Question

我正在尝试模拟一个内部调用私有方法的方法。此私有方法使用classloader.getclass方法读取文件，并填充列表，该列表是类的静态变量。我尝试了所有可能的方法来模拟这种私有方法，但它似乎没有用。

class TestLoad {
    private static List <String> myList = new ArrayList <String> ();
    private static final String filename = "/myfile.txt";

    public XYZ generateList(Abc abc) throws Exception {
        populateList();
    }

    private populateList() {
        ClassLoader classLoader = TestLoad.class.getClassLoader();
        File listfile = new File(classLoader.getResource(
        filename).getFile());
        List <String> localList = new ArrayList <String> ();

        try (Scanner scanner = new Scanner(listfile)) {
            while (scanner.hasNextLine()) {
                String text = scanner.nextLine();
                localList.add(text.trim());
            }
            scanner.close();
        } catch (IOException e) {}
        return localList;
    }
}

我试图模仿populateList()，但控件一直进入方法。我通过mockito和powermock尝试了网上几乎所有的选项，但它似乎没有用。我的Junit如下所示

类启动有@RunWith（PowerMockRunner.class） @PrepareForTest（TestLoad.class） ArrayList testList = new ArrayList（）; testList.add（＆＃34; 00＆＃34）; TestLoad instance = PowerMock.createPartialMock（TestLoad.class，＆＃34; populateList＆＃34;）; PowerMock.expectPrivate（实例，＆＃34; populateList＆＃34;）。andReturn（testList）; PowerMock.replay（实例）;

以下是供参考的日志：

java.lang.IllegalStateException：无法转换名为com.xyz.TestLoad的类。原因：java.io.IOException：无效的常量类型：18为17 在org.powermock.core.classloader.MockClassLoader.loadMockClass（MockClassLoader.java:266）在org.powermock.core.classloader.MockClassLoader.loadModifiedClass（MockClassLoader.java:180）在org.powermock.core.classloader.DeferSupportingClassLoader.loadClass（DeferSupportingClassLoader.java:68） at java.lang.ClassLoader.loadClass（ClassLoader.java:357） at java.lang.Class.forName0（Native Method）在java.lang.Class.forName（Class.java:348）在org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.createDelegatorFromClassloader（JUnit4TestSuiteChunkerImpl.java:145）在org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.createDelegatorFromClassloader（JUnit4TestSuiteChunkerImpl.java:40）在org.powermock.tests.utils.impl.AbstractTestSuiteChunkerImpl.createTestDelegators（AbstractTestSuiteChunkerImpl.java:244）在org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl。（JUnit4TestSuiteChunkerImpl.java:61）在org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner。（AbstractCommonPowerMockRunner.java:32）在org.powermock.modules.junit4.PowerMockRunner。（PowerMockRunner.java:34） at sun.reflect.NativeConstructorAccessorImpl.newInstance0（Native Method）

Answer 1

您的测试代码看起来像是在使用PowerMock EasyMock。但你的帖子也标有mockito＆amp; powermockito。

我使用powermockito给出了以下解决方案。

主要Java类：

public class TestLoad {

private static List<String> myList = new ArrayList<String>();
private static final String filename = "/myfile.txt";

public List<String> generateList(Abc abc) throws Exception {

    System.out.println("generateList method is called");
    return populateList();
}

private List<String> populateList() {
    System.out.println("populateList method is called");
    ClassLoader classLoader = TestLoad.class.getClassLoader();
    File listfile = new File(classLoader.getResource(filename).getFile());
    // Read listfile and build localList logic here
    List<String> localList = new ArrayList<String>();

    return localList;
 }
}

测试Java类

import java.util.ArrayList;
import java.util.List;

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

@PrepareForTest(TestLoad.class)
@RunWith(PowerMockRunner.class)
public class TestLoadTest {

@Test
public void testPrivateMethod() throws Exception{

    List<String> testList = new ArrayList<String>();
    testList.add("00");

    TestLoad mockInstance = PowerMockito.spy(new TestLoad());

    PowerMockito.doReturn(testList).when(mockInstance, "populateList");

    List<String> outputList = mockInstance.generateList(new Abc());

    System.out.println("test output:" + outputList);

    PowerMockito.verifyPrivate(mockInstance, Mockito.times(1)).invoke("populateList"); 

}

}

控制台输出：

generateList method is called
test output:[00]

Answer 2

经过大量研究后我找到了解决方案。我们需要在pom.xml中添加以下作为依赖项以防止此错误... **

<dependency>
            <groupId>org.javassist</groupId>
            <artifactId>javassist</artifactId>
            <version>3.18.2-GA</version>
        </dependency>

**

模拟私有方法

2 个答案: