Conditionally ignoring tests in JUnit 4

Question

OK  so the  Ignore annotation is good for marking that a test case shouldn t be run   However  sometimes I want to ignore a test based on runtime information   An example might be if I have a concurrency test that needs to be run on a machine with a certain number of cores   If this test were run on a uniprocessor machine  I don t think it would be correct to just pass the test  since it hasn t been run   and it certainly wouldn t be right to fail the test and break the build   So I want to be able to ignore tests at runtime  as this seems like the right outcome  since the test framework will allow the build to pass but record that the tests weren t run    I m fairly sure that the annotation won t give me this flexibility  and suspect that I ll need to manually create the test suite for the class in question   However  the documentation doesn t mention anything about this and looking through the API it s also not clear how this would be done programmatically  i e  how do I programatically create an instance of Test or similar that is equivalent to that created by the  Ignore annotation     If anyone has done something similar in the past  or has a bright idea of how else I could go about this  I d be happy to hear about it

User · Answer

A quick note  Assume assumeTrue condition  ignores rest of the steps but passes the test   To fail the test  use org junit Assert fail   inside the conditional statement  Works same like Assume assumeTrue   but fails the test

User · Answer

In JUnit 4  another option for you may be to create an annotation to denote that the test needs to meet your custom criteria  then extend the default runner with your own and using reflection  base your decision on the custom criteria  It may look something like this   public class CustomRunner extends BlockJUnit4ClassRunner       public CTRunner Class lt   gt  klass  throws initializationError           super klass               Override     protected boolean isIgnored FrameworkMethod child            if shouldIgnore                  return true                    return super isIgnored child              private boolean shouldIgnore class               some custom criteria

User · Answer

You should checkout Junit-ext project   They have RunIf annotation that performs conditional tests  like    Test  RunIf DatabaseIsConnected class  public void calculateTotalSalary           your code there    class DatabaseIsConnected implements Checker      public boolean satisify             return Database connect      null            Code sample taken from their tutorial

User · Answer

The JUnit way is to do this at run-time is org junit Assume     Before  public void beforeMethod          org junit Assume assumeTrue someCondition             rest of setup       You can do it in a  Before method or in the test itself  but not in an  After method  If you do it in the test itself  your  Before method will get run  You can also do it within  BeforeClass to prevent class initialization   An assumption failure causes the test to be ignored   Edit  To compare with the  RunIf annotation from junit-ext  their sample code would look like this    Test public void calculateTotalSalary         assumeThat Database connect    is notNull            test code below      Not to mention that it is much easier to capture and use the connection from the Database connect   method this way

User · Answer

Additionally to the answer of  tkruse and  Yishai  I do this way to conditionally skip test methods especially for Parameterized tests  if a test method should only run for some test data records  public class MyTest          get current test method      Rule public TestName testName   new TestName              Before     public void setUp             org junit Assume assumeTrue new Function lt String  Boolean gt                 Override           public Boolean apply String testMethod                if  testMethod startsWith  quot testMyMethod quot                    return  lt some condition gt                             return true                        apply testName getMethodName                           continue setup

[java] Conditionally ignoring tests in JUnit 4

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