@Test
    public void canAddTaskToProject() {
        Project project = ProjectBuilder.builder().build();
        Task task = project.task(Collections.singletonMap("type", GreetingTask.class), "name");
        assertTrue(task instanceof GreetingTask);
    }

    @Test
    public void canAddTaskToProject() {
        Project project = ProjectBuilder.builder().build();
        Task task = project.task(Collections.singletonMap("type", GreetingTask.class), "name");
        assertTrue(task instanceof GreetingTask);
    }

        GreetingExtension extension = project.getExtensions().create("greeting", GreetingExtension.class);
        extension.getWho().convention("mate");
        TaskProvider<GreetingTask> task = project.getTasks().register("greeting", GreetingTask.class, t -> {
            t.getWho().convention(extension.getWho());
        });
    }

        GreetingExtension extension = project.getExtensions().create("greeting", GreetingExtension.class);
        extension.getWho().convention("mate");
        TaskProvider<GreetingTask> task = project.getTasks().register("greeting", GreetingTask.class, t -> {
            t.getWho().convention(extension.getWho());
        });
    }

class GreetingTaskTest {
    @Test
    void canAddTaskToProject() {
        Project project = ProjectBuilder.builder().build()
        def task = project.task('greeting', type: GreetingTask)
        assertTrue(task instanceof GreetingTask)
    }

// end::convention[]

// Create a greeting task
abstract class GreetingTask extends DefaultTask {
    @Input
    abstract Property<String> getMessage()

    @TaskAction
    void greet() {
        println("Message: ${message.get()}")
    }
}

// Register the task and set the convention
tasks.register("hello", GreetingTask) {
    message.convention(extension.message)
}
// end::task[]

// end::convention[]

// Create a greeting task
abstract class GreetingTask : DefaultTask() {
    @Input
    val message = project.objects.property<String>()

    @TaskAction
    fun greet() {
        println("Message: ${message.get()}")
    }
}

// Register the task and set the convention
tasks.register<GreetingTask>("hello") {
    message.convention(extension.message)
}
// end::task[]

tasks.register<com.example.GreetingTask>("greet") {
    greeting = "Hello from 'myproject.greeting' plugin"

import org.gradle.api.Project;
import org.gradle.api.Plugin;

public class GreetingPlugin implements Plugin<Project> {

    @Override
    public void apply(Project target) {
        target.getTasks().register("hello", GreetingTask.class);
    }

hello from GreetingTask...