根據surefire 拉起Junit單元測試類 輸出的報錯日志 跟蹤執行過程：

日志1：

java.lang.reflect.InvocationTargetExceptionat 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 ut.com.suning.common.UnitTestHelper.invokPrivate(UnitTestHelper.java:36)at ut.com.suning.scus.web.controller.OverSeaPlantStoreControllerTest.testImportData(OverSeaPlantStoreControllerTest.java:224)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.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)at org.powermock.modules.junit4.rule.PowerMockStatement.evaluate(PowerMockRule.java:63)at org.junit.rules.ExpectedException$ExpectedExceptionStatement.evaluate(ExpectedException.java:110)at org.junit.rules.RunRules.evaluate(RunRules.java:18)at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)at org.junit.runners.ParentRunner.run(ParentRunner.java:300)at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:283)at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:173)at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:153)at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:128)at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:203)at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:155)at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:103) Caused by: com.suning.framework.exception.BaseException: java.lang.IllegalArgumentException: [Assertion failed] - this argument is required; it must not be nullat com.suning.scus.web.controller.OverSeaPlantStoreController.importData(OverSeaPlantStoreController.java:239)... 34 more Caused by: java.lang.IllegalArgumentException: [Assertion failed] - this argument is required; it must not be nullat org.springframework.util.Assert.notNull(Assert.java:112)at org.springframework.util.Assert.notNull(Assert.java:123)at com.suning.scus.admin.util.ReadExcelUtils.readTitle(ReadExcelUtils.java:71)at com.suning.scus.web.controller.OverSeaPlantStoreController.importData(OverSeaPlantStoreController.java:221)... 34 more

它的主pom的依賴和日志3一樣，但是這個module中沒有使用testng：

<dependency><groupId>org.testng</groupId><artifactId>testng</artifactId><version>${testng.version}</version><scope>test</scope></dependency><dependency><groupId>org.powermock</groupId><artifactId>powermock-api-mockito</artifactId><version>${powermock.version}</version><scope>test</scope></dependency><dependency><groupId>org.powermock</groupId><artifactId>powermock-core</artifactId><version>${powermock.version}</version><scope>test</scope></dependency><dependency><groupId>org.powermock</groupId><artifactId>powermock-module-testng</artifactId><version>${powermock.version}</version><scope>test</scope></dependency><dependency><groupId>org.powermock</groupId><artifactId>powermock-module-junit4-rule-agent</artifactId><version>${powermock.version}</version><scope>test</scope></dependency><dependency><groupId>org.powermock</groupId><artifactId>powermock-module-junit4</artifactId><version>${powermock.version}</version><scope>test</scope></dependency><dependency><groupId>org.hamcrest</groupId><artifactId>hamcrest-all</artifactId><version>1.3</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>${spring-version}</version><scope>test</scope></dependency><dependency><groupId>org.testng</groupId><artifactId>testng</artifactId><version>${testng.version}</version><scope>test</scope></dependency>

日志2：

java.lang.instrument.IllegalClassFormatException: Error while instrumenting class com/suning/epp/sws/fundrecharge/esb/impl/FundResultCallbackBizImpl$1.at org.jacoco.agent.rt.internal_6da5971.CoverageTransformer.transform(CoverageTransformer.java:93)at sun.instrument.TransformerManager.transform(TransformerManager.java:169)at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:365)at java.lang.ClassLoader.defineClass1(Native Method)at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)at java.lang.ClassLoader.defineClass(ClassLoader.java:615)at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)at java.net.URLClassLoader.access$000(URLClassLoader.java:58)at java.net.URLClassLoader$1.run(URLClassLoader.java:197)at java.security.AccessController.doPrivileged(Native Method)at java.net.URLClassLoader.findClass(URLClassLoader.java:190)at java.lang.ClassLoader.loadClass(ClassLoader.java:306)at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)at java.lang.ClassLoader.loadClass(ClassLoader.java:247)at com.suning.epp.sws.fundrecharge.esb.impl.FundResultCallbackBizImpl.callback(FundResultCallbackBizImpl.java:47)at com.suning.epp.sws.fundwithdraw.FundWithdrawResultListenersTest.testFundHandleTest(FundWithdrawResultListenersTest.java:66)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)at java.lang.reflect.Method.invoke(Method.java:597)at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)at org.junit.runners.ParentRunner.run(ParentRunner.java:236)at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:367)at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:274)at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238)at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:161)at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:290)at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:242)at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:121) Caused by: java.io.IOException: Error while instrumenting class com/suning/epp/sws/fundrecharge/esb/impl/FundResultCallbackBizImpl$1.at org.jacoco.agent.rt.internal_6da5971.core.instr.Instrumenter.instrumentError(Instrumenter.java:160)at org.jacoco.agent.rt.internal_6da5971.core.instr.Instrumenter.instrument(Instrumenter.java:111)at org.jacoco.agent.rt.internal_6da5971.CoverageTransformer.transform(CoverageTransformer.java:91)... 45 more Caused by: java.lang.IllegalStateException: Class com/suning/epp/sws/fundrecharge/esb/impl/FundResultCallbackBizImpl$1 is already instrumented.at org.jacoco.agent.rt.internal_6da5971.core.internal.instr.InstrSupport.assertNotInstrumented(InstrSupport.java:89)at org.jacoco.agent.rt.internal_6da5971.core.internal.instr.ClassInstrumenter.visitField(ClassInstrumenter.java:55)at org.jacoco.agent.rt.internal_6da5971.asm.ClassVisitor.visitField(ClassVisitor.java:272)at org.jacoco.agent.rt.internal_6da5971.asm.ClassReader.readField(ClassReader.java:768)at org.jacoco.agent.rt.internal_6da5971.asm.ClassReader.accept(ClassReader.java:689)at org.jacoco.agent.rt.internal_6da5971.asm.ClassReader.accept(ClassReader.java:506)at org.jacoco.agent.rt.internal_6da5971.core.instr.Instrumenter.instrument(Instrumenter.java:84)at org.jacoco.agent.rt.internal_6da5971.core.instr.Instrumenter.instrument(Instrumenter.java:108)... 46 more

