Eclipse No tests found using JUnit 5 caused by NoClassDefFoundError for LauncherFactory

I fixed the issue by right clicking the test and selecting 'Run Configurations' and changing the "Test runner:" selection to 'JUnit 4' as shown here:

https://i.stack.imgur.com/oNPRd.png

I ran the test again and it worked.

I have the same issue with STS 3.9.1. It seems like an Eclipse bug, however, to fix this you can add a test dependency junit-platform-launcher to your project (https://mvnrepository.com/artifact/org.junit.platform/junit-platform-launcher)

This is how I did for my project which uses gradle:

dependencies {
    // other stuff here

    testCompile group: 'org.junit.jupiter', name: 'junit-jupiter-engine', version: "5.${junit5MinorVersion}"
    testCompile group: 'org.junit.platform', name: 'junit-platform-launcher', version: "1.${junit5MinorVersion}"
}

gradle.properties file:

junit5MinorVersion=1.0

I believe the same applies if you see this exception while using IntelliJ IDEA.

In my case, the problem was myself and no IDE like Eclipse. I've imported the JUnit 4 Test class.

So do NOT import this one:

import org.junit.Test  // JUnit 4

But DO import that one:

import org.junit.jupiter.api.Test // JUnit 5

SIMPLE FIX: (Add JUnit 5 Library)

INSTRUCTIONS:

Right click on project -> Build Path -> Configure Build Path

In the pop-up -> Add Library -> JUnit -> JUnit 5 -> Finish -> Apply

You should see the JUnit 5 Library (and its jars) added to your project

Right click on project -> Maven -> Update Project -> OK

You ran into Eclipse bug 525948 which has already been fixed and which will be published in the upcoming release Oxygen.3 (4.7.3), March 21, 2018.

As workaround, put your test code in a separate project and add the project under test to the modulepath, but do not add a module-info.java to your test project. With your project, class and module naming, it should look something like this:

https://i.stack.imgur.com/NBXME.png

See also my video that shows Java 9 and JUnit 5 in Eclipse Oxygen.1a in action

Answers so far did not adress the problem of sharing code with other people who don't necessarily use Eclipse. Here is one proposition. The key is to use a maven profile to solve the Eclipse Case.

It assumes you have defined a property junit5.version in your pom like:

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <junit5.version>5.1.1</junit5.version>
</properties>

then in the profiles section add the following:

<profiles>
    <profile>
        <id>eclipse</id>
        <dependencies>
            <dependency>
                <groupId>org.junit.jupiter</groupId>
                <artifactId>junit-jupiter-engine</artifactId>
            </dependency>
            <dependency>
                <groupId>org.junit.platform</groupId>
                <artifactId>junit-platform-launcher</artifactId>
            </dependency>
        </dependencies>
        <dependencyManagement>
            <dependencies>
                <dependency>
                    <groupId>org.junit.jupiter</groupId>
                    <artifactId>junit-jupiter-engine</artifactId>
                    <version>${junit5.version}</version>
                    <scope>test</scope>
                </dependency>
                <dependency>
                    <groupId>org.junit.platform</groupId>
                    <artifactId>junit-platform-launcher</artifactId>
                    <version>1.1.1</version>
                    <scope>test</scope>
                </dependency>
            </dependencies>
        </dependencyManagement>
    </profile>
</profiles>

All you have to do after this is to select the profile in your local Eclipse: Right click on your project and select Maven > Select Maven Profiles... (or hit Ctrl + Alt + P), and then check the "eclipse" profile we just created.

https://i.stack.imgur.com/9PFFU.png

With that you are done. Your Eclipse will run Junit 5 tests as expected, but the configuration you added won't pollute other builds or other IDE

Adding this maven dependency with JUnit Jupiter (v.5.5.1) solves the issue.

<dependency>
    <groupId>org.junit.platform</groupId>
    <artifactId>junit-platform-launcher</artifactId>
    <version>1.5.1</version>
    <scope>test</scope>
</dependency>

FYI, another cause of "No tests found using junit5" is (inadvertently or intentionally) declaring the test cases "private":

// Example of test case that doesn't get included
@Test
private void testSomeMethod() {
}

They need to be public.

None of the solutions helped:

The problem is that Eclipse 2018-12 has support for JUnit 5.3.1. If you start it with a version before that, it will fail.

So make sure you use at least 5.3.1.

5.4.0 does work too.

In case your parent pom is Spring Boot, you need to make sure (in dependency management) that junit-jupiter-api is set to the same version. You don't need junit-platform-runner or -launcher!

