Eclipse keep saying "No tests found with test runner JUnit 5" - eclipse

Question

I am using Eclipse Oxygen.3 Release (4.7.3). The following is my JUnit test class:
import static org.junit.Assert.assertEquals;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
class MyMathTest {
MyMath myMath = new MyMath();
#Before
public void before() {
System.out.println("Before");
}
#After
public void after() {
System.out.println("After");
}
#Test
public void testSum_with3numbers() {
System.out.println("Test1");
int result = myMath.sum(new int[] {1,2,3});
int expected = 6;
assertEquals(expected, result);
}
#Test
public void testSum_with1numbers() {
System.out.println("Test2");
int result = myMath.sum(new int[] {3});
int expected = 3;
assertEquals(expected, result);
}
#BeforeClass
public static void beforeClass() {
System.out.println("Before class");
}
#AfterClass
public static void afterClass() {
System.out.println("After class");
}
}
When I run this Junit test, eclipse keeps popping up dialog telling "No tests found with test runner 'JUnit 5'". Why?

Answer 1

Your test class is currently based on JUnit 4 since it uses annotations from the org.junit package.
Thus, to get it to run as a JUnit 4 test class in Eclipse, you need to select the JUnit 4 Runner in the "Run Configuration". Click on the tiny arrow (pointing down) next to the green circle with a white arrow in it (at the top of the Eclipse IDE). There you should see your test class, and by selecting that you can switch between the JUnit 4 and JUnit 5 runners.
On the other hand, if your goal is to write a test using JUnit Jupiter (i.e., the programming model for JUnit 5), you'll need to switch from annotations in org.junit to org.junit.jupiter.api.

Answer 2

I had the same error, after trying everything, I have realized that the JUnit library wasn't added. So after adding it, tests worked as intended.

Answer 3

This happened to me because my test method was declared as private and JUnit could not detect it. After I made it public it worked as expected, of course with #Test annotation.

Answer 4

In Eclipse 2019-09 (4.13) is a bug that can cause the "No tests found with test runner 'JUnit 5'" error:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=551298
I added the following dependency to my project and it worked for me:
<dependency>
<groupId>org.junit.platform</groupId>
<artifactId>junit-platform-commons</artifactId>
<version>1.5.2</version><!--$NO-MVN-MAN-VER$-->
<scope>test</scope>
</dependency>

Answer 5

the test class is not public, make it public and it should work

Answer 6

Take a look back to your imports.
You imports import org.junit.Test; (Used for run test cases with JUnit 4)
You need to import import org.junit.jupiter.api.Test; to run tast case with JUnit5.

Answer 7

You are using JUnit 4 annotations with JUnit 5 dependencies.
If you want to use JUnit 5 you should replace:
#Before with #BeforeEach
#After with #AfterEach
#BeforeClass with #BeforeAll
#AfterClass with #AfterAll
#Ignore with #Disabled
Here is more about JUnit 5 annotations https://junit.org/junit5/docs/current/user-guide/#writing-tests-annotations/

Answer 8

Right click the java file and choose:
Build Path -> Configure Build Path -> Java Build Path.
Choose the tab Libraries in Java Build Path, On the right side tab choose Add Library.
Select JUnit and click Next.
Choose JUnit 5 in JUnit Library version dropdown and click finish.
Now run the Test with Junit Test, it will work.
This procedure worked for me.

Answer 9

right click and run as -> config-> make this change and run it will works cheers!!.

Answer 10

My 2 cents:
Right click on project -> Configure -> Add module-info -> Give some random name.
It should automatically add there a requires in the JUnit package, if not, then manually add this:
requires org.junit.jupiter.api;
And it will magically work!
* tested on Eclipse 2018-12

Answer 11

My issue was that, Run works fine, debug throws this error.
I was getting this merely because of low memory in the system. Ideally, eclipse couldn't launch the debug session due to low memory in the system. Error message thrown is confusing.
Hope it helps someone!

Answer 12

In my current case, I encountered this error when testing the pact verification on the Service Provider side.The error was thrown because the Pact Broker doesn't have any pact to test against the Service Provider.
Visit the pact broker and ensure that there is at least one pact to test with.

Answer 13

I had the same problem with an Eclipse (2020-09) non-Maven project. None of the proposed solutions worked, but changing the compiler from 9.0.4 to 15.0.1 did.
I did that by selecting Preferences > Java > Installed JREsand checking the box next to jdk-15.01. You may need to install a recent JDK if none are shown.

Answer 14

Adding the JUnit vintage dependency fixed the issue for me.
https://junit.org/junit5/docs/current/user-guide/#migrating-from-junit4-running
<dependency>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
<scope>test</scope>
</dependency>