日志3：testng和junit混合使用，junit編寫測試類，testng xml聲明測試參數，但是testng是在主pom中聲明的：

java.lang.reflect.InvocationTargetExceptionat 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 ut.com.suning.common.UnitTestHelper.invokPrivate(UnitTestHelper.java:36)at ut.com.suning.scus.common.rule.PublicRuleUtilsTest.testTransToMdmCityCode(PublicRuleUtilsTest.java:632)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.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)at org.powermock.modules.junit4.rule.PowerMockStatement.evaluate(PowerMockRule.java:63)at org.junit.rules.ExpectedException$ExpectedExceptionStatement.evaluate(ExpectedException.java:110)at org.junit.rules.RunRules.evaluate(RunRules.java:18)at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)at org.junit.runners.ParentRunner.run(ParentRunner.java:300)at org.junit.runner.JUnitCore.run(JUnitCore.java:157)at org.junit.runner.JUnitCore.run(JUnitCore.java:136)at org.testng.junit.JUnit4TestRunner.start(JUnit4TestRunner.java:81)at org.testng.junit.JUnit4TestRunner.run(JUnit4TestRunner.java:69)at org.testng.TestRunner$1.run(TestRunner.java:682)at org.testng.TestRunner.runWorkers(TestRunner.java:1005)at org.testng.TestRunner.privateRunJUnit(TestRunner.java:713)at org.testng.TestRunner.run(TestRunner.java:614)at org.testng.SuiteRunner.runTest(SuiteRunner.java:348)at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:343)at org.testng.SuiteRunner.privateRun(SuiteRunner.java:305)at org.testng.SuiteRunner.run(SuiteRunner.java:254)at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)at org.testng.TestNG.runSuitesSequentially(TestNG.java:1224)at org.testng.TestNG.runSuitesLocally(TestNG.java:1149)at org.testng.TestNG.run(TestNG.java:1057)at org.apache.maven.surefire.testng.TestNGExecutor.run(TestNGExecutor.java:115)at org.apache.maven.surefire.testng.TestNGDirectoryTestSuite.executeMulti(TestNGDirectoryTestSuite.java:212)at org.apache.maven.surefire.testng.TestNGDirectoryTestSuite.execute(TestNGDirectoryTestSuite.java:108)at org.apache.maven.surefire.testng.TestNGProvider.invoke(TestNGProvider.java:111)at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:203)at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:155)at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:103) Caused by: java.lang.NullPointerExceptionat com.suning.scus.common.rule.PublicRuleUtils.transToMdmCityCode(PublicRuleUtils.java:161)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.powermock.api.mockito.internal.invocation.MockitoMethodInvocationControl$1.invoke(MockitoMethodInvocationControl.java:242)at org.powermock.api.mockito.internal.invocation.MockitoMethodInvocationControl.performIntercept(MockitoMethodInvocationControl.java:260)at org.powermock.api.mockito.internal.invocation.MockitoMethodInvocationControl.invoke(MockitoMethodInvocationControl.java:192)at org.powermock.core.MockGateway.doMethodCall(MockGateway.java:124)at org.powermock.core.MockGateway.methodCall(MockGateway.java:63)at com.suning.scus.common.rule.PublicRuleUtils.transToMdmCityCode(PublicRuleUtils.java)... 51 more

pom文件聲明依賴有testng，junit，springtest，powermock-junit-rule，等

之所以混用，是因為需要使用testng聲明xml,在xml中添加參數：

<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd" ><suite name="Suite1" verbose="1"><test name="appMoudle1"><classes></classes></test><!-- <test name="appMoudle2"><parameter name="dataSetFile" value="/dataset/dataset-module2.xml" /><classes><class name="com.framework.test.DbInitializer" /><class name="com.sample.UserTest" /></classes></test> --></suite>

<dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.10</version><scope>test</scope></dependency><dependency><groupId>org.testng</groupId><artifactId>testng</artifactId><version>${testng.version}</version><scope>test</scope></dependency><dependency><groupId>org.powermock</groupId><artifactId>powermock-api-mockito</artifactId><version>${powermock.version}</version><scope>test</scope></dependency><dependency><groupId>org.powermock</groupId><artifactId>powermock-core</artifactId><version>${powermock.version}</version><scope>test</scope></dependency><dependency><groupId>org.powermock</groupId><artifactId>powermock-module-testng</artifactId><version>${powermock.version}</version><scope>test</scope></dependency><dependency><groupId>org.powermock</groupId><artifactId>powermock-module-junit4-rule-agent</artifactId><version>${powermock.version}</version><scope>test</scope></dependency><dependency><groupId>org.powermock</groupId><artifactId>powermock-module-junit4</artifactId><version>${powermock.version}</version><scope>test</scope></dependency><dependency><groupId>org.hamcrest</groupId><artifactId>hamcrest-all</artifactId><version>1.3</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>${spring-version}</version><scope>test</scope></dependency>

