Junit - run set up method once

Question

I set up a class with a couple of tests and rather than using  Before I would like to have a setup method that executes only once before all tests  Is that possible with Junit 4 8

User · Answer

You can use the BeforeClass annotation    BeforeClass public static void setUpClass           executed only once  before the first test

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Edit  I just found out while debugging that the class is instantiated before every test too  I guess the  BeforeClass annotation is the best here   You can set up on the constructor too  the test class is a class after all  I m not sure if it s a bad practice because almost all other methods are annotated  but it works  You could create a constructor like that   public UT             initialize once here    Test    Some test here      The ctor will be called before the tests because they are not static

User · Answer

Although I agree with  assylias that using  BeforeClass is a classic solution it is not always convenient  The method annotated with  BeforeClass must be static  It is very inconvenient for some tests that need instance of test case  For example Spring based tests that use  Autowired to work with services defined in spring context  In this case I personally use regular setUp   method annotated with  Before annotation and manage my custom static     boolean flag  private static boolean setUpIsDone   false         Before public void setUp         if  setUpIsDone            return               do the setup     setUpIsDone   true

User · Answer

Try this solution  https   stackoverflow com a 46274919 907576    with  BeforeAllMethods  AfterAllMethods annotation you could execute any method in Test class in an instance context  where all injected values are available

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JUnit 5 now has a  BeforeAll annotation      Denotes that the annotated method should be executed before all  Test   methods in the current class or class hierarchy  analogous to JUnit   4   s  BeforeClass  Such methods must be static    The lifecycle annotations of JUnit 5 seem to have finally gotten it right   You can guess which annotations available without even looking  e g   BeforeEach  AfterAll

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I solved this problem like this   Add to your Base abstract class  I mean abstract class where you initialize your driver in setUpDriver   method  this part of code   private static boolean started   false  static      if   started            started   true          try               setUpDriver       method where you initialize your driver           catch  MalformedURLException e                        And now  if your test classes will extends from Base abstract class -  setUpDriver   method will be executed before first  Test only ONE time per run

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If you don t want to force a declaration of a variable that is set and checked on each subtest  then adding this to a SuperTest could do    public abstract class SuperTest        private static final ConcurrentHashMap lt Class  Boolean gt  INITIALIZED   new ConcurrentHashMap lt  gt         protected final boolean initialized             final boolean   absent    false           INITIALIZED computeIfAbsent this getClass     klass - gt                return absent 0    true                      return  absent 0              public class SubTest extends SuperTest        Before     public void before             if   super initialized     return                magic

User · Answer

Use Spring s  PostConstruct method to do all initialization work and this method runs before any of the  Test is executed

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When setUp   is in a superclass of the test class  e g  AbstractTestBase below   the accepted answer can be modified as follows  public abstract class AbstractTestBase       private static Class lt   extends AbstractTestBase gt  testClass                public void setUp             if  this getClass   equals testClass                 return                        do the setup - once per concrete test class                       testClass   this getClass             This should work for a single non-static setUp   method but I m unable to produce an equivalent for tearDown   without straying into a world of complex reflection    Bounty points to anyone who can

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My dirty solution is   public class TestCaseExtended extends TestCase        private boolean isInitialized   false      private int serId        Override     public void setUp   throws Exception           super setUp            if  isInitialized                loadSaveNewSerId                emptyTestResultsDirectory                isInitialized   true                               I use it as a base base to all my testCases

User · Answer

JUnit 5  BeforeAll can be non static provided the lifecycle of the test class is per class  i e   annotate the test class with a  TestInstance Lifecycle PER CLASS  and you are good to go

[java] Junit - run set up method once

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