test/jdk/java/awt/Desktop/DesktopEventsExceptions/DesktopEventsExceptions.java

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import java.awt.Desktop;
import java.awt.GraphicsEnvironment;
import java.awt.HeadlessException;
import java.awt.desktop.AboutEvent;
import java.awt.desktop.AppForegroundEvent;
import java.awt.desktop.AppHiddenEvent;
import java.awt.desktop.AppReopenedEvent;
import java.awt.desktop.OpenFilesEvent;
import java.awt.desktop.OpenURIEvent;
import java.awt.desktop.PreferencesEvent;
import java.awt.desktop.PrintFilesEvent;
import java.awt.desktop.QuitEvent;
import java.awt.desktop.ScreenSleepEvent;
import java.awt.desktop.SystemSleepEvent;
import java.awt.desktop.UserSessionEvent;
import java.awt.desktop.UserSessionEvent.Reason;
import java.io.File;
import java.util.Collections;
import java.util.List;

/**
 * @test
 * @bug 8203224
 * @summary tests that the correct exceptions are thrown by the events classes
 *          in {@code java.awt.desktop} package
 * @run main/othervm DesktopEventsExceptions
 * @run main/othervm -Djava.awt.headless=true DesktopEventsExceptions
 */
public final class DesktopEventsExceptions {

    public static void main(final String[] args) {
        // Each element of the list will creates one object to test
        final List<Runnable> constructors = List.of(
                AboutEvent::new,
                AppForegroundEvent::new,
                AppHiddenEvent::new,
                AppReopenedEvent::new,
                QuitEvent::new,
                ScreenSleepEvent::new,
                SystemSleepEvent::new,
                PreferencesEvent::new,
                () -> new PrintFilesEvent(Collections.emptyList()),
                () -> new UserSessionEvent(Reason.UNSPECIFIED),
                () -> new OpenFilesEvent(Collections.emptyList(), ""),
                () -> new OpenURIEvent(new File("").toURI())
        );

        for (final Runnable test : constructors) {
            try {
                test.run();
                checkHeadless(true);
                checkSupported(true);
            } catch (HeadlessException ex) {
                checkHeadless(false);
            } catch (UnsupportedOperationException ex) {
                checkSupported(false);
            }
        }
    }

    private static void checkSupported(final boolean isSupported) {
        if (isSupported != Desktop.isDesktopSupported()) {
            throw new RuntimeException();
        }
    }

    private static void checkHeadless(final boolean isHeadless) {
        if (isHeadless == GraphicsEnvironment.isHeadless()) {
            throw new RuntimeException();
        }
    }
}