根據日志1進行源碼閱讀跟蹤：

ForkedBooter代碼：

public final class ForkedBooter {private static final long SYSTEM_EXIT_TIMEOUT_IN_SECONDS = 30;private static final long PING_TIMEOUT_IN_SECONDS = 20;private static final ScheduledExecutorService JVM_TERMINATOR = createJvmTerminator();/*** This method is invoked when Surefire is forked - this method parses and organizes the arguments passed to it and* then calls the Surefire class' run method. <p/> The system exit code will be 1 if an exception is thrown.** @param args Commandline arguments*/public static void main( String... args ){final CommandReader reader = startupMasterProcessReader();final ScheduledFuture<?> pingScheduler = listenToShutdownCommands( reader );final PrintStream originalOut = System.out;try{if ( args.length > 1 ){SystemPropertyManager.setSystemProperties( new File( args[1] ) );}File surefirePropertiesFile = new File( args[0] );InputStream stream = surefirePropertiesFile.exists() ? new FileInputStream( surefirePropertiesFile ) : null;BooterDeserializer booterDeserializer = new BooterDeserializer( stream );ProviderConfiguration providerConfiguration = booterDeserializer.deserialize();final StartupConfiguration startupConfiguration = booterDeserializer.getProviderConfiguration();TypeEncodedValue forkedTestSet = providerConfiguration.getTestForFork();boolean readTestsFromInputStream = providerConfiguration.isReadTestsFromInStream();final ClasspathConfiguration classpathConfiguration = startupConfiguration.getClasspathConfiguration();if ( startupConfiguration.isManifestOnlyJarRequestedAndUsable() ){classpathConfiguration.trickClassPathWhenManifestOnlyClasspath();}ClassLoader classLoader = Thread.currentThread().getContextClassLoader();classLoader.setDefaultAssertionStatus( classpathConfiguration.isEnableAssertions() );startupConfiguration.writeSurefireTestClasspathProperty();final Object testSet;if ( forkedTestSet != null ){testSet = forkedTestSet.getDecodedValue( classLoader );}else if ( readTestsFromInputStream ){testSet = new LazyTestsToRun( originalOut );}else{testSet = null;}try{runSuitesInProcess( testSet, startupConfiguration, providerConfiguration, originalOut );}catch ( InvocationTargetException t ){LegacyPojoStackTraceWriter stackTraceWriter =new LegacyPojoStackTraceWriter( "test subystem", "no method", t.getTargetException() );StringBuilder stringBuilder = new StringBuilder();encode( stringBuilder, stackTraceWriter, false );encodeAndWriteToOutput( ( (char) BOOTERCODE_ERROR ) + ",0," + stringBuilder + "\n" , originalOut );}catch ( Throwable t ){StackTraceWriter stackTraceWriter = new LegacyPojoStackTraceWriter( "test subystem", "no method", t );StringBuilder stringBuilder = new StringBuilder();encode( stringBuilder, stackTraceWriter, false );encodeAndWriteToOutput( ( (char) BOOTERCODE_ERROR ) + ",0," + stringBuilder + "\n", originalOut );}// Say bye.encodeAndWriteToOutput( ( (char) BOOTERCODE_BYE ) + ",0,BYE!\n", originalOut );originalOut.flush();// noinspection CallToSystemExitexit( 0, EXIT, reader, false );}catch ( Throwable t ){// Just throwing does getMessage() and a local trace - we want to call printStackTrace for a full trace// noinspection UseOfSystemOutOrSystemErrt.printStackTrace( System.err );// noinspection ProhibitedExceptionThrown,CallToSystemExitexit( 1, EXIT, reader, false );}finally{pingScheduler.cancel( true );}}private static CommandReader startupMasterProcessReader(){return CommandReader.getReader();}private static ScheduledFuture<?> listenToShutdownCommands( CommandReader reader ){reader.addShutdownListener( createExitHandler( reader ) );AtomicBoolean pingDone = new AtomicBoolean( true );reader.addNoopListener( createPingHandler( pingDone ) );return JVM_TERMINATOR.scheduleAtFixedRate( createPingJob( pingDone, reader ),0, PING_TIMEOUT_IN_SECONDS, SECONDS );}private static CommandListener createPingHandler( final AtomicBoolean pingDone ){return new CommandListener(){public void update( Command command ){pingDone.set( true );}};}private static CommandListener createExitHandler( final CommandReader reader ){return new CommandListener(){public void update( Command command ){exit( 1, command.toShutdownData(), reader, true );}};}private static Runnable createPingJob( final AtomicBoolean pingDone, final CommandReader reader ){return new Runnable(){public void run(){boolean hasPing = pingDone.getAndSet( false );if ( !hasPing ){exit( 1, KILL, reader, true );}}};}private static void encodeAndWriteToOutput( String string, PrintStream out ){byte[] encodeBytes = encodeStringForForkCommunication( string );out.write( encodeBytes, 0, encodeBytes.length );}private static void exit( int returnCode, Shutdown shutdownType, CommandReader reader, boolean stopReaderOnExit ){switch ( shutdownType ){case KILL:Runtime.getRuntime().halt( returnCode );case EXIT:if ( stopReaderOnExit ){reader.stop();}launchLastDitchDaemonShutdownThread( returnCode );System.exit( returnCode );case DEFAULT:// refers to shutdown=testset, but not used now, keeping reader opendefault:break;}}private static RunResult runSuitesInProcess( Object testSet, StartupConfiguration startupConfiguration,ProviderConfiguration providerConfiguration,PrintStream originalSystemOut )throws SurefireExecutionException, TestSetFailedException, InvocationTargetException{final ReporterFactory factory = createForkingReporterFactory( providerConfiguration, originalSystemOut );return invokeProviderInSameClassLoader( testSet, factory, providerConfiguration, true, startupConfiguration,false );}private static ReporterFactory createForkingReporterFactory( ProviderConfiguration providerConfiguration,PrintStream originalSystemOut ){final boolean trimStackTrace = providerConfiguration.getReporterConfiguration().isTrimStackTrace();return SurefireReflector.createForkingReporterFactoryInCurrentClassLoader( trimStackTrace, originalSystemOut );}private static ScheduledExecutorService createJvmTerminator(){ThreadFactory threadFactory = newDaemonThreadFactory( "last-ditch-daemon-shutdown-thread-"+ SYSTEM_EXIT_TIMEOUT_IN_SECONDS+ "sec" );ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor( 1, threadFactory );executor.setMaximumPoolSize( 1 );executor.prestartCoreThread();return executor;}@SuppressWarnings( "checkstyle:emptyblock" )private static void launchLastDitchDaemonShutdownThread( final int returnCode ){JVM_TERMINATOR.schedule( new Runnable(){public void run(){Runtime.getRuntime().halt( returnCode );}}, SYSTEM_EXIT_TIMEOUT_IN_SECONDS, SECONDS );}private static RunResult invokeProviderInSameClassLoader( Object testSet, Object factory,ProviderConfiguration providerConfiguration,boolean insideFork,StartupConfiguration startupConfig,boolean restoreStreams )throws TestSetFailedException, InvocationTargetException{final PrintStream orgSystemOut = System.out;final PrintStream orgSystemErr = System.err;// Note that System.out/System.err are also read in the "ReporterConfiguration" instatiation// in createProvider below. These are the same values as here.try{return createProviderInCurrentClassloader( startupConfig, insideFork, providerConfiguration, factory ).invoke( testSet );}finally{if ( restoreStreams && System.getSecurityManager() == null ){System.setOut( orgSystemOut );System.setErr( orgSystemErr );}}}private static SurefireProvider createProviderInCurrentClassloader( StartupConfiguration startupConfiguration1,boolean isInsideFork,ProviderConfiguration providerConfiguration,Object reporterManagerFactory1 ){BaseProviderFactory bpf = new BaseProviderFactory( (ReporterFactory) reporterManagerFactory1, isInsideFork );bpf.setTestRequest( providerConfiguration.getTestSuiteDefinition() );bpf.setReporterConfiguration( providerConfiguration.getReporterConfiguration() );ClassLoader classLoader = Thread.currentThread().getContextClassLoader();bpf.setClassLoaders( classLoader );bpf.setTestArtifactInfo( providerConfiguration.getTestArtifact() );bpf.setProviderProperties( providerConfiguration.getProviderProperties() );bpf.setRunOrderParameters( providerConfiguration.getRunOrderParameters() );bpf.setDirectoryScannerParameters( providerConfiguration.getDirScannerParams() );bpf.setMainCliOptions( providerConfiguration.getMainCliOptions() );bpf.setSkipAfterFailureCount( providerConfiguration.getSkipAfterFailureCount() );bpf.setShutdown( providerConfiguration.getShutdown() );String providerClass = startupConfiguration1.getActualClassName();return (SurefireProvider) ReflectionUtils.instantiateOneArg( classLoader, providerClass, ProviderParameters.class, bpf );} }

