import java.util.Collections;
import java.util.List;

@ServiceScope(Scope.Global.class)
public class InitBuiltInCommand implements BuiltInCommand {
    @Override
    public List<String> asDefaultTask() {
        return Collections.emptyList();
    }

    @Override
    public boolean commandLineMatches(List<String> taskNames) {
        return taskNames.size() > 0 && taskNames.get(0).equals("init");
    }

import java.util.Collections;
import java.util.List;

@ServiceScope(Scope.Global.class)
public class HelpBuiltInCommand implements BuiltInCommand {
    @Override
    public List<String> asDefaultTask() {
        return Collections.singletonList(ProjectInternal.HELP_TASK);
    }

    @Override
    public boolean commandLineMatches(List<String> taskNames) {

            if (defaultTasks.size() == 0) {
                defaultTasks = new ArrayList<>();
                for (BuiltInCommand command : builtInCommands) {
                    defaultTasks.addAll(command.asDefaultTask());
                }
                LOGGER.info("No tasks specified. Using default task {}", GUtil.toString(defaultTasks));
            } else {

public interface BuiltInCommand {
    /**
     * Returns the list of task paths that should be used when none are specified by the user. Returns an empty list if this command should not be used as a default.
     */
    List<String> asDefaultTask();

    /**
     * Does the given list of task paths reference this command?
     */
    boolean commandLineMatches(List<String> taskNames);

        given:
        _ * startParameter.taskRequests >> [new RunDefaultTasksExecutionRequest()]
        _ * defaultProject.defaultTasks >> []
        _ * buildInCommand.asDefaultTask() >> ['default1', 'default2']

        when:
        action.scheduleRequestedTasks(gradle, selector, plan)

        then:
        1 * startParameter.setTaskNames(['default1', 'default2'])

    }

    private String examplePaths() {
        for (BuiltInCommand command : commands) {
            if (command.asDefaultTask().isEmpty()) {
                continue;
            }
            String task = command.asDefaultTask().get(0);
            return String.format("':%s' or '%s'", task, task);
        }
        throw new IllegalStateException("No built-in tasks available.");
    }