我是jMockit的新手。我试图在方法中模拟java.io.File类型的多个实例。有一些地方，我不应该模拟文件对象。出于这个原因，我正在使用@Injectable。它抛出了以下异常。
我不想模拟java.io.File的所有实例。我希望从这些方法返回的实例是实际的文件。
以下是测试类。
/**
*
*/
package org.iis.uafdataloader.tasklet;
import static org.junit.Assert.fail;
import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.util.regex.Pattern;
import mockit.Expectations;
import mockit.Injectable;
import mockit.Mocked;
import mockit.NonStrictExpectations;
import mockit.VerificationsInOrder;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.filefilter.RegexFileFilter;
import org.iis.uafdataloader.tasklet.validation.FileNotFoundException;
import org.junit.Test;
import org.springframework.batch.core.StepContribution;
import org.springframework.batch.core.scope.context.ChunkContext;
import org.springframework.batch.repeat.RepeatStatus;
/**
* @author K23883
*
*/
public class FileMovingTaskletTest {
private FileMovingTasklet fileMovingTasklet;
@Mocked
private StepContribution contribution;
@Mocked
private ChunkContext chunkContext;
/**
* Test method for
* {@link org.iis.uafdataloader.tasklet.FileMovingTasklet#execute(org.springframework.batch.core.StepContribution, org.springframework.batch.core.scope.context.ChunkContext)}
* .
*
* @throws Exception
*/
@Test
public void testExecuteWhenWorkingDirDoesNotExist(
// @Mocked final File file,
@Injectable final File sourceDirectory,
@Injectable final File workingDirectory,
@Injectable final File archiveDirectory,
@Mocked final RegexFileFilter regexFileFilter,
@Mocked final FileUtils fileUtils) throws Exception {
fileMovingTasklet = new FileMovingTasklet();
fileMovingTasklet.setSourceDirectoryPath("sourceDirectoryPath");
fileMovingTasklet.setInFileRegexPattern("inFileRegexPattern");
fileMovingTasklet.setArchiveDirectoryPath("archiveDirectoryPath");
fileMovingTasklet.setWorkingDirectoryPath("workingDirectoryPath");
final File[] sourceDirectoryFiles = new File[] {
new File("sourceDirectoryPath/ISGUAFFILE.D140728.C00"),
new File("sourceDirectoryPath/ISGUAFFILE.D140729.C00") };
final File[] workingDirectoryFiles = new File[] {
new File("workingDirectoryPath/ISGUAFFILE.D140728.C00"),
new File("workingDirectoryPath/ISGUAFFILE.D140729.C00") };
new NonStrictExpectations(){{
new File("sourceDirectoryPath");
result = sourceDirectory;
sourceDirectory.exists();
result = true;
sourceDirectory.isDirectory();
result = true;
// workingDirectory =
new File("workingDirectoryPath");
result = workingDirectory;
workingDirectory.exists();
result = false;
workingDirectory.mkdirs();
FileUtils.cleanDirectory(onInstance(workingDirectory));
FilenameFilter fileNameFilter = new RegexFileFilter(anyString,
Pattern.CASE_INSENSITIVE);
sourceDirectory.listFiles(fileNameFilter);
result = sourceDirectoryFiles;
System.out.println("sourceDirectoryFile :"
+ ((File[]) sourceDirectoryFiles).length);
// for (int i = 0; i < sourceDirectoryFiles.length; i++) {
// FileUtils.moveFileToDirectory(sourceDirectoryFiles[i],
// workingDirectory, true);
// }
// archiveDirectory =
new File("archiveDirectoryPath");
result = archiveDirectory;
workingDirectory.listFiles();
result = workingDirectoryFiles;
// for (int i = 0; i < workingDirectoryFiles.length; i++) {
// FileUtils.copyFileToDirectory(workingDirectoryFiles[i],
// archiveDirectory);
// }
}};
RepeatStatus status = fileMovingTasklet.execute(contribution,
chunkContext);
assert (status == RepeatStatus.FINISHED);
new VerificationsInOrder() {{
sourceDirectory.exists();
onInstance(sourceDirectory).isDirectory();
onInstance(workingDirectory).exists();
onInstance(workingDirectory).mkdirs();
onInstance(sourceDirectory).listFiles((FilenameFilter)any);
FileUtils.moveFileToDirectory((File)any, onInstance(workingDirectory), true);
times = 2;
FileUtils.copyFileToDirectory((File)any, onInstance(archiveDirectory));
times= 2;
}};
}
}
以下是实际实施方法
/*
* (non-Javadoc)
*
* @see org.springframework.batch.core.step.tasklet.Tasklet#execute(org.
* springframework.batch.core.StepContribution,
* org.springframework.batch.core.scope.context.ChunkContext)
*/
@Override
public RepeatStatus execute(StepContribution contribution,
ChunkContext chunkContext) throws Exception {
File sourceDirectory = new File(sourceDirectoryPath);
if (sourceDirectory == null || !sourceDirectory.exists()
|| !sourceDirectory.isDirectory()) {
throw new FileNotFoundException("The source directory '"
+ sourceDirectoryPath
+ "' doesn't exist or can't be read or not a directory");
}
File workingDirectory = new File(workingDirectoryPath);
if (workingDirectory != null && !workingDirectory.exists() ) {
workingDirectory.mkdirs();
}
FileUtils.cleanDirectory(workingDirectory);
FilenameFilter fileFilter = new RegexFileFilter(inFileRegexPattern,
Pattern.CASE_INSENSITIVE);
File[] sourceDirectoryFiles = sourceDirectory.listFiles(fileFilter);
System.out.println("sourceDirectoryFiles : " + sourceDirectoryFiles.length);
for (File file : sourceDirectoryFiles) {
FileUtils.moveFileToDirectory(file, workingDirectory, true);
}
File archiveDirectory = new File(archiveDirectoryPath);
for (File file : workingDirectory.listFiles()) {
FileUtils.copyFileToDirectory(file, archiveDirectory);
}
return RepeatStatus.FINISHED;
}
以下是堆栈跟踪。
java.lang.IllegalStateException: Missing invocation to mocked type at this point; please make sure such invocations appear only after the declaration of a suitable mock field or parameter
at org.iis.uafdataloader.tasklet.FileMovingTaskletTest$1.<init>(FileMovingTaskletTest.java:75)
at org.iis.uafdataloader.tasklet.FileMovingTaskletTest.testExecuteWhenWorkingDirDoesNotExist(FileMovingTaskletTest.java:71)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
请帮助我解决问题。
答案 0 :(得分：2)
@Injectable为您提供了一个模拟实例;它不会影响模拟类型的其他实例。因此，当测试尝试记录new File("sourceDirectoryPath")时，它会说“此时缺少对模拟类型的调用”，正是因为File(String) 而不是被模拟。
要模拟整个File类（包括其构造函数）以便所有实例都受到影响，您需要使用@Mocked，如下例所示：
@Test
public void mockFutureFileObjects(@Mocked File anyFile) throws Exception
{
final String srcDirPath = "sourceDir";
final String wrkDirPath = "workingDir";
new NonStrictExpectations() {{
File srcDir = new File(srcDirPath);
srcDir.exists(); result = true;
srcDir.isDirectory(); result = true;
File wrkDir = new File(wrkDirPath);
wrkDir.exists(); result = true;
}};
sut.execute(srcDirPath, wrkDirPath);
}
JMockit教程describes the same mechanism，虽然语法略有不同。
这就是说，我建议改为用真实的文件和目录编写测试。