No tests found with test runner JUnit 4

Question

My Java test worked well from Eclipse  But now  when I relaunch test from the run menu  I get the following message    No tests found with test runner  JUnit 4    In the  classpath file I have all jar files  and at the end have     lt classpathentry exported  true  kind  con  path  org eclipse jdt junit JUNIT CONTAINER 4   gt       lt classpathentry kind  output  path  bin   gt   lt  classpath gt    How can I resolve this error and get tests running again

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Six years later     and there are still problems with Eclipse and occasionally not finding JUnits   In my Eclipse Mars 2 I discovered that it won t recognise test classes pulled in from git if there are more than 9 or 10  Test annotations in the file  I need to comment out any extra tests  run the test class  then uncomment them and re-run the class  Go figure

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I tried the solution from Germ  n  It worked for all the method from my class but i have a lot of classes in my project   So I tried removing from build path and then re-adding it  It worked perfectly   Hope it helps

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I had to do a mvn clean on command line then project- clean in eclipse  I renamed the class beforehand then renamed it back but i doubt that helped

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I ve had issues with this recently  which seem to be fixed in the latest Eclipse   eclipse-java 4 11 0 2019-03 R - gt  4 12 0 2019-06 R

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Very late but what solved the problem for me was that my test method names all started with captial letters   public void Test   Making the t lower case worked

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I have found out the answer   I got this error when I executed the test standalone from eclipse  right click on the method and choose to run as junit test     When I executed the complete class as junit test the test executed correctly with the parameters

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Try Adding    Test above the method for the test like this   Test public void testParse

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If you are trying to setup junit 5 add  RunWith JUnitPlatform class   and import org junit platform runner JUnitPlatform  so that eclipse can recognize the junit 5 test classes as test classes

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This happened to me as well  I tried restarting Eclipse and also prefixed my test-methods with tests  Neither worked   The following step worked  Change all your test methods present in  BeforeClass and  AfterClass to static methods   i e  if you have your test method in the below format    BeforeClass public void testBeforeClass        then change it to    BeforeClass public static void testBeforeClass        This worked for me

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Add  Test on top of your test  Mouse hover to the annotation  Chose  add junit 4 library to classpath

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There is another chance  you might have changed Junit Test from lower version e g  Junit 3  to Junit 4   Is so follow below steps -  1  Right Click on class 2  Select Run as  gt  gt   Run Configurations  3  Check your  Test Runner  option in new window 4  If it not same as maven change it for example change it as Junit 4

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I found out that Eclipse seems to only perform JUnit 3 style tests if your test-class extends from TestCase  If you remove the inheritance  the annotations worked for me   Beware that you need to statically import all the required assert  methods like import static org junit Assert

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I was facing the same problem and I debugged it to bad examples on the web and internals of junit  Basically don t make your class extend TestCase as some examples show for Junit 4 x  Use some naming convention Test or if you want to have an annotation you can use  RunWith JUnit4 class    If you need access to assert methods extend Assert or use static imports   If your class extends TestCase then even if you use Junit 4 Runner it will be run as 3  This is because in the initialization code there is detection   See JUnit3Builder and the lines   boolean isPre4Test Class lt   gt  testClass        return junit framework TestCase class isAssignableFrom testClass       This returns true and the test for junit4 compatibility won t be tried

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No testsuits in JUnit4  Use annotations instead or use old JUnit3 name conventions   Example    RunWith Suite class   SuiteClasses  YourClassWithTests class

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This happened to me too  I found that in Eclipse I didn t make a new Java Class file and so that s why it wasn t compiling  Try copying your code into a java class file if it s not already there and then compile

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Check for updates   Eclipse is no doubt fully aware of this problem considering how many workarounds have been presented   There is obviously something systemic involved   something that defies explanation or any sense of consistency   It would have been useful if Eclipse would have let the community know what the problem was and how it was fixed  Another recent find for me was to delete any source directories that had no files or the all files were excluded

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In my case the issue was the generics parameters   public class TestClass lt T extends Serializable gt      removing        lt T extends Serializable gt    and the option was available again   I m using Junit4

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Check if the folder your tests are in is a source folder  If not - right click and use as source folder

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May be your JUnit launch configuration was for a individual test class  and you somehow changed that config to  run all tests in a source folder  package or project   But that could trigger the  No tests found with test runner  JUnit 4   error message   Or you did a modification in your test class  removing the  Test annotation  See this wiki page