Following Andrii Karaivanskyi's answer here's the Maven POM declaration:

<properties>
    ...
    <junit-jupiter.version>5.2.0</junit-jupiter.version>
    <junit-platform.version>1.2.0</junit-platform.version>
    ...
</properties>

<dependencies>
    ...
    <dependency>
        <groupId>org.junit.jupiter</groupId>
        <artifactId>junit-jupiter-engine</artifactId>
        <version>${junit-jupiter.version}</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.junit.platform</groupId>
        <artifactId>junit-platform-launcher</artifactId>
        <version>${junit-platform.version}</version>
        <scope>test</scope>
    </dependency>
    ...
</dependencies>

UPDATE

As per comment by Alexander Wessel you can use org.junit:junit-bom as described in his answer to question Eclipse No tests found using JUnit 5 caused by NoClassDefFoundError for LauncherFactory.

I use actually spring-tool-suite-4-4.5.1 and I had this bug when I want run a test class. and the solution was to add to 'java build path', 'junit5' in Libraries

https://i.stack.imgur.com/4Vnjm.png

I also faced the same issue you just need to add the library , Junit Library is already provided along with Eclipse so you just need to follow below

Build Path > Configure Build Path > library > Add library > JUnit > Next > finish

It works for me

From the start the error message tell you that class is not found : NoClassDefFoundError that mean the PATH to junit is the problem.

Press right click to project folder and choose Properties OR select project folder and press combination cmd + i. select from list "Java Build Path". select "Libraries" tab If JUnit 5(or JUnit 4) is added to "Modulepath", select the "JUnit 5" and press Remove. select "Classpath", press "Add Library...". from opened "Add Library" window, select JUnit, press next. Select JUnit library version that you need and press Finish.

That is all. Try to run test again.

replace:

import org.junit.Test;

with:

import org.junit.jupiter.api.Test;

I got the same problem after creating a new TestCase: Eclipse -> New -> JUnit Test Case. It creates a class without access level modifier. I could solve the problem by just putting a public before the class keyword.

As everyone informed it's IDE bug, I tried in Eclipse and STS. In both the cases, it is failing.

As a workaround, I have fixed by modifying the pom.xml file like below.

I have added these two maven dependencies junit-jupiter-engine and junit-platform-launcher.

pom.xml

<!-- https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-engine -->
    <dependency>
        <groupId>org.junit.jupiter</groupId>
        <artifactId>junit-jupiter-engine</artifactId>
        <version>${junit-jupiter.version}</version>
        <scope>test</scope>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.junit.platform/junit-platform launcher -->
    <dependency>
        <groupId>org.junit.platform</groupId>
        <artifactId>junit-platform-launcher</artifactId>
        <version>${junit-platform.version}</version>
        <scope>test</scope>
    </dependency>
</dependencies>

Also please make sure to add the version of both the maven dependencies in the properties tag.

<properties>
    <java.version>1.8</java.version>
    <junit-jupiter.version>5.2.0</junit-jupiter.version>
    <junit-platform.version>1.2.0</junit-platform.version>
</properties>

you should know that :

@Before from junit4 goes with @Test : "import org.junit.Test"

AND

@BeforeEach from Junit5 goes with : "import org.junit.jupiter.api.Test"

so make sure you are using the imports from the same version of Junit , otherwise it w'ont Work I guess.

@Test annotation must be imported from org.junit.jupiter.api.Test so the Junit5 can read it. Junit4 use @Test annotations imported from org.junit.Test package.

Using STS 3.9.1 I got the same problem. However, currently I do not require any new JUnit5 features, so I tried to force using an older version. If using maven, you can add following dependencies to your pom.xml:

<dependency>
    <groupId>org.junit.platform</groupId>
    <artifactId>junit-platform-launcher</artifactId>
    <version>${junit.platform.version}</version>
    <scope>test</scope>
</dependency>

<dependency>
    <groupId>org.junit.jupiter</groupId>
    <artifactId>junit-jupiter-engine</artifactId>
    <version>${junit.jupiter.version}</version>
    <scope>test</scope>
</dependency>

<dependency>
    <groupId>org.junit.vintage</groupId>
    <artifactId>junit-vintage-engine</artifactId>
    <version>${junit.vintage.version}</version>
    <scope>test</scope>
</dependency>

This did the trick for me (at least as long as I do not need JUnit5 explicitly).

I am using eclipse 2019-09.

I had to update the junit-bom version to at least 5.4.0. I previously had 5.3.1 and that caused the same symptoms of the OP.

My config is now:

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.junit</groupId>
                <artifactId>junit-bom</artifactId>
                <version>5.5.2</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

You are missing JUnit 5 platform launcher with group: 'org.junit.platform', name: 'junit-platform-launcher'

Just add in ur POM:

<dependency>
       <groupId>org.junit.platform</groupId>
       <artifactId>junit-platform-launcher</artifactId>
    </dependency>

Since it's not possible to post code blocks into comments here's the POM template I am using in projects requiring JUnit 5. This allows to build and "Run as JUnit Test" in Eclipse and building the project with plain Maven.

<project
    xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>group</groupId>
    <artifactId>project</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>project name</name>

    <dependencyManagement>
      <dependencies>
        <dependency>
        <groupId>org.junit</groupId>
        <artifactId>junit-bom</artifactId>
        <version>5.3.1</version>
        <type>pom</type>
        <scope>import</scope>
        </dependency>
      </dependencies>
    </dependencyManagement>

    <dependencies>
      <dependency>
        <groupId>org.junit.jupiter</groupId>
        <artifactId>junit-jupiter-engine</artifactId>
        <scope>test</scope>
      </dependency>

      <dependency>
        <groupId>org.junit.platform</groupId>
        <artifactId>junit-platform-launcher</artifactId>
        <scope>test</scope>
      </dependency>

      <dependency>
        <!-- only required when using parameterized tests -->
        <groupId>org.junit.jupiter</groupId>
        <artifactId>junit-jupiter-params</artifactId>
        <scope>test</scope>
      </dependency>
    </dependencies>
</project>

You can see that now you only have to update the version in one place if you want to update JUnit. Also the platform version number does not need to appear (in a compatible version) anywhere in your POM, it's automatically managed via the junit-bom import.

You can use only junit-jupiter as a test dependency instead of junit-jupiter-api, junit-platform-launcher, junit-jupiter-engine.

<dependency>
    <groupId>org.junit.jupiter</groupId>
    <artifactId>junit-jupiter</artifactId>
    <version>5.5.2</version>
    <scope>test</scope>
</dependency>

I'm using:

Spring Tool Suite 4 Version: 4.4.2.RELEASE Build Id: 201911201053 Java version: 1.8.0_191

and the message displayed is No tests found with test runner 'JUnit5'

what worked for me was the configuration below

    <properties>
        <java.version>1.8</java.version>
        <junit-jupiter.version>5.5.2</junit-jupiter.version>
        <junit-platform.version>1.5.2</junit-platform.version>
    </properties> 

    <dependency>
        <groupId>org.junit.jupiter</groupId>
        <artifactId>junit-jupiter-engine</artifactId>
        <version>${junit-jupiter.version}</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.junit.platform</groupId>
        <artifactId>junit-platform-launcher</artifactId>
        <version>${junit-platform.version}</version>
        <scope>test</scope>
    </dependency>

You might be importing @Test from org.junit.Test, which is a JUnit 4 annotation. The Junit5 test runner will not discover it.

The Junit5 test runner will discover a test annotated with org.junit.jupiter.api.Test

Found the answer from Import org.junit.Test throws error as "No Test found with Test Runner "JUnit 5""

You should make sure your test case function is public rather than private to make it accessible by Test Runner.

@Test
private void testmethod(){}

to

@Test
public void testmethod(){}

Same error i faced in eclipse version Oxygen.3a Release (4.7.3a) . There is issue in Maven Dependencies mismatch.To solve i have updated my Pom.xml with following dependecies.

http://maven.apache.org/xsd/maven-4.0.0.xsd"> 4.0.0 com.netapp.junitnmactiopractice JunitAndMactioPractice 0.0.1-SNAPSHOT

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <java.version>1.8</java.version>
    <junit.jupiter.version>5.1.1</junit.jupiter.version>
    <junit.platform.version>1.1.1</junit.platform.version>
</properties>

<build>
    <plugins>
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.1</version>
            <configuration>
                <source>${java.version}</source>
                <target>${java.version}</target>
            </configuration>
        </plugin>
    </plugins>
</build>

<dependencies>
    <dependency>
        <groupId>org.junit.jupiter</groupId>
        <artifactId>junit-jupiter-engine</artifactId>
        <version>${junit.jupiter.version}</version>
    </dependency>
    <dependency>
        <groupId>org.junit.platform</groupId>
        <artifactId>junit-platform-runner</artifactId>
        <version>${junit.platform.version}</version>
        <scope>test</scope>
    </dependency>
</dependencies>

you should change

@Test
public static void testmethod(){}

to

@Test
public void testmethod(){}

the @Test is unsupport static method

For me, I configured the build path to add JUnit 5 Library and also by adding the dependency

     <dependency> 
        <groupId>org.junit.platform</groupId> 
        <artifactId>junit-platform-launcher</artifactId> 
        <version>1.1.0</version> 
        <scope>test</scope> 
     </dependency>

seperately.

I faced this issue with Eclipse (Version: 2019-12 (4.14.0)) too. The solution seems either to use IntelliJ or to use the Maven test to run such tests in Eclipse.