Java 模拟随机访问文件
我有代码，我正在使用随机访问文件来编写文件。。为了测试该函数，我试图验证writeBytes（）调用是否发生。。但是，由于我在模拟随机访问文件。。测试抛出IO异常并显示“流已关闭”。。我想可能是因为我在模仿随机访问文件。。。。欢迎提出任何建议/解决方法Java 模拟随机访问文件,java,unit-testing,junit,mockito,randomaccessfile,Java,Unit Testing,Junit,Mockito,Randomaccessfile,我有代码，我正在使用随机访问文件来编写文件。。为了测试该函数，我试图验证writeBytes（）调用是否发生。。但是，由于我在模拟随机访问文件。。测试抛出IO异常并显示“流已关闭”。。我想可能是因为我在模仿随机访问文件。。。。欢迎提出任何建议/解决方法 @Test public void testWriteGradesIntoFile_WriteFirstRecord() throws Exception { final String firstRecord = new
@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();
}
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();
}
}
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)
您可以使用JUnit规则并使用真实文件而不是模拟。您可以使用JUnit规则并使用真实文件而不是模拟。在这段代码中，您试图模拟最终的方法，但该方法无法与Mockito一起使用。最后一个方法
writeBytes（）RandomAccessFilewriteBytes（）RandomAccessFile