在Calendar.getInstance()模拟上获取NotAMockException

import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

import java.util.Calendar;

@RunWith(PowerMockRunner.class)
@PrepareForTest(Calendar.class)
public class CalendarTest {

    @Test
    public void testGetCalendarInstance() {
        // 模拟Calendar.getInstance()方法的返回值
        Calendar mockedCalendar = Calendar.getInstance();
        mockedCalendar.set(2022, Calendar.JANUARY, 1); // 设置期望的日期和时间

        PowerMockito.mockStatic(Calendar.class);
        PowerMockito.when(Calendar.getInstance()).thenReturn(mockedCalendar);

        // 在测试中使用模拟的Calendar对象
        Calendar calendar = Calendar.getInstance();
        System.out.println(calendar.getTime()); // 输出：Sat Jan 01 00:00:00 GMT 2022
    }
}