Failing to include surefire default-test execution goal causes Roo shell issues

In order to run both my TestNG & JUnit 4 tests, I configured surefire in the following way in my project's pom:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.11</version>
<executions>
<execution>
<id>default-test</id>
<configuration>
<skipTests>true</skipTests>
</configuration>
</execution>
<execution>
<id>junit-tests</id>
<goals>
<goal>test</goal>
</goals>
<configuration>
<testNGArtifactName>none:none</testNGArtifactName>
<printSummary>false</printSummary>
<redirectTestOutputToFile>true</redirectTestOutputToFile>
<excludes>
<exclude>*/Roo*</exclude>
</excludes>
</configuration>
</execution>
<execution>
<id>testng-tests</id>
<goals>
<goal>test</goal>
</goals>
<configuration>
<junitArtifactName>none:none</junitArtifactName>
<printSummary>false</printSummary>
<redirectTestOutputToFile>true</redirectTestOutputToFile>
<excludes>
<exclude>*/Roo*</exclude>
</excludes>
</configuration>
</execution>
</executions>
</plugin>

Then, after running roo.sh (with development.mode=true), I get the following shell behavior:

____ ____ ____
/ __ \/ __ \/ __ \
/ /_/ / / / / / / /
/ , _/ // / /_/ /
// ||___/___/ 1.2.1.RELEASE [rev 6eae723]

Welcome to Spring Roo. For assistance press TAB or type "hint" then hit ENTER.
[FelixDispatchQueue] at least one goal must be specified
java.lang.IllegalArgumentException: at least one goal must be specified
at org.apache.commons.lang3.Validate.notEmpty(Validate.java:251)
at org.springframework.roo.project.Execution.<init>(Execution.java:48)
at org.springframework.roo.project.Plugin.getExecutions(Plugin.java:137)
at org.springframework.roo.project.Plugin.<init>(Plugin.java:182)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.springframework.roo.project.maven.PomFactoryImpl.parseElements(PomFactoryImpl.java:164)
at org.springframework.roo.project.maven.PomFactoryImpl.getInstance(PomFactoryImpl.java:90)
at org.springframework.roo.project.PomManagementServiceImpl.parseUnparsedPoms(PomManagementServiceImpl.java:206)
at org.springframework.roo.project.PomManagementServiceImpl.updatePomCache(PomManagementServiceImpl.java:336)
at org.springframework.roo.project.PomManagementServiceImpl.getModuleForFileIdentifier(PomManagementServiceImpl.java:123)
at org.springframework.roo.project.AbstractProjectOperations.getModuleForFileIdentifier