What order are the Junit Before After called

Question

I have an Integration Test Suite  I have a IntegrationTestBase class for all my tests to extend  This base class has a  Before  public void setUp    and  After  public void tearDown    method to establish API and DB connections  What I ve been doing is just overriding those two methods in each testcase and calling super setUp   and super tearDown    However this can cause problems if someone forgets to call the super or puts them at the wrong place and an exception is thrown and they forget to call super in the finally or something   What I want to do is make the setUp and tearDown methods on the base class final and then just add our own annotated  Before and  After methods  Doing some initial tests it appears to always call in this order   Base  Before Test  Before Test Test  After Base  After   but I m just a little concerned that the order isn t guaranteed and that it could cause problems  I looked around and haven t seen anything on the subject  Does anyone know if I can do that and not have any problems   Code   public class IntegrationTestBase         Before     public final void setUp      always called 1st           After     public final void tearDown      always called last         public class MyTest extends IntegrationTestBase         Before     public final void before      always called 2nd           Test     public void test      always called 3rd           After     public final void after      always called 4th

User · Accepted Answer

Yes  this behaviour is guaranteed    Before      The  Before methods of superclasses will be run before those of the current class  unless they are overridden in the current class  No other ordering is defined      After      The  After methods declared in superclasses will be run after those of the current class  unless they are overridden in the current class

User · Answer

If you turn things around  you can declare your base class abstract  and have descendants declare setUp and tearDown methods  without annotations  that are called in the base class  annotated setUp and tearDown methods

User · Answer

This isn t an answer to the tagline question  but it is an answer to the problems mentioned in the body of the question  Instead of using  Before or  After  look into using  org junit Rule because it gives you more flexibility   ExternalResource  as of 4 7  is the rule you will be most interested in if you are managing connections   Also  If you want guaranteed execution order of your rules use a RuleChain  as of 4 10    I believe all of these were available when this question was asked  Code example below is copied from ExternalResource s javadocs    public static class UsesExternalResource     Server myServer  new Server        Rule   public ExternalResource resource  new ExternalResource            Override       protected void before   throws Throwable             myServer connect                        Override       protected void after               myServer disconnect                            Test   public void testFoo           new Client   run myServer

User · Answer

You can use  BeforeClass annotation to assure that setup   is always called first  Similarly  you can use  AfterClass annotation to assure that tearDown   is always called last   This is usually not recommended  but it is supported   It s not exactly what you want - but it ll essentially keep your DB connection open the entire time your tests are running  and then close it once and for all at the end

User · Answer

I think based on the documentation of the  Before and  After the right conclusion is to give the methods unique names  I use the following pattern in my tests   public abstract class AbstractBaseTest       Before   public final void baseSetUp        or any other meaningful name     System out println  AbstractBaseTest setUp            After   public final void baseTearDown        or any other meaningful name     System out println  AbstractBaseTest tearDown            and   public class Test extends AbstractBaseTest       Before   public void setUp         System out println  Test setUp            After   public void tearDown         System out println  Test tearDown            Test   public void test1   throws Exception       System out println  test1            Test   public void test2   throws Exception       System out println  test2            give as a result   AbstractBaseTest setUp Test setUp test1 Test tearDown AbstractBaseTest tearDown AbstractBaseTest setUp Test setUp test2 Test tearDown AbstractBaseTest tearDown   Advantage of this approach  Users of the AbstractBaseTest class cannot override the setUp tearDown methods by accident  If they want to  they need to know the exact name and can do it    Minor  disadvantage of this approach  Users cannot see that there are things happening before or after their setUp tearDown  They need to know that these things are provided by the abstract class  But I assume that s the reason why they use the abstract class

User · Answer

One potential gotcha that has bitten me before    I like to have at most one  Before method in each test class  because order of running the  Before methods defined within a class is not guaranteed  Typically  I will call such a method setUpTest      But  although  Before is documented as The  Before methods of superclasses will be run before those of the current class  No other ordering is defined   this only applies if each method marked with  Before has a unique name in the class hierarchy   For example  I had the following   public class AbstractFooTest      Before   public void setUpTest                       public void FooTest extends AbstractFooTest      Before   public void setUpTest                      I expected AbstractFooTest setUpTest   to run before FooTest setUpTest    but only FooTest setupTest   was executed  AbstractFooTest setUpTest   was not called at all    The code must be modified as follows to work   public void FooTest extends AbstractFooTest      Before   public void setUpTest         super setUpTest

[java] What order are the Junit @Before/@After called?

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