嘲笑私有方法

Question

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;
    }
}

以下是日志供参考：

IllegalStateException：无法转换名为com.xyz.TestLoad的类。原因:java.io.ioException：无效常量类型：在org.powermock.core.classloader.mockClassLoader.loadModifiedClass(MockClassLoader.java:180)在org.powermock.core.classloader.mockClassLoader.java:68)在java.lang.ClassLoader.loadClass（deferSupportingClassLoader.java:357)在java.lang.Class.forName(class.java:348)在java.lang.Class.ForName0 it4.common.internal.impl.junit4TestSuiteChunkerImpl.createDelegatorfromClassLoader(junit4TestSuiteChunkerImpl.java:145)在org.powermock.modules.JUnit4.common.internal.impl.junit4TestSuiteChunkerImpl.jreateDelegatorfromClassLoader(junit4TestSuiteChunkerImpl.java:40)在IMPL.(JUnit4TestSuiteChunkerImpl.java:61)在org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.(AbstractCommonPowerMockRunner.java:32)，org.powermock.modules.junit4.PowerMockRunner.(powerMockRunner.java:34)，sun.reflect.nativeConstructorAccessorImpl.NewInstance0（本机方法）

Answer 1

您的测试代码看起来像是在使用PowerMock EasyMock。但是你的帖子也有mockito和PowerMockito的标签。

我用PowerMockito给出下面的解决方案。

主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;
 }
}

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"); 

}

}

generateList method is called
test output:[00]