[英]Mocking file operations in a unit test using junit and PowerMockito doesn't work
我正在尝试为包含文件操作的静态方法编写单元测试。 我正在使用junit和PowerMockito。 要测试的方法是将csv文件转换为bean列表。 由于这是单元测试,因此我模拟了方法内部的方法调用。 但是发生以下错误,
org.mockito.exceptions.misusing.MissingMethodInvocationException:when()需要一个参数,该参数必须是“模拟的方法调用”。 例如:when(mock.getArticles())。thenReturn(articles);
另外,可能会由于以下原因而出现此错误:1.您对以下方法之一进行存根:final / private / equals()/ hashCode()方法。 这些方法不能存根/验证。 不支持在非公共父类上声明的模拟方法。 2.在when()内部,您不会在模拟对象上调用方法,而是在其他某个对象上调用方法。
在com.mypackage..unittest.UTCSVBeanUtil.convert_convertingCsvToBean(UTCSVBeanUtil.java:54)在sun.reflect.NativeMethodAccessorImpl.invoke0(本机方法)在sun.reflect.NativeMethodAccessorImpl.invoke(未知源)在sun.reflect.DelegatingMethodokeorI (未知源)在java.lang.reflect.Method.invoke(未知源)在org.junit.runners.model.FrameworkMethod $ 1.runReflectiveCall(FrameworkMethod.java:47)
我的课是
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.file.Path;
import java.util.List;
import au.com.bytecode.opencsv.CSVReader;
import au.com.bytecode.opencsv.CSVWriter;
import au.com.bytecode.opencsv.bean.ColumnPositionMappingStrategy;
import au.com.bytecode.opencsv.bean.CsvToBean;
public class CSVBeanUtil {
public static <T> List<T> fileToBean(final String filename, final char delimiter, final Class<T> beanClass,
final String[] columns) throws FileNotFoundException {
BufferedReader reader = new BufferedReader(new FileReader(filename));
try {
return bufferReaderToBean(reader, delimiter, beanClass, columns);
} finally {
if (reader != null) {
try {
reader.close();
} catch (final IOException e) {
// ignore
}
}
}
}
public static <T> List<T> stringToBean() {
return null;
}
public static <T> List<T> bufferReaderToBean(BufferedReader reader, final char delimiter, final Class<T> beanClass,
final String[] columns) {
CSVReader csvreader = null;
final CsvToBean<T> csv = new CsvToBean<T>();
csvreader = new CSVReader(reader, delimiter);
ColumnPositionMappingStrategy<T> strategy = new ColumnPositionMappingStrategy<T>();
strategy.setType(beanClass);
strategy.setColumnMapping(columns);
return csv.parse(strategy, csvreader);
}
public static boolean writeToCsv(List<String[]> beanList, Path absPath) throws IOException {
CSVWriter writer = new CSVWriter(new FileWriter(absPath.toAbsolutePath().toString()),
CSVWriter.DEFAULT_SEPARATOR, CSVWriter.NO_QUOTE_CHARACTER);
writer.writeAll(beanList);
writer.close();
return false;
}
}
我的测试课是
import static org.junit.Assert.assertEquals;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;
import com.mypackage..config.AppConfig;
import com.mypackage..entity.MyFile;
import com.mypackage..service.MyFileValidation;
import com.mypackage..utility.CSVBeanUtil;
import org.apache.commons.io.FileUtils;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;
import org.junit.runner.RunWith;
import org.mockito.Mockito;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.web.WebAppConfiguration;
@WebAppConfiguration
@ContextConfiguration(classes = { AppConfig.class })
@PrepareForTest(CSVBeanUtil.class)
@RunWith(SpringJUnit4ClassRunner.class)
public class UTCSVBeanUtil {
List<MyFile> dataList = new ArrayList<MyFile>();
List<MyFile> expectedList=new ArrayList<MyFile>();
@Before
public void beforeClass() {
expectedList = getdataList();
}
@Test
public void convert_convertingCsvToBean()
throws IOException{
PowerMockito.mockStatic(CSVBeanUtil.class);
// BufferedReader bufferedReader = Mockito.mock(BufferedReader.class); // while using this the test execution doesn't terminate
BufferedReader bufferedReader= new BufferedReader(new StringReader("201030"));
// File file = Mockito.mock(File.class);
Mockito.when(CSVBeanUtil.bufferReaderToBean(bufferedReader, ',', MyFile.class, MyFile.columns))
.thenReturn(expectedList);
dataList.addAll(CSVBeanUtil.fileToBean( null, ',', MyFile.class, MyFile.columns));
assertEquals(expectedList,dataList);
}
private List<MyFile> getdataList() {
List<MyFile> expectedList=new ArrayList<MyFile>();
MyFile gv=new MyFile();
gv.setTRADENUM("201030");
expectedList.add(gv);
return expectedList;
}
}
我正在尝试解决这个问题。 请帮我...谢谢
PowerMock提供自己的运行程序,并通过@RunWith注释指定
@RunWith( PowerMockRunner.class)
如果要使用SpringJUnit4ClassRunner.class
@RunWith(PowerMockRunner.class)
@PowerMockRunnerDelegate(SpringJUnit4ClassRunner.class)
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