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import java.awt.Frame;
import java.awt.TextArea;

/*
 * @test
 * @bug 4118915
 * @summary Test appending to a TextArea after the peer is created
 * @library /java/awt/regtesthelpers
 * @build PassFailJFrame
 * @run main/manual TextAreaAppendTest
 */

public class TextAreaAppendTest {
    private static final String INSTRUCTIONS = """
            If all four lines are visible in TextArea, the test passed.
            If the last two lines have only one character visible, the test failed.
            """;

    public static void main(String[] args) throws Exception {
        PassFailJFrame.builder()
                .title("TextAreaAppendTest")
                .instructions(INSTRUCTIONS)
                .rows((int) INSTRUCTIONS.lines().count() + 2)
                .columns(40)
                .testUI(TextAreaAppendTest::createGUI)
                .build()
                .awaitAndCheck();
    }

    public static Frame createGUI() {
        Frame f = new Frame("TextAreaAppendTest");
        TextArea ta = new TextArea();
        f.add(ta);
        ta.append("line 1 (added before drawing)\n");
        ta.append("line 2 (added before drawing)\n");

        f.pack();
        f.show();

        ta.append("line 3 (added after drawing)\n");
        ta.append("line 4 (added after drawing)\n");

        return f;
    }
}