ReflectionUtils代碼：

public final class ReflectionUtils {private static final Class[] NO_ARGS = new Class[0];private static final Object[] NO_ARGS_VALUES = new Object[0];private ReflectionUtils(){throw new IllegalStateException("no instantiable constructor");}public static Method getMethod(Object instance, String methodName, Class<?>... parameters){return getMethod(instance.getClass(), methodName, parameters);}public static Method getMethod(Class<?> clazz, String methodName, Class<?>... parameters){try{return clazz.getMethod(methodName, parameters);}catch (NoSuchMethodException e){throw new RuntimeException("When finding method " + methodName, e);}}public static Method tryGetMethod(Class<?> clazz, String methodName, Class<?>... parameters){try{return clazz.getMethod(methodName, parameters);}catch (NoSuchMethodException e) {}return null;}public static Object invokeGetter(Object instance, String methodName){Method method = getMethod(instance, methodName, NO_ARGS);return invokeMethodWithArray(instance, method, NO_ARGS_VALUES);}public static Constructor getConstructor(Class<?> clazz, Class<?>... arguments){try{return clazz.getConstructor(arguments);}catch (NoSuchMethodException e){throw new SurefireReflectionException(e);}}public static Object newInstance(Constructor constructor, Object... params){try{return constructor.newInstance(params);}catch (InvocationTargetException e){throw new SurefireReflectionException(e);}catch (InstantiationException e){throw new SurefireReflectionException(e);}catch (IllegalAccessException e){throw new SurefireReflectionException(e);}}public static <T> T instantiate(ClassLoader classLoader, String classname, Class<T> returnType){try{Class<?> clazz = loadClass(classLoader, classname);return returnType.cast(clazz.newInstance());}catch (InstantiationException e){throw new SurefireReflectionException(e);}catch (IllegalAccessException e){throw new SurefireReflectionException(e);}}public static Object instantiateOneArg(ClassLoader classLoader, String className, Class<?> param1Class, Object param1){try{Class<?> aClass = loadClass(classLoader, className);Constructor constructor = getConstructor(aClass, new Class[] { param1Class });return constructor.newInstance(new Object[] { param1 });}catch (InvocationTargetException e){throw new SurefireReflectionException(e.getTargetException());}catch (InstantiationException e){throw new SurefireReflectionException(e);}catch (IllegalAccessException e){throw new SurefireReflectionException(e);}}public static Object instantiateTwoArgs(ClassLoader classLoader, String className, Class<?> param1Class, Object param1, Class param2Class, Object param2){try{Class<?> aClass = loadClass(classLoader, className);Constructor constructor = getConstructor(aClass, new Class[] { param1Class, param2Class });return constructor.newInstance(new Object[] { param1, param2 });}catch (InvocationTargetException e){throw new SurefireReflectionException(e.getTargetException());}catch (InstantiationException e){throw new SurefireReflectionException(e);}catch (IllegalAccessException e){throw new SurefireReflectionException(e);}}public static void invokeSetter(Object o, String name, Class<?> value1clazz, Object value){Method setter = getMethod(o, name, new Class[] { value1clazz });invokeSetter(o, setter, value);}public static Object invokeSetter(Object target, Method method, Object value){return invokeMethodWithArray(target, method, new Object[] { value });}public static Object invokeMethodWithArray(Object target, Method method, Object... args){try{return method.invoke(target, args);}catch (IllegalAccessException e){throw new SurefireReflectionException(e);}catch (InvocationTargetException e){throw new SurefireReflectionException(e.getTargetException());}}public static Object invokeMethodWithArray2(Object target, Method method, Object... args)throws InvocationTargetException{try{return method.invoke(target, args);}catch (IllegalAccessException e){throw new SurefireReflectionException(e);}}public static Object instantiateObject(String className, Class[] types, Object[] params, ClassLoader classLoader){Class<?> clazz = loadClass(classLoader, className);Constructor constructor = getConstructor(clazz, types);return newInstance(constructor, params);}public static Class<?> tryLoadClass(ClassLoader classLoader, String className){try{return classLoader.loadClass(className);}catch (NoClassDefFoundError localNoClassDefFoundError) {}catch (ClassNotFoundException localClassNotFoundException) {}return null;}public static Class<?> loadClass(ClassLoader classLoader, String className){try{return classLoader.loadClass(className);}catch (NoClassDefFoundError e){throw new SurefireReflectionException(e);}catch (ClassNotFoundException e){throw new SurefireReflectionException(e);}} }
junit和surefire中間調度很重要的代碼是SurefireProvider
public abstract interface SurefireProvider {public abstract Iterable<Class<?>> getSuites();public abstract RunResult invoke(Object paramObject)throws TestSetFailedException, ReporterException, InvocationTargetException;public abstract void cancel(); }

