如何在Android中模拟DateFormat.is24HourFormat()进行单元测试？

import android.content.Context;
import android.text.format.DateFormat;

import org.junit.Before;
import org.junit.Test;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;

import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.mockito.Mockito.when;

@Mock
private Context mockContext;

@Before
public void setup() {
    MockitoAnnotations.initMocks(this);
}

@Test
public void testIs24HourFormat() {
    // 模拟24小时制的时间格式
    when(mockContext.getString(android.R.string.time_12_24)).thenReturn("24");
    assertTrue(DateFormat.is24HourFormat(mockContext));

    // 模拟12小时制的时间格式
    when(mockContext.getString(android.R.string.time_12_24)).thenReturn("12");
    assertFalse(DateFormat.is24HourFormat(mockContext));
}