test/jdk/java/awt/TextArea/TextScrollTest.java

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import java.awt.BorderLayout;
import java.awt.Frame;
import java.awt.Panel;
import java.awt.TextArea;

/*
 * @test
 * @bug 4127272
 * @summary TextArea displays head of text when scrolling horizontal bar.
 * @library /java/awt/regtesthelpers
 * @build PassFailJFrame
 * @run main/manual TextScrollTest
 */

public class TextScrollTest extends Frame {
    private static final String INSTRUCTIONS = """
            1. A TextArea whose content starts with the text ",
               'Scroll till the' will appear on the window ",
            2. Use the Horizontal thumb button of the TextArea to view the entire",
               content of the TextArea",
            3. While scrolling, if the text 'Scroll till the' appears repeatedly, Click Fail  ",
               else Click Pass"
            """;

    public static void main(String[] args) throws Exception {
        PassFailJFrame.builder()
                .title("TextScrollTest")
                .instructions(INSTRUCTIONS)
                .columns(40)
                .testUI(TextScrollTest::new)
                .build()
                .awaitAndCheck();
    }

    public TextScrollTest() {
        this.setLayout(new BorderLayout());

        Panel p = new Panel();
        TextArea ta = new TextArea("Scroll till the right end of the " +
                "TextArea is reached. Action Done?\n", 10, 20);

        p.add(ta);
        add("Center", p);
        setSize(200, 200);
    }
}