surefire-api 中有一個abstractProvider，起到中間連接的作用：

public abstract class AbstractProviderimplements SurefireProvider {private final Thread creatingThread = Thread.currentThread();public void cancel(){synchronized (this.creatingThread){if (this.creatingThread.isAlive()) {this.creatingThread.interrupt();}}} }

surefire-junit4.jar中有兩個class，一個是JUnit4Provider，一個是TestResolverFilter

public JUnit4Provider( ProviderParameters bootParams ){// don't start a thread in CommandReader while we are in in-plugin processcommandsReader = bootParams.isInsideFork() ? getReader().setShutdown( bootParams.getShutdown() ) : null;providerParameters = bootParams;testClassLoader = bootParams.getTestClassLoader();scanResult = bootParams.getScanResult();runOrderCalculator = bootParams.getRunOrderCalculator();String listeners = bootParams.getProviderProperties().get( "listener" );customRunListeners = unmodifiableCollection( createCustomListeners( listeners ) );jUnit4TestChecker = new JUnit4TestChecker( testClassLoader );TestRequest testRequest = bootParams.getTestRequest();testResolver = testRequest.getTestListResolver();rerunFailingTestsCount = testRequest.getRerunFailingTestsCount();}public RunResult invoke( Object forkTestSet )throws TestSetFailedException{upgradeCheck();ReporterFactory reporterFactory = providerParameters.getReporterFactory();RunResult runResult;try{RunListener reporter = reporterFactory.createReporter();startCapture( (ConsoleOutputReceiver) reporter );// startCapture() called in prior to setTestsToRun()if ( testsToRun == null ){setTestsToRun( forkTestSet );}Notifier notifier = new Notifier( new JUnit4RunListener( reporter ), getSkipAfterFailureCount() );Result result = new Result();notifier.addListeners( customRunListeners ).addListener( result.createListener() );if ( isFailFast() && commandsReader != null ){registerPleaseStopJUnitListener( notifier );}try{notifier.fireTestRunStarted( testsToRun.allowEagerReading()? createTestsDescription( testsToRun ): createDescription( UNDETERMINED_TESTS_DESCRIPTION ) );if ( commandsReader != null ){registerShutdownListener( testsToRun );commandsReader.awaitStarted();}for ( Class<?> testToRun : testsToRun ){executeTestSet( testToRun, reporter, notifier );}}finally{notifier.fireTestRunFinished( result );notifier.removeListeners();}rethrowAnyTestMechanismFailures( result );}finally{runResult = reporterFactory.close();}return runResult;}private void setTestsToRun( Object forkTestSet )throws TestSetFailedException{if ( forkTestSet instanceof TestsToRun ){testsToRun = (TestsToRun) forkTestSet;}else if ( forkTestSet instanceof Class ){testsToRun = fromClass( (Class<?>) forkTestSet );}else{testsToRun = scanClassPath();}}private boolean isRerunFailingTests(){return rerunFailingTestsCount > 0;}private boolean isFailFast(){return providerParameters.getSkipAfterFailureCount() > 0;}private int getSkipAfterFailureCount(){return isFailFast() ? providerParameters.getSkipAfterFailureCount() : 0;}private void registerShutdownListener( final TestsToRun testsToRun ){commandsReader.addShutdownListener( new CommandListener(){public void update( Command command ){testsToRun.markTestSetFinished();}} );}private void registerPleaseStopJUnitListener( final Notifier notifier ){commandsReader.addSkipNextTestsListener( new CommandListener(){public void update( Command command ){notifier.pleaseStop();}} );}private void executeTestSet( Class<?> clazz, RunListener reporter, Notifier notifier ){final ReportEntry report = new SimpleReportEntry( getClass().getName(), clazz.getName() );reporter.testSetStarting( report );try{executeWithRerun( clazz, notifier );}catch ( Throwable e ){if ( isFailFast() && e instanceof StoppedByUserException ){String reason = e.getClass().getName();Description skippedTest = createDescription( clazz.getName(), createIgnored( reason ) );notifier.fireTestIgnored( skippedTest );}else{String reportName = report.getName();String reportSourceName = report.getSourceName();PojoStackTraceWriter stackWriter = new PojoStackTraceWriter( reportSourceName, reportName, e );reporter.testError( withException( reportSourceName, reportName, stackWriter ) );}}finally{reporter.testSetCompleted( report );}}private void executeWithRerun( Class<?