How to mock static methods using PowerMockito

WebUtilsTest.java

package com.bjpeter.sampleapp.utils;

import com.bjpeter.sampleapp.services.ServiceLoader;
import com.bjpeter.sampleapp.services.TextService;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mockito;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

@RunWith(PowerMockRunner.class)
@PrepareForTest(ServiceLoader.class)
public class WebUtilsTest {

  @Test
  public void testSafeReturnUri() {
    // Set up mocks.
    PowerMockito.mockStatic(ServiceLoader.class);
    TextService service = Mockito.mock(TextService.class);
    Mockito.when(ServiceLoader.getTextService()).thenReturn(service); // getTextService() is a static method
    String expectedReturnUrl = "https://www.bjpeter.com";
    Mockito.when(service.getEnvText("secure.application.url")).thenReturn(expectedReturnUrl);

    // Now write unit tests.
    expectedReturnUrl = "https://www.bjpeter.com";
    String testUrl = "https://r87.com/?http://www.bjpeter.com/";
    // safeReturnUri() calls ServiceLoader.getTextService().getEnvText()
    String actualReturnUrl = WebUtils.safeReturnUri(testUrl, false);
    Assert.assertEquals(actualReturnUrl, expectedReturnUrl);

    expectedReturnUrl = "https://www.bjpeter.com";
    testUrl = "www.bjpeter.com";
    actualReturnUrl = WebUtils.safeReturnUri(testUrl, false);
    Assert.assertEquals(actualReturnUrl, expectedReturnUrl);

    expectedReturnUrl = "https://www.bjpeter.com";
    testUrl = "http://www.bjpeter.com";
    actualReturnUrl = WebUtils.safeReturnUri(testUrl, false);
    Assert.assertEquals(actualReturnUrl, expectedReturnUrl);

    expectedReturnUrl = "https://www.bjpeter.com";
    testUrl = "https://www.bjpeter.com";
    actualReturnUrl = WebUtils.safeReturnUri(testUrl, false);
    Assert.assertEquals(actualReturnUrl, expectedReturnUrl);

    expectedReturnUrl = "https://www.bjpeter.com/welcome.html";
    testUrl = "https://www.bjpeter.com/welcome.html";
    actualReturnUrl = WebUtils.safeReturnUri(testUrl, false);
    Assert.assertEquals(actualReturnUrl, expectedReturnUrl);
  }
  
}