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public class DialogPresenter {
 
    private JDialog dialog;
 
    public void createAndShow(JDialog owner) {
        dialog = new JDialog(owner);
        dialog.setContentPane(new Container());
        dialog.setVisible(true);
    }
}

Java Code:

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import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.CoreMatchers.notNullValue;

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public abstract class AbstractModel {
 
    public void clear() {
        //dummy
    }
}
 
public class ModelA extends AbstractModel { }
public class ModelB extends AbstractModel { }
 
public class UnitUnderTest {
 
    private ModelA modelA;
    private ModelB modelB;
 
    public void doIt() {
        modelA.clear();
        modelB.clear();
    }
}

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private void redirectStdOut() {
    System.setOut(new PrintStream(new LoggerOutputStream(LogFactory.getLog("System.out")), true));
    System.setErr(new PrintStream(new LoggerOutputStream(LogFactory.getLog("System.err")), true));
}
 
static class LoggerOutputStream extends ByteArrayOutputStream {
 
    final private Log logger;
 
    public LoggerOutputStream(Log logger) {
        this.logger = logger;