> clazz, Notifier notifier )throws TestSetFailedException{JUnitTestFailureListener failureListener = new JUnitTestFailureListener();notifier.addListener( failureListener );boolean hasMethodFilter = testResolver != null && testResolver.hasMethodPatterns();try{try{notifier.asFailFast( isFailFast() );execute( clazz, notifier, hasMethodFilter ? createMethodFilter() : null );}finally{notifier.asFailFast( false );}// Rerun failing tests if rerunFailingTestsCount is larger than 0if ( isRerunFailingTests() ){Notifier rerunNotifier = pureNotifier();notifier.copyListenersTo( rerunNotifier );for ( int i = 0; i < rerunFailingTestsCount && !failureListener.getAllFailures().isEmpty(); i++ ){Set<ClassMethod> failedTests = generateFailingTests( failureListener.getAllFailures() );failureListener.reset();if ( !failedTests.isEmpty() ){executeFailedMethod( rerunNotifier, failedTests );}}}}finally{notifier.removeListener( failureListener );}}public Iterable<Class<?>> getSuites(){testsToRun = scanClassPath();return testsToRun;}private TestsToRun scanClassPath(){final TestsToRun scannedClasses = scanResult.applyFilter( jUnit4TestChecker, testClassLoader );return runOrderCalculator.orderTestClasses( scannedClasses );}private void upgradeCheck()throws TestSetFailedException{if ( isJUnit4UpgradeCheck() ){Collection<Class<?>> classesSkippedByValidation =scanResult.getClassesSkippedByValidation( jUnit4TestChecker, testClassLoader );if ( !classesSkippedByValidation.isEmpty() ){StringBuilder reason = new StringBuilder();reason.append( "Updated check failed\n" );reason.append( "There are tests that would be run with junit4 / surefire 2.6 but not with [2.7,):\n" );for ( Class testClass : classesSkippedByValidation ){reason.append( " " );reason.append( testClass.getName() );reason.append( "\n" );}throw new TestSetFailedException( reason.toString() );}}}static Description createTestsDescription( Iterable<Class<?>> classes ){// "null" string rather than null; otherwise NPE in junit:4.0Description description = createDescription( "null" );for ( Class<?> clazz : classes ){description.addChild( createDescription( clazz.getName() ) );}return description;}private static boolean isJUnit4UpgradeCheck(){return System.getProperty( "surefire.junit4.upgradecheck" ) != null;}private static void execute( Class<?> testClass, Notifier notifier, Filter filter ){final int classModifiers = testClass.getModifiers();if ( !isAbstract( classModifiers ) && !isInterface( classModifiers ) ){Request request = aClass( testClass );if ( filter != null ){request = request.filterWith( filter );}Runner runner = request.getRunner();if ( countTestsInRunner( runner.getDescription() ) != 0 ){runner.run( notifier );}}}private void executeFailedMethod( RunNotifier notifier, Set<ClassMethod> failedMethods )throws TestSetFailedException{for ( ClassMethod failedMethod : failedMethods ){try{Class<?> methodClass = Class.forName( failedMethod.getClazz(), true, testClassLoader );String methodName = failedMethod.getMethod();method( methodClass, methodName ).getRunner().run( notifier );}catch ( ClassNotFoundException e ){throw new TestSetFailedException( "Unable to create test class '" + failedMethod.getClazz() + "'", e );}}}/*** JUnit error: test count includes one test-class as a suite which has filtered out all children.* Then the child test has a description "initializationError0(org.junit.runner.manipulation.Filter)"* for JUnit 4.0 or "initializationError(org.junit.runner.manipulation.Filter)" for JUnit 4.12* and Description#isTest() returns true, but this description is not a real test* and therefore it should not be included in the entire test count.*/private static int countTestsInRunner( Description description ){if ( description.isSuite() ){int count = 0;for ( Description child : description.getChildren() ){if ( !hasFilteredOutAllChildren( child ) ){count += countTestsInRunner( child );}}return count;}else if ( description.isTest() ){return hasFilteredOutAllChildren( description ) ? 0 : 1;}else{return 0;}}private static boolean hasFilteredOutAllChildren( Description description ){String name = description.getDisplayName();// JUnit 4.0: initializationError0; JUnit 4.12: initializationError.if ( name == null ){return true;}else{name = name.trim();return name.startsWith( "initializationError0(org.junit.runner.manipulation.Filter)" )|| name.startsWith( "initializationError(org.junit.runner.manipulation.Filter)" );}}private Filter createMethodFilter(){TestListResolver methodFilter = optionallyWildcardFilter( testResolver );return methodFilter.isEmpty() || methodFilter.isWildcard() ? null : new TestResolverFilter( methodFilter );} }

