nicholas@mordor:~/NetBeansProjects/testng_gradle/app$ 
nicholas@mordor:~/NetBeansProjects/testng_gradle/app$ gradle clean test --tests testing_gradle.AppTest
> Task :app:test FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:test'.
> No tests found for given includes: [testing_gradle.AppTest](--tests filter)

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

Deprecated Gradle features were used in this build, making it incompatible with Gradle 8.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/7.0.2/userguide/command_line_interface.html#sec:command_line_warnings

BUILD FAILED in 771ms
4 actionable tasks: 4 executed
nicholas@mordor:~/NetBeansProjects/testng_gradle/app$ 
nicholas@mordor:~/NetBeansProjects/testng_gradle/app$ gradle clean

Deprecated Gradle features were used in this build, making it incompatible with Gradle 8.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/7.0.2/userguide/command_line_interface.html#sec:command_line_warnings

BUILD SUCCESSFUL in 663ms
1 actionable task: 1 executed
nicholas@mordor:~/NetBeansProjects/testng_gradle/app$ 
nicholas@mordor:~/NetBeansProjects/testng_gradle/app$ tree
.
├── build.gradle
└── src
    ├── main
    │   ├── java
    │   │   └── testng_gradle
    │   │       └── App.java
    │   └── resources
    └── test
        ├── java
        │   └── testng_gradle
        │       └── AppTest.java
        └── resources

9 directories, 3 files
nicholas@mordor:~/NetBeansProjects/testng_gradle/app$ 
nicholas@mordor:~/NetBeansProjects/testng_gradle/app$ cat 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/7.0.2/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()
    mavenLocal()
    jcenter()
}

dependencies {
    // Use TestNG framework, also requires calling test.useTestNG() below
    //compile 'org.testng:testng:7.3.0'
    testImplementation 'org.testng:testng:7.3.0'

    // This dependency is used by the application.
    implementation 'com.google.guava:guava:30.0-jre'
}

application {
    // Define the main class for the application.
    mainClass = 'testng_gradle.App'
}




tasks.named('test') {
    useTestNG() {
        includeGroups 'smoke', 'sanity'
        excludeGroups 'regression'
        testLogging.showStandardStreams = true
	suiteXmlBuilder().suite(name: 'Sample Suite') {
            test(name : 'Sample Test') {
                classes('') {
			'class'(name: 'testing_gradle.AppTest')
                }
            }
	}

    }
}




nicholas@mordor:~/NetBeansProjects/testng_gradle/app$ 
nicholas@mordor:~/NetBeansProjects/testng_gradle/app$ cat src/test/java/testng_gradle/AppTest.java 
/*
 * This Java source file was generated by the Gradle 'init' task.
 */
package testng_gradle;

import org.testng.annotations.*;
import static org.testng.Assert.*;

public class AppTest {
    @Test public void appHasAGreeting() {
        App classUnderTest = new App();
        assertNotNull(classUnderTest.getGreeting(), "app should have a greeting");
    }
}
nicholas@mordor:~/NetBeansProjects/testng_gradle/app$