Does TestNG support something like JUnit4's @Rule?

testng junit4
Francisco picture Francisco · May 23, 2011 · Viewed 13.8k times · Source

Does TestNG have something like @Rule? I am thinking specifically about:

@Rule public TemporaryFolder folder = ...

Or even

@Rule public MethodRule globalTimeout = new Timeout(20);

I am aware that I can manually implement these things using setUp() and tearDown() equivalents, but these don't give me the convenience that I get using @Rule.

Answer

Cedric Beust picture Cedric Beust · May 23, 2011

Rules are pretty easy to emulate, for example with super classes:

public void Base {
  @BeforeMethod
  public void createTempDir() { ... }

  @AfterMethod
  public void deleteTempDir() { ... }
}

public void MyTest extends Base {
  @Test
  ...
}

If you extend Base, a temporary directory will always be automatically created and then deleted.

The advantage of this approach over Rules is that Rules are always class scoped, while with TestNG, you can implement them around methods, tests, classes, groups and even suites.

Related questions

How to execute JUnit and TestNG tests in same project using maven-surefire-plugin?

Right now I have both type of tests but when I say "mvn test" it only executes TestNG tests and not Junit. I want to execute both one after another. Any Idea ?

Read More
assertEquals, what is actual and what is expected?

I always wondered what exactly is the meaning of actual and expected in assertEquals in libraries like TestNG. If we read the Java Docs we see: public static void assertEquals(... actual, ... expected) Parameters: actual - the actual value expected - …

Read More
TestNG ERROR Cannot find class in classpath

I'm trying to run testng via command line and I have following things in classpath: testng jar, jar of compiled test case file, and other required jars. testng.xml points to appropriate class in the hierarchy. Testng doesn't run instead …

Read More