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In context menu of your  test  directory choose  Build path  -   Use as a source folder   Eclipse should see your unitTests java files as a source files  Warning  No JUnit tests found  occures because there is no unitTests class files in your  build  directory

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Is your Eclipse project maven based  If so  you may need to update the m2eclipse version       Just a quick note  I have a project in   Eclipse which is maven-based  and   generated initially using the  new   maven project  wizard in Eclipse  I m   using JUnit 4 5 for the unit tests    and could quite happily run the tests   from the command line using maven  and   individual tests from Eclipse using   run as JUnit test     However  when I   tried to run all of the tests in the   project by invoking run as JUnit   test    on the project root node    Eclipse complained  no tests found   with test runner junit 4   Solved by   upgrading m2eclipse to the latest   stable development build from the   m2eclipse update site  specifically  I   upgraded from version   0 9 8 200905041414 to version 0 9 9 200907201116 in Eclipse Galileo     From here  http   nuin blogspot com 2009 07 m2eclipse-and-junit4-no-tests-found html

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I also faced this Issue while implementing  RunWith Cucumber class    Since this annotation was inside a Public class and hence Eclipse Shows this  No tests found with test runner not found  error   Once I called   placed the test runner annotation before the runner class  The tests showed up nicely   Readers must identify which Junit Test Runner they are using  One can check with  RunWith JUnit4 class  is Outside or inside the runner class parenthesis     If its inside  Please place it outside

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You might be able to solve this simply by renaming your test class to have a name that ends with Test  e g  ThisAndThatTest

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Using ScalaIDE  3 0 4-2 11-20140723-2253-Typesafe  I was having a similar problem with the Right Click Scala Test Class- gt  Run As - gt  Scala Junit Test context menu   I tried editting the class but not for a compile failure   cleaning  closing the project  closing Eclipse   None of those worked to restore the context menu for classes that had previously worked well   The test classes don t use the  Test annotation and instead use the  RunWith classOf JUnitRunner   annotation at the top of the class using ScalaTest code   When I tried choosing Scala Junit Test from the Run Configuration launch editor directly  I received the dialog from the question   Footix29 s answer was the key for me   I noticed that even though I had cleaned my project a few times  my classes in the  bin directory hadn t actually been rebuilt in a while   Here s how I got back the context menu  and was able to once again run Scala Junit Tests    manually cleaned the classes by deleting the  bin  lt package dir gt   via Explorer Project - gt  Cleaned the project along with a full rebuild   I suspect that a class edit in general is able to clean some saved state of Eclipse and get it going again   In my case all of the previously working classes I tried had failed so the manual clean step was just the hammer I needed   However  other tricks that affect Eclipse s concept of the class path build state should also work   Further  I think that this behaviour was triggered in part by attempting to refactor a Scala class by renaming it  which the Scala Eclipse IDE sucks at    where all the cleanup after the initial file change is manual   There were no build errors  but there were also no warnings that I was expecting meaning something was definitely stuck in Eclipse s build state info

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Right Click the Project -  Build Dependencies -  remove the ones which have been excluded from the build path -  Click OK  Right Click the Project -  Maven -  Update Project   You should be good to go

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You can fix this issue by do as following    Right click on the folder named  Test    Build Path   Use as Source Folder Or you can set classpath same as   lt classpathentry kind  src  path  src test java   gt    You replace  src test java  by your test package   This issue happened because of junit cannot recognize your source code  D

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My problem was that declaration import org junit Test  has disappeared  or wasn t added    After adding it  I had to remove another import declaration  Eclipse ll hint you which one  and everything began to work again

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Check if your test class extends  TestCase   if so  remove that clause  Your class does not need to extend from  TestCase  class  It s most of the cases I ve met    public class MyTestCase extends TestCase     Test   public void checkSomething                       Result gt  AssertionFailedError  No test Found in MyTestCase   Following TestCase should be fine   public class MyTestCase      Test   public void checkSomething                       Works fine

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What fixed my case was similar to  JamesG s answer   I restarted Eclipse  rebuilt the project  and refreshed it  BUT before I did any of that  I 1st closed the project  right-click project in package explorer -  Close Project  and then re-opened it   Then it worked   A workaround solution I found before finding that ultimate solution I just described   Copy the test class  and run the test class as JUnit