上述的類中execute方法直接調用的junit中的類Runner：

private static void execute( Class<?> testClass, Notifier notifier, Filter filter ){final int classModifiers = testClass.getModifiers();if ( !isAbstract( classModifiers ) && !isInterface( classModifiers ) ){Request request = aClass( testClass );if ( filter != null ){request = request.filterWith( filter );}Runner runner = request.getRunner();if ( countTestsInRunner( runner.getDescription() ) != 0 ){runner.run( notifier );}}}

junit4中Runner僅僅是一個抽象的類：

public abstract class Runner implements Describable {/* (non-Javadoc)* @see org.junit.runner.Describable#getDescription()*/public abstract Description getDescription();/*** Run the tests for this runner.* @param notifier will be notified of events while tests are being run--tests being * started, finishing, and failing*/public abstract void run(RunNotifier notifier);/*** @return the number of tests to be run by the receiver*/public int testCount() {return getDescription().testCount();} }

Describable：

abstract Describable{ /*** @return a {@link Description} showing the tests to be run by the receiver*/public abstract Description getDescription(); }

然后是org.junit.runners這個包里面ParentRunner類，這個類極為關鍵：

public abstract class ParentRunner<T> extends Runner implements Filterable,Sortable {private final TestClass fTestClass;private Filter fFilter= null;private Sorter fSorter= Sorter.NULL;/*** Constructs a new {@code ParentRunner} that will run {@code @TestClass}* @throws InitializationError */protected ParentRunner(Class<?> testClass) throws InitializationError {fTestClass= new TestClass(testClass);validate();}//// Must be overridden///*** Returns a list of objects that define the children of this Runner.*/protected abstract List<T> getChildren();/*** Returns a {@link Description} for {@code child}, which can be assumed to* be an element of the list returned by {@link ParentRunner#getChildren()}*/protected abstract Description describeChild(T child);/*** Runs the test corresponding to {@code child}, which can be assumed to be* an element of the list returned by {@link ParentRunner#getChildren()}.* Subclasses are responsible for making sure that relevant test events are* reported through {@code notifier}*/protected abstract void runChild(T child, RunNotifier notifier);//// May be overridden///*** Adds to {@code errors} a throwable for each problem noted with the test class (available from {@link #getTestClass()}).* Default implementation adds an error for each method annotated with* {@code @BeforeClass} or {@code @AfterClass} that is not* {@code public static void} with no arguments.*/protected void collectInitializationErrors(List<Throwable> errors) {validatePublicVoidNoArgMethods(BeforeClass.class, true, errors);validatePublicVoidNoArgMethods(AfterClass.class, true, errors);}/*** Adds to {@code errors} if any method in this class is annotated with* {@code annotation}, but:* <ul>* <li>is not public, or* <li>takes parameters, or* <li>returns something other than void, or* <li>is static (given {@code isStatic is false}), or* <li>is not static (given {@code isStatic is true}).*/protected void validatePublicVoidNoArgMethods(Class<? extends Annotation> annotation,boolean isStatic, List<Throwable> errors) {List<FrameworkMethod> methods= getTestClass().getAnnotatedMethods(annotation);for (FrameworkMethod eachTestMethod : methods)eachTestMethod.validatePublicVoidNoArg(isStatic, errors);}/** * Constructs a {@code Statement} to run all of the tests in the test class. Override to add pre-/post-processing. * Here is an outline of the implementation:* <ul>* <li>Call {@link #runChild(Object, RunNotifier)} on each object returned by {@link #getChildren()} (subject to any imposed filter and sort).</li>* <li>ALWAYS run all non-overridden {@code @BeforeClass} methods on this class* and superclasses before the previous step; if any throws an* Exception, stop execution and pass the exception on.* <li>ALWAYS run all non-overridden {@code @AfterClass} methods on this class* and superclasses before any of the previous steps; all AfterClass methods are* always executed: exceptions thrown by previous steps are combined, if* necessary, with exceptions from AfterClass methods into a* {@link MultipleFailureException}.* </ul>* @param notifier* @return {@code Statement}*/protected Statement classBlock(final RunNotifier notifier) {Statement statement= childrenInvoker(notifier);statement= withBeforeClasses(statement);statement= withAfterClasses(statement);return statement;}/*** Returns a {@link Statement}: run all non-overridden {@code @BeforeClass} methods on this class* and superclasses before executing {@code statement}; if any throws an* Exception, stop execution and pass the exception on.*/protected Statement withBeforeClasses(Statement statement) {List<FrameworkMethod> befores= fTestClass.getAnnotatedMethods(BeforeClass.class);statement= new RunBefores(statement, befores, null);return statement;}/*** Returns a {@link Statement}: run all non-overridden {@code @AfterClass} methods on this class* and superclasses before executing {@code statement}; all AfterClass methods are* always executed: exceptions thrown by previous steps are combined, if* necessary, with exceptions from AfterClass methods into a* {@link MultipleFailureException}.*/protected Statement withAfterClasses(Statement statement) {List<FrameworkMethod> afters= fTestClass.getAnnotatedMethods(AfterClass.class);statement= new RunAfters(statement, afters, null);return statement;}/*** Returns a {@link Statement}: Call {@link #runChild(Object, RunNotifier)}* on each object returned by {@link #getChildren()} (subject to any imposed* filter and sort)*/protected Statement childrenInvoker(final RunNotifier notifier) {return new Statement() {@Overridepublic void evaluate() {runChildren(notifier);}};}private void runChildren(final RunNotifier notifier) {for (T each : getFilteredChildren())runChild(each, notifier);}/*** Returns a name used to describe this Runner*/protected String getName() {return fTestClass.getName();}//// Available for subclasses///*** Returns a {@link TestClass} object wrapping the class to be executed.*/protected final TestClass getTestClass() {return fTestClass;}//// Implementation of Runner// @Overridepublic Description getDescription() {Description description= Description.createSuiteDescription(getName(),fTestClass.getAnnotations());for (T child : getFilteredChildren())description.addChild(describeChild(child));return description;}@Overridepublic void run(final RunNotifier notifier) {EachTestNotifier testNotifier= new EachTestNotifier(notifier,getDescription());try {Statement statement= classBlock(notifier);statement.evaluate();} catch (AssumptionViolatedException e) {testNotifier.fireTestIgnored();} catch (StoppedByUserException e) {throw e;} catch (Throwable e) {testNotifier.addFailure(e);}}//// Implementation of Filterable and Sortable//public void filter(Filter filter) throws NoTestsRemainException {fFilter= filter;for (T each : getChildren())if (shouldRun(each))return;throw new NoTestsRemainException();}public void sort(Sorter sorter) {fSorter= sorter;}//// Private implementation// private void validate() throws InitializationError {List<Throwable> errors= new ArrayList<Throwable>();collectInitializationErrors(errors);if (!errors.isEmpty())throw new InitializationError(errors);}protected List<T> getFilteredChildren() {ArrayList<T> filtered= new ArrayList<T>();for (T each : getChildren())if (shouldRun(each))try {filterChild(each);sortChild(each);filtered.add(each);} catch (NoTestsRemainException e) {// don't add it}Collections.sort(filtered, comparator());return filtered;}private void sortChild(T child) {fSorter.apply(child);}private void filterChild(T child) throws NoTestsRemainException {if (fFilter != null)fFilter.apply(child);}private boolean shouldRun(T each) {return fFilter == null || fFilter.shouldRun(describeChild(each));}private Comparator<? super T> comparator() {return new Comparator<T>() {public int compare(T o1, T o2) {return fSorter.compare(describeChild(o1), describeChild(o2));}};} }

