[java] 'No JUnit tests found' in Eclipse

So I'm new to JUnit, and we have to use it for a homework assignment. Our professor gave us a project that has one test class, BallTest.java. When I right click > Run as > JUnit Test, I get a popup error that says 'No JUnit tests found'. I know the question has been answered here(No tests found with test runner 'JUnit 4'), but closing eclipse, restarting, cleaning, and building doesn't seem to work. Below are screenshots of my run configuration, build path, and the class I'm trying to test.

Run Configuration Build Path

BallTest.java

import static org.junit.Assert.*;
import junit.framework.Assert;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.JUnitCore; 
import org.junit.runner.Result; 
import org.junit.runner.notification.Failure; 

public class BallTest {

Ball ball;

/**
 * @throws java.lang.Exception
 */
@Before
public void setUp() throws Exception {
    System.out.println("Setting up ...");
    Point2D p = new Point2D(0,0);
    ball = new Ball(p);
}

/**
 * @throws java.lang.Exception
 */
@After
public void tearDown() throws Exception {
    System.out.println("Tearing down ...");
    ball = null;
}

/**
 * Test method for {@link Ball#getCoordinates()}.
 */
@Test
public void testGetCoordinates() {
    assertNotNull(ball); // don't need Assert. because of the import statement above.
    Assert.assertEquals(ball.getCoordinates().getX(), 0);
    Assert.assertEquals(ball.getCoordinates().getY(), 0);
}

/**
 * Test method for {@link Ball#setCoordinates(Point2D)}.
 */
@Test
public void testSetCoordinates() {
    Assert.assertNotNull(ball);
    Point2D p = new Point2D(99,99);
    ball.setCoordinates(p);
    Assert.assertEquals(ball.getCoordinates().getX(), 99);
    Assert.assertEquals(ball.getCoordinates().getY(), 99);
}

/**
 * Test method for {@link Ball#Ball(Point2D)}.
 */
@Test
public void testBall() {
    Point2D p = new Point2D(49,30);
    ball = new Ball(p);
    Assert.assertNotNull(ball);
    Assert.assertEquals(ball.getCoordinates().getX(), 49);
    Assert.assertEquals(ball.getCoordinates().getY(), 30);

    //fail("Not yet implemented");
}

public static void main (String[] args) {
         Result result = JUnitCore.runClasses(BallTest.class);
         for (Failure failure : result.getFailures()) { 
                System.out.println(failure.toString()); 
            } 
        System.out.println(result.wasSuccessful());  
}

}

This question is related to java eclipse unit-testing junit

The answer is


If none of the other answers work for you, here's what worked for me.

Restart eclipse

I had source folder configured correctly, and unit tests correctly annotated but was still getting "No JUnit tests found", for one project. After a restart it worked. I was using STS 3.6.2 based of eclipse Luna 4.4.1


I had this problem too with JUnit 5.4.2. I use Eclipse 2019-09 with gradle 5.3.1.

So I had to add this two dependencies to build.gradle file with right configuration for it (testImplementation and testRuntimeOnly):

apply plugin: "java"

//enabled the Gradle’s native JUnit 5 support  
test {  
  useJUnitPlatform()  
}  
testImplementation  group: "org.junit.jupiter", name: "junit-jupiter-api", version: "${junitVer}"
testRuntimeOnly group: 'org.junit.jupiter', name: 'junit-jupiter-engine', version: "${junitVer}"

Try this

Right Click on the Unit Test Class,

  1. Select "Run As" -> Run Configuration
  2. In the "Test" tab, make sure in the field "Test runner" select drop down "JUnit 4"
  3. Click "Apply"

Now Run the test!


Some time if lots if Test files are there then Eclipse failed to pass -classpath options for all libs and path due to classpath param lenght limitations. To Solve it go to Run

Configerations -> JUnit -> Your Project Config -> ClassPath -> Check "Use Temporary Jar Options"

At least it solved my problem.


The run configuration for a test class can create another cause (and solution) for this problem.

If you go to Run (or Debug) Configurations (using cmd-3 or clicking on the small dropdown buttons in the toolbar) you can see a configuration created for every test class you've worked with. I found that one of my classes that wouldn't launch had a run configuration where the Test Method field had somehow gotten inadvertently populated. I had to clear that to get it to work. When cleared it shows (all methods) in light text.

I'll add that strangely — maybe there was something else going on — it also seemed not to work for me until I fixed the "Name" field as well so that it included only the class name like the other JUnit run configurations.