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I started to work with Selenium and Eclipse in my job and I was doing my first automated test and I deleted from the code  Before   Test  and  After notes and I was having this issue  No tests found with test runner junit4    My solution it was simply to add again the  Before   Test and  After notes and with that my script worked  Is important to not delete this from the code   This is a simple test that uses Google to search something   import java util regex Pattern  import java util concurrent TimeUnit   import org junit     import static org junit Assert    import static org hamcrest CoreMatchers     import org openqa selenium    import org openqa selenium firefox FirefoxDriver  import org openqa selenium support ui Select   public class TestingClass        private WebDriver driver        Creates an instance of the FirefoxDriver        Before       public void SetUp   throws Exception           driver   new FirefoxDriver                  Test            Search using keyword through Google Search     public void TestTestClass2    throws Exception           driver get  http   www google com mx             driver findElement By name  q    sendKeys  selenium            Thread sleep 10000           driver findElement By name  btnG    click            Thread sleep 10000                Kill all the WebDriver instances        After       public void TearDown   throws Exception           driver quit

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I m also running Eclipse with Maven  m2e 1 4   The tests were running with Maven  but not with Eclipse    even after several application of Maven gt Update project   My solution was to add some lines in the  classpath generated by m2e  The lines are now sticking    lt classpathentry kind  src  output  target test-classes  path  src test java  gt     lt attributes gt       lt attribute name  optional  value  true   gt       lt attribute name  maven pomderived  value  true   gt     lt  attributes gt   lt  classpathentry gt

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Close and open the project worked for me

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When I face this problem I just edit the file and save it    works like charm

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When we get these errors it seems like Eclipse is just confused   Restart Eclipse  refresh the project  clean it  let Eclipse rebuild it  and try again   Most times that works like a charm

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this just happened to me  Rebuilding or restarting Eclipse didn t help   I solved it by renaming one of the test methods to start with  test      JUnit3 style  and then all tests are found  I renamed it back to what it was previously  and it still works

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There are two reasons for this Exception    The source code hasn   t been compiled YET  Or on the contrary  the source code has been compiled BUT it cannot been found by JUnit    For reason one  it has no leg to stand  Because like many people said  the    old    methods work perfectly  Only the new-added methods cannot been identified   Then the second reason became the only explanation  JUnit can NOT find the freshly compiled classes   Having that in mind  I did this  Right click the project - Java Build Path -  Edit Source item  project name src test java   s Output folder  change the Output folder into a    Specific output folder path relative to project name   Provide this value  target test-class   Be hold  This is the default test source codes    output folder defined by Maven  It has been overwrote by M2E  or me   That   s why JUnit cannot find it   So my guess is many people who had run into this lovely exception are most likely dealing with a Web project which is managed by Maven  Am I right   This also contributed my conclusion that reason one should be excluded --    old    methods can be found is because they had been automatically compiled when the Tomcat was  re started  Into the    wrong    path maybe  but JUnit found it anyway   Before I had figured this out  I tried many things as advised  update to the latest JUnit4  Back and forth between build path and use as source folder  capital Test vs test  etc  Nothing happened until I specifically identified the output location for the test source  With all those explanation  my second reason should be re-phrased as this  the new codes had not been timely compiled to the right path   Good luck

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I have this problem from time to time  The thing that resolves the issue most for me is to run the JUnit test from Run configurations    ensuring that JUnit 4 is set as the test runner   Generally  I see this issue when attempting to Run As    Junit test from the context menu on the Package Explorer  If you right click the code for the test you are trying to run and instead of selecting Run As    Junit Test you select Run configurations    ensure the Project  Test Class and test runner are set correctly  clicking apply  then run works all the time for me

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Yet another possible solution I ll throw into the ring  I wasn t able to run the test class either from the editor window  nor the Package Explorer  but right-clicking on the class name in the Outline view and selecting Run As JUnit Test did work    Go figure

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My problem was using        testng      package   org testng Assert    You can replace it in libraries of the project  Maven   with JUnit and then need to refactor project  OR add TestNG Eclipse plug-in    http   testng org doc eclipse html

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I also faced the same issue while running JUnit test  I resolved this by putting the annotation  Test just above the main test function

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I had this issue when my Java class name was similar to the Test class name  Just updated the name of the Test class by post fixing it with keywork  Test  and it started working  Before  Java class   ACMEController Test class   ACMEController  After  Java class   ACMEController Test class   ACMEControllerTest

[java] No tests found with test runner 'JUnit 4'

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