然后是BlockJUnit4ClassRunner 繼承了ParentRunner：

public class BlockJUnit4ClassRunner extends ParentRunner<FrameworkMethod> {/*** Creates a BlockJUnit4ClassRunner to run {@code klass}* * @throws InitializationError* if the test class is malformed.*/public BlockJUnit4ClassRunner(Class<?> klass) throws InitializationError {super(klass);}//// Implementation of ParentRunner// @Overrideprotected void runChild(FrameworkMethod method, RunNotifier notifier) {EachTestNotifier eachNotifier= makeNotifier(method, notifier);if (method.getAnnotation(Ignore.class) != null) {eachNotifier.fireTestIgnored();return;}eachNotifier.fireTestStarted();try {methodBlock(method).evaluate();} catch (AssumptionViolatedException e) {eachNotifier.addFailedAssumption(e);} catch (Throwable e) {eachNotifier.addFailure(e);} finally {eachNotifier.fireTestFinished();}}@Overrideprotected Description describeChild(FrameworkMethod method) {return Description.createTestDescription(getTestClass().getJavaClass(),testName(method), method.getAnnotations());}@Overrideprotected List<FrameworkMethod> getChildren() {return computeTestMethods();}//// Override in subclasses///*** Returns the methods that run tests. Default implementation * returns all methods annotated with {@code @Test} on this * class and superclasses that are not overridden.*/protected List<FrameworkMethod> computeTestMethods() {return getTestClass().getAnnotatedMethods(Test.class);}@Overrideprotected void collectInitializationErrors(List<Throwable> errors) {super.collectInitializationErrors(errors);validateConstructor(errors);validateInstanceMethods(errors);}private void validateConstructor(List<Throwable> errors) {validateOnlyOneConstructor(errors);validateZeroArgConstructor(errors);}private void validateOnlyOneConstructor(List<Throwable> errors) {if (!hasOneConstructor()) {String gripe= "Test class should have exactly one public constructor";errors.add(new Exception(gripe));}}/*** Adds to {@code errors} if the test class's single constructor* takes parameters*/protected void validateZeroArgConstructor(List<Throwable> errors) {if (hasOneConstructor()&& !(getTestClass().getOnlyConstructor().getParameterTypes().length == 0)) {String gripe= "Test class should have exactly one public zero-argument constructor";errors.add(new Exception(gripe));}}private boolean hasOneConstructor() {return getTestClass().getJavaClass().getConstructors().length == 1;}/*** Adds to {@code errors} for each method annotated with {@code @Test},* {@code @Before}, or {@code @After} that is not a public, void instance* method with no arguments.*/protected void validateInstanceMethods(List<Throwable> errors) {validatePublicVoidNoArgMethods(After.class, false, errors);validatePublicVoidNoArgMethods(Before.class, false, errors);validateTestMethods(errors);if (computeTestMethods().size() == 0)errors.add(new Exception("No runnable methods"));}/*** Adds to {@code errors} for each method annotated with {@code @Test}that* is not a public, void instance method with no arguments.*/protected void validateTestMethods(List<Throwable> errors) {validatePublicVoidNoArgMethods(Test.class, false, errors);}/*** Returns a new fixture for running a test. Default implementation executes* the test class's no-argument constructor (validation should have ensured* one exists).*/protected Object createTest() throws Exception {return getTestClass().getOnlyConstructor().newInstance();}/*** Returns the name that describes {@code method} for {@link Description}s.* Default implementation is the method's name*/protected String testName(FrameworkMethod method) {return method.getName();}/*** Returns a Statement that, when executed, either returns normally if* {@code method} passes, or throws an exception if {@code method} fails.* * Here is an outline of the default implementation:* * <ul>* <li>Invoke {@code method} on the result of {@code createTest()}, and* throw any exceptions thrown by either operation.* <li>HOWEVER, if {@code method}'s {@code @Test} annotation has the {@code* expecting} attribute, return normally only if the previous step threw an* exception of the correct type, and throw an exception otherwise.* <li>HOWEVER, if {@code method}'s {@code @Test} annotation has the {@code* timeout} attribute, throw an exception if the previous step takes more* than the specified number of milliseconds.* <li>ALWAYS run all non-overridden {@code @Before} methods on this class* and superclasses before any of the previous steps; if any throws an* Exception, stop execution and pass the exception on.* <li>ALWAYS run all non-overridden {@code @After} methods on this class* and superclasses after any of the previous steps; all After methods are* always executed: exceptions thrown by previous steps are combined, if* necessary, with exceptions from After methods into a* {@link MultipleFailureException}.* </ul>* * This can be overridden in subclasses, either by overriding this method,* or the implementations creating each sub-statement.*/protected Statement methodBlock(FrameworkMethod method) {Object test;try {test= new ReflectiveCallable() {@Overrideprotected Object runReflectiveCall() throws Throwable {return createTest();}}.run();} catch (Throwable e) {return new Fail(e);}Statement statement= methodInvoker(method, test);statement= possiblyExpectingExceptions(method, test, statement);statement= withPotentialTimeout(method, test, statement);statement= withBefores(method, test, statement);statement= withAfters(method, test, statement);return statement;}//// Statement builders///*** Returns a {@link Statement} that invokes {@code method} on {@code test}*/protected Statement methodInvoker(FrameworkMethod method, Object test) {return new InvokeMethod(method, test);}/*** Returns a {@link Statement}: if {@code method}'s {@code @Test} annotation* has the {@code expecting} attribute, return normally only if {@code next}* throws an exception of the correct type, and throw an exception* otherwise.*/protected Statement possiblyExpectingExceptions(FrameworkMethod method,Object test, Statement next) {Test annotation= method.getAnnotation(Test.class);return expectsException(annotation) ? new ExpectException(next,getExpectedException(annotation)) : next;}/*** Returns a {@link Statement}: if {@code method}'s {@code @Test} annotation* has the {@code timeout} attribute, throw an exception if {@code next}* takes more than the specified number of milliseconds.*/protected Statement withPotentialTimeout(FrameworkMethod method,Object test, Statement next) {long timeout= getTimeout(method.getAnnotation(Test.class));return timeout > 0 ? new FailOnTimeout(next, timeout) : next;}/*** Returns a {@link Statement}: run all non-overridden {@code @Before}* methods on this class and superclasses before running {@code next}; if* any throws an Exception, stop execution and pass the exception on.*/protected Statement withBefores(FrameworkMethod method, Object target,Statement statement) {List<FrameworkMethod> befores= getTestClass().getAnnotatedMethods(Before.class);return new RunBefores(statement, befores, target);}/*** Returns a {@link Statement}: run all non-overridden {@code @After}* methods on this class and superclasses before running {@code next}; all* After methods are always executed: exceptions thrown by previous steps* are combined, if necessary, with exceptions from After methods into a* {@link MultipleFailureException}.*/protected Statement withAfters(FrameworkMethod method, Object target,Statement statement) {List<FrameworkMethod> afters= getTestClass().getAnnotatedMethods(After.class);return new RunAfters(statement, afters, target);}protected EachTestNotifier makeNotifier(FrameworkMethod method,RunNotifier notifier) {Description description= describeChild(method);return new EachTestNotifier(notifier, description);}private Class<? extends Throwable> getExpectedException(Test annotation) {if (annotation == null || annotation.expected() == None.class)return null;elsereturn annotation.expected();}private boolean expectsException(Test annotation) {return getExpectedException(annotation) != null;}private long getTimeout(Test annotation) {if (annotation == null)return 0;return annotation.timeout();} }

總結

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