave a Comment