使用AssertJ在测试中获取JSlider值

import org.assertj.swing.edt.GuiActionRunner;
import org.assertj.swing.edt.GuiQuery;
import org.assertj.swing.fixture.FrameFixture;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import javax.swing.JFrame;
import javax.swing.JSlider;

import static org.assertj.core.api.Assertions.assertThat;

public class JSliderTest {
    private FrameFixture frame;

    @Before
    public void setUp() {
        JFrame window = GuiActionRunner.execute(new GuiQuery<JFrame>() {
            protected JFrame executeInEDT() {
                return new JFrame();
            }
        });
        JSlider slider = GuiActionRunner.execute(new GuiQuery<JSlider>() {
            protected JSlider executeInEDT() {
                return new JSlider();
            }
        });
        window.add(slider);
        frame = new FrameFixture(window);
        frame.show();
    }

    @After
    public void tearDown() {
        frame.cleanUp();
    }

    @Test
    public void testJSliderValue() {
        int expectedValue = 50;
        JSlider slider = frame.slider();
        int actualValue = slider.getValue();
        assertThat(actualValue).isEqualTo(expectedValue);
    }
}