Right Click on Project > Properties > Java Build Path > Libraries > select classpath -> add Library -> Junit -> select junit version -> finish -> applay


It looks like you're missing the runner definition on your test class, that could be the cause:

import org.junit.runners.JUnit4;
@RunWith(JUnit4.class)
public class BallTest {
...
}

I think you have created your test classes outside the src folder. You can solve above problem by two way:

  1. Add your package name in java build path->source

  2. Move your package/class in src folder

I have the same problem and solved in this way both solutions working fine.


Any solution didn't work for me until I change the name of the my test method. When name of test method starts with "test" is OK. I am new in android programing and it was for me big surprise.


Sometimes, it occurs when you add Junit Library in Module path. So, Delete it there and add in Class path.


Came across this problem while upgrading projects across eclipse versions. For e.g. junits running well in Mars2.0 did not run on Neon. The following worked for me.

  1. Delete .settings folder. Import project into eclipse.
  2. Remove source folders. Then again use the folders as source folders. e.g - remove src/main/java from build path as source folder. -> Ok -> Again make this folder as source folder. Repeat it for main/resources, test/java, test/resources

The best way to resolve this issue is to put public Access modifier for your Junit Test Case class name and then run the scenario by right click on your Junit test case class and run as Junit Test.


I had the same problem and solved like this: I deleted @Test annotation and retyped it. It just worked, I have no idea why.


In Eclipse Photon you may need to add JUnit 4 or 5 to the build path. Right click @Test and select 'Add JUnit 4 to build path'.


right click -> build path -> remove from build path and then again add it -> Right click on the folder named 'Test' > Build Path > Use as Source Folder.


Click 'Run'->choose your JUnit->in 'Test Runner' select the JUnit version you want to run with.

enter image description here


  1. Right click your project ->Properties->Java Build Path and go to Source Tab then add your test src folder.
  2. Select Project menu and unselect 'Build Automatically' option if selected
  3. Select Clean and then select 'Build Automatically' option
  4. Restart Eclipse and run your junit.

I solved the problem by configuring the build path. Right click on the project(or any of the subfolders)-> Build path -> Configure build path. Once the property window opens up, click on the 'Source' tab and add your src and tst folders. But this alone did not work for me. Strangely, I had to retype the annotations.(Project->clean or restart might also have worked though).


junit4 require that test classname should be use Test as suffix.


I was using @RunWith(Parameterized.class) but missed to add the @Parameters annotation in the public static parameters method. After adding the annotation it worked.


The solution was, after making a backup of the src/test folder, removing it from the filesystem, then creating it again.

That's after I did the "Remove from build path" hint and it screwed the folders when opening the project in STS 4.


Examples related to java

Under what circumstances can I call findViewById with an Options Menu / Action Bar item? How much should a function trust another function How to implement a simple scenario the OO way Two constructors How do I get some variable from another class in Java? this in equals method How to split a string in two and store it in a field How to do perspective fixing? String index out of range: 4 My eclipse won't open, i download the bundle pack it keeps saying error log

Examples related to eclipse

How do I get the command-line for an Eclipse run configuration? My eclipse won't open, i download the bundle pack it keeps saying error log strange error in my Animation Drawable How to uninstall Eclipse? How to resolve Unable to load authentication plugin 'caching_sha2_password' issue Class has been compiled by a more recent version of the Java Environment Eclipse No tests found using JUnit 5 caused by NoClassDefFoundError for LauncherFactory How to downgrade Java from 9 to 8 on a MACOS. Eclipse is not running with Java 9 "The POM for ... is missing, no dependency information available" even though it exists in Maven Repository The origin server did not find a current representation for the target resource or is not willing to disclose that one exists. on deploying to tomcat

Examples related to unit-testing

Deprecated Gradle features were used in this build, making it incompatible with Gradle 5.0 How to test the type of a thrown exception in Jest Unit Tests not discovered in Visual Studio 2017 Class Not Found: Empty Test Suite in IntelliJ Angular 2 Unit Tests: Cannot find name 'describe' Enzyme - How to access and set <input> value? Mocking HttpClient in unit tests Example of Mockito's argumentCaptor How to write unit testing for Angular / TypeScript for private methods with Jasmine Why is the Visual Studio 2015/2017/2019 Test Runner not discovering my xUnit v2 tests

Examples related to junit

Eclipse No tests found using JUnit 5 caused by NoClassDefFoundError for LauncherFactory How to resolve Unneccessary Stubbing exception JUnit 5: How to assert an exception is thrown? How do I mock a REST template exchange? Class Not Found: Empty Test Suite in IntelliJ Unable to find a @SpringBootConfiguration when doing a JpaTest Failed to load ApplicationContext (with annotation) Example of Mockito's argumentCaptor Mockito - NullpointerException when stubbing Method Spring jUnit Testing properties file