Gradle: Execution failed for task ‘:test’. > No tests found for given includes:

I try to run this single unit test of this open-source project on GitHub with IntelliJ.

Execution failed for task ':test'.
No tests found for given includes: [DNAnalyzer.MainTest.mainClassshouldExist](--tests filter)

The test class

package DNAnalyzer;


import org.junit.jupiter.api.Test;

public class MainTest {
  @Test
  public void mainClassshouldExist() throws ClassNotFoundException {
     Class.forName("DNAnalyzer.Main");
  }
}

The build.gradle

/*
 * This file was generated by the Gradle 'init' task.
 *
 * This generated file contains a sample Java application project to get you started.
 * For more details take a look at the 'Building Java & JVM projects' chapter in the Gradle
 * User Manual available at https://docs.gradle.org/7.5.1/userguide/building_java_projects.html
 */

plugins {
    // Apply the application plugin to add support for building a CLI application in Java.
    id 'application'
}

repositories {
    // Use Maven Central for resolving dependencies.
    mavenCentral()
}

dependencies {
    // Use JUnit test framework.
    testImplementation group: 'org.junit.jupiter', name: 'junit-jupiter-api', version: '5.9.1'


    // This dependency is used by the application.
    implementation "com.google.guava:guava:31.0.1-jre"

    // Picocli
    implementation "info.picocli:picocli:4.6.3"
}

application {
    // Define the main class for the application.
    mainClass = "DNAnalyzer.Main"
}

test {
    useJUnitPlatform()
}

jar {
    manifest {
        attributes 'Main-Class': 'DNAnalyzer.Main'
    }

    from {
        configurations.runtimeClasspath.collect { it.isDirectory() ? it : zipTree(it) }
    }
}

What I have tried

• Updating to the newest JUnit

  testImplementation group: ‘org.junit.jupiter’, name: ‘junit-jupiter-api’, version: ‘5.9.1’

• Adding this to my build.gradle file:

  test { useJUnitPlatform() }

The only workaround yet:

When I go to Settings -> Build-Tool -> Gradle and set the Test execution to “Run tests wit: IntelliJ IDEA” the tests are executed correctly.

Thanks

Answer

Problem is coming from the naming of the package which contains your test classes, DNAnalyzer, which does not really follow java naming conventions as it’s starts with/contains capital letters.

When executing single test case or test class, IntelliJ will delegate to Gradle by invoking test task with a specific filter, as follows ./gradlew :test --tests "DNAnalyzer.MainTest.mainClassshouldExist"

And in Gradle there is this issue : https://github.com/gradle/gradle/issues/20350 : “test –tests does not work with packages which contain capital letters”.

Try to move your test classes in another well-named package and you won’t have this issue.