Unittest to verify that static method is called - PowerMock, Mockito, TestNG

VerifyStaticCallTest.java

package abc;

import static org.mockito.Matchers.any;
import static org.mockito.Matchers.eq;

import java.awt.Component;

import javax.swing.JOptionPane;

import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.testng.PowerMockTestCase;
import org.testng.annotations.Test;

class MessageBox {
    public void showErrorMessage(String msg) {
        JOptionPane.showMessageDialog(null, msg, "Bar", JOptionPane.ERROR_MESSAGE);
    }
}

@PrepareForTest(JOptionPane.class)
public class VerifyStaticCallTest extends PowerMockTestCase {

    /**
     * Unittest to verify that static method is called with the specified parameter.
     */
    @Test
    public void showErrorMessage() {
        String msg = "foo";

        PowerMockito.mockStatic(JOptionPane.class);

        MessageBox cut = new MessageBox();
        cut.showErrorMessage(msg);

        PowerMockito.verifyStatic();
        JOptionPane.showMessageDialog(any(Component.class), 
                                      eq(msg), 
                                      any(String.class), 
                                      eq(JOptionPane.ERROR_MESSAGE));
    }

}