我有我使用随机访问文件写入文件的代码。为了测试该功能，我试图验证 writeBytes() 调用是否发生。但是，因为我正在模拟随机访问文件.. 测试抛出和 IO 异常说“流关闭”..我认为这可能是因为我正在模拟随机访问文件 ....任何建议/解决方法表示赞赏。
@Test
public void testWriteGradesIntoFile_WriteFirstRecord() throws Exception {
final String firstRecord = new String(empID + "," + score);
PowerMockito.whenNew(File.class).withArguments(outputFileName + ".csv")
.thenReturn(outputFileMock);
PowerMockito.whenNew(RandomAccessFile.class)
.withArguments(outputFileMock, "rw").thenReturn(outputRAFMock);
PowerMockito.mockStatic(WriteGradeReportToCSV.class);
Mockito.when(WriteGradeReportToCSV.checkFileIsEmpty(outputRAFMock))
.thenReturn(true);
Mockito.when(outputRAFMock.length()).thenReturn(fileLength);
Mockito.doNothing().when(outputRAFMock).seek(fileLength);
Mockito.when(gradeReportMock.getEmpId()).thenReturn(empID);
Mockito.when(gradeReportMock.getScore()).thenReturn(score);
Mockito.doNothing().when(outputRAFMock).writeBytes(firstRecord);
writeGradeToCSV.writeGradesIntoFile(gradeReportMock, outputFileName);
Mockito.verify(outputRAFMock, Mockito.times(1)).close();
}
它的功能如下:
File outputCSVFile = null;
RandomAccessFile outputRAF = null;
try {
outputCSVFile = new File(outputFileName + ".csv");
if (outputCSVFile != null) {
outputRAF = new RandomAccessFile(outputCSVFile, "rw");
if (checkFileIsEmpty(outputRAF)) {
// File is empty.Hence write the first record.
outputRAF.seek(outputRAF.length());
outputRAF.writeBytes(new StringBuffer(gradeReport
.getEmpId() + "," + gradeReport.getScore())
.toString());
outputRAF.close();
}
}
故障痕迹如下:
java.io.IOException: Stream Closed
at java.io.RandomAccessFile.writeBytes0(Native Method)
at java.io.RandomAccessFile.writeBytes(RandomAccessFile.java:520)
at java.io.RandomAccessFile.writeBytes(RandomAccessFile.java:1123)
at com.cerner.devcenter.wag.util.WriteGradeReportToCSV_writeGradesIntoFileTest.testWriteGradesIntoFile_WriteFirstRecord(WriteGradeReportToCSV_writeGradesIntoFileTest.java:132)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:68)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:310)
at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:88)
at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:96)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:294)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTestInSuper(PowerMockJUnit47RunnerDelegateImpl.java:127)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTest(PowerMockJUnit47RunnerDelegateImpl.java:82)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:282)
at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:86)
at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:49)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:207)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:146)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:120)
at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:33)
at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:45)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:118)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:104)
at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:53)
at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:53)
at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)
at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)
at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)
最佳答案
在此代码中，您将尝试模拟一个无法与 Mockito 一起使用的 final 方法。 final方法 writeBytes() 将在没有任何警告的情况下被调用。您可以使用 PowerMock 模拟 final方法或重构您的原始代码以注入(inject)您自己的 RandomAccessFile 测试实现。您几乎可以避免以这种方式测试第三方代码。
关于java - 模拟随机访问文件，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27114503/