<dependency>
    <groupId>org.uispec4j</groupId>
    <artifactId>uispec4j</artifactId>
    <version>2.4</version>
    <scope>test</scope>
</dependency>

public class Main
{
    public static void main(String[] args)
    {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                MainWindow window = new MainWindow();
                window.setLocationRelativeTo(null);
                window.setVisible(true);
            }
        });
    }
}

public class CanFillInABasicFormTest extends UISpecTestCase
{
    @BeforeClass
    public void setUp() {
        setAdapter(new MainClassAdapter(Main.class, new String[0]));
    }

    @Test
    public void test()
    {
        Window mainWindow = getMainWindow();
    }
}

java.lang.AbstractMethodError: org.uispec4j.interception.toolkit.UISpecToolkit.createKeyboardFocusManagerPeer(Ljava/awt/KeyboardFocusManager;)Ljava/awt/peer/KeyboardFocusManagerPeer;
    at java.awt.KeyboardFocusManager.initPeer(Unknown Source)
    at java.awt.KeyboardFocusManager.<init>(Unknown Source)
    at java.awt.DefaultKeyboardFocusManager.<init>(Unknown Source)
    at java.awt.KeyboardFocusManager.getCurrentKeyboardFocusManager(Unknown Source)
    at java.awt.KeyboardFocusManager.getCurrentKeyboardFocusManager(Unknown Source)
    at javax.swing.UIManager.initialize(Unknown Source)
    at javax.swing.UIManager.maybeInitialize(Unknown Source)
    at javax.swing.UIManager.getDefaults(Unknown Source)
    at javax.swing.UIManager.put(Unknown Source)
    at org.uispec4j.interception.ui.UISpecLF.init(UISpecLF.java:11)
    at org.uispec4j.UISpec4J.init(UISpec4J.java:32)
    at org.uispec4j.UISpecTestCase.<clinit>(UISpecTestCase.java:31)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at junit.framework.TestSuite.createTest(TestSuite.java:61)
    at junit.framework.TestSuite.addTestMethod(TestSuite.java:294)
    at junit.framework.TestSuite.addTestsFromTestCase(TestSuite.java:150)
    at junit.framework.TestSuite.<init>(TestSuite.java:129)
    at org.junit.internal.runners.JUnit38ClassRunner.<init>(JUnit38ClassRunner.java:71)
    at org.junit.internal.builders.JUnit3Builder.runnerForClass(JUnit3Builder.java:14)
    at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)
    at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:29)
    at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)
    at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:24)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.<init>(JUnit4TestReference.java:33)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestClassReference.<init>(JUnit4TestClassReference.java:25)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:48)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:452)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

public class CanFillInABasicFormTest extends UISpecTestCase {
    public void setUp() {
        setAdapter(new MainClassAdapter(Main.class, new String[0]));
    }

    public void test() {
        Window mainWindow = getMainWindow();
    }
}