CODEWITHSUNDEEP
javajunitparallel-processingjunit4
johnco3
johnco3

Reputation: 2642

how to initialize JUnit test classes before running in parallel

I am trying to execute JUnit tests in parallel using the ParallelComputer experimental feature, however I do not know how to pre-initialize each of the test classes before kicking off the tests.

The classic example of how these are supposed to be used is as follows (as shown in the following GitHub link). Per the example, how do I initialize the ParallelTest1 and ParallelTest2 classes with shared data before starting the parallel thread testing. I was able to do this via constructors in each of the classes, however I need to make sure that both classes are fully initialized before the run starts. This problem is probably not specific to the Parallel nature of how I wish to perform the testing but more likely how to use some special keywords to order prevent initialized objects from starting until required. Ideally the example ParallelComputerTest could have this shared data initialized in its constructor, however in that case, how could the nested static parallel test classes get access to this instance data?

public class ParallelComputerTest {  

   @Test  
    public void test() {      
      Class[] cls={ParallelTest1.class,ParallelTest2.class };  

      //Parallel among classes  
      JUnitCore.runClasses(ParallelComputer.classes(), cls);  

      //Parallel among methods in a class  
      JUnitCore.runClasses(ParallelComputer.methods(), cls);  

      //Parallel all methods in all classes  
      JUnitCore.runClasses(new ParallelComputer(true, true), cls);     
    }  
   public static class ParallelTest1{  
      @Test public void a(){}  
      @Test public void b(){}  
   }  
   public static class ParallelTest2{  
      @Test public void a(){}  
      @Test public void b(){}  
   }  
}

Upvotes: 2

Views: 4974

Answers (1)

Jordi Castilla
Jordi Castilla

Reputation: 26961

Use @Before for set ups and @After for clean ups.

For example to test console output I set up streams before and clean result after test like this:

@Before
public void setUpStreams() {
    System.setOut(new PrintStream(outContent));
    System.setErr(new PrintStream(errContent));
}

@After
public void cleanUpStreams() {
    System.setOut(null);
    System.setErr(null);
}

NOTE: this can cause problems with TestSuite, dunno if also with ParallelTest. If you experience some troubles AND you use JUnit 4.7 or higher you might like to check this link to rules feature

Upvotes: 4

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