我正在尝试从 Powermock运行此基线单元测试。使用 Mockito 和 Junit 从该链接按原样运行代码，它运行时没有错误。不幸的是，我需要 Mockito 和 TestNG，这在 10 次测试中有 6 次出现错误：
Mockito cannot mock this class: class replica.java.util.UUID$$PowerMock5
Mockito can only mock visible & non-final classes.
对不起，这是一个很长的代码帖子，但我想完整。第一个测试通过，第二个、第5个、第6个、第7个、第9个和第10个都失败了。这可以在TestNG下工作吗？
编辑 - 添加版本号
这些结果出现在 Mockito V1.9.0、Powermock V1.4.12 和 TestNG v6.8（均在 Java 1.7 下运行）
这是我稍作修改的代码：
/*
* Copyright 2008 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import static org.mockito.BDDMockito.given;
import static org.mockito.Matchers.anyLong;
import static org.mockito.Mockito.times;
import static org.powermock.api.mockito.PowerMockito.doNothing;
import static org.powermock.api.mockito.PowerMockito.mock;
import static org.powermock.api.mockito.PowerMockito.mockStatic;
import static org.powermock.api.mockito.PowerMockito.spy;
import static org.powermock.api.mockito.PowerMockito.verifyStatic;
import static org.powermock.api.mockito.PowerMockito.when;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.UUID;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.testng.PowerMockObjectFactory;
import org.testng.Assert;
import org.testng.IObjectFactory;
import org.testng.annotations.ObjectFactory;
import org.testng.annotations.Test;
/**
* Demonstrates PowerMockito's ability to mock non-final and final system
* classes. To mock a system class you need to prepare the calling class for
* testing. I.e. let's say you're testing class A which interacts with
* URLEncoder then you would do:
*
* <pre>
*
* @PrepareForTest({A.class})
*
* </pre>
*/
// @RunWith(PowerMockRunner.class)
@PrepareForTest({ SystemClassUser.class })
public class SystemClassUserTest {
@ObjectFactory
public IObjectFactory getObjectFactory() {
return new PowerMockObjectFactory();
}
@Test
public void assertThatMockingOfNonFinalSystemClassesWorks() throws Exception {
mockStatic(URLEncoder.class);
when(URLEncoder.encode("string", "enc")).thenReturn("something");
Assert.assertEquals("something", new SystemClassUser().performEncode());
}
@Test
public void assertThatMockingOfTheRuntimeSystemClassWorks() throws Exception {
mockStatic(Runtime.class);
Runtime runtimeMock = mock(Runtime.class);
Process processMock = mock(Process.class);
when(Runtime.getRuntime()).thenReturn(runtimeMock);
when(runtimeMock.exec("command")).thenReturn(processMock);
Assert.assertSame(processMock, new SystemClassUser().executeCommand());
}
@Test
public void assertThatMockingOfFinalSystemClassesWorks() throws Exception {
mockStatic(System.class);
when(System.getProperty("property")).thenReturn("my property");
Assert.assertEquals("my property", new SystemClassUser().getSystemProperty());
}
@Test
public void assertThatPartialMockingOfFinalSystemClassesWorks() throws Exception {
spy(System.class);
when(System.nanoTime()).thenReturn(2L);
new SystemClassUser().doMoreComplicatedStuff();
Assert.assertEquals("2", System.getProperty("nanoTime"));
}
@Test
public void assertThatMockingOfCollectionsWork() throws Exception {
List<?> list = new LinkedList<Object>();
mockStatic(Collections.class);
Collections.shuffle(list);
new SystemClassUser().shuffleCollection(list);
verifyStatic(times(2));
Collections.shuffle(list);
}
@Test
public void assertThatPartialMockingOfFinalSystemClassesWorksForNonVoidMethods() throws Exception {
spy(System.class);
when(System.getProperty("property")).thenReturn("my property");
final SystemClassUser systemClassUser = new SystemClassUser();
systemClassUser.copyProperty("to", "property");
}
@Test
public void assertThatMockingStringWorks() throws Exception {
mockStatic(String.class);
final String string = "string";
final String args = "args";
final String returnValue = "returnValue";
when(String.format(string, args)).thenReturn(returnValue);
final SystemClassUser systemClassUser = new SystemClassUser();
Assert.assertEquals(systemClassUser.format(string, args), returnValue);
}
@Test
public void mockingStaticVoidMethodWorks() throws Exception {
mockStatic(Thread.class);
doNothing().when(Thread.class);
Thread.sleep(anyLong());
long startTime = System.currentTimeMillis();
final SystemClassUser systemClassUser = new SystemClassUser();
systemClassUser.threadSleep();
long endTime = System.currentTimeMillis();
Assert.assertTrue(endTime - startTime < 5000);
}
@Test
public void mockingURLWorks() throws Exception {
URL url = mock(URL.class);
URLConnection urlConnectionMock = mock(URLConnection.class);
when(url.openConnection()).thenReturn(urlConnectionMock);
URLConnection openConnection = url.openConnection();
Assert.assertSame(openConnection, urlConnectionMock);
}
@Test
public void mockingUUIDWorks() throws Exception {
// given
final UUID mock = mock(UUID.class);
mockStatic(UUID.class);
given(UUID.randomUUID()).willReturn(mock);
// when
String actual = new SystemClassUser().generatePerishableToken();
// then
Assert.assertEquals("00000000000000000000000000000000", actual);
}
}
如果有帮助，这里有一个精简的版本，它执行了一个失败的测试：[我不确定我是否应该编辑这个问题，如果我应该这样做，我很抱歉，但它在哪里已经太长了，这种方法似乎更有意义。]
import static org.powermock.api.mockito.PowerMockito.mockStatic;
import static org.powermock.api.mockito.PowerMockito.when;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.testng.PowerMockObjectFactory;
import org.testng.Assert;
import org.testng.IObjectFactory;
import org.testng.annotations.ObjectFactory;
import org.testng.annotations.Test;
@PrepareForTest({ SystemClassUser.class })
public class SystemClassUserTest {
@ObjectFactory
public IObjectFactory getObjectFactory() {
return new PowerMockObjectFactory();
}
@Test
public void assertThatMockingOfFinalSystemClassesWorks() throws Exception {
mockStatic(System.class);
when(System.getProperty("property")).thenReturn("my property");
Assert.assertEquals("my property", new SystemClassUser().getSystemProperty());
}
}
现在这里是类似剥离的 SystemClassUser 类：
import java.io.IOException;
public class SystemClassUser {
public String getSystemProperty() throws IOException {
return System.getProperty("property");
}
}
在此异常中运行结果：
失败：assertThatMockingOfFinalSystemClassesWorks org.mockito.exceptions.base.MockitoException：Mockito 无法模拟此类：class replica.java.lang.System$$PowerMock0 Mockito 只能模拟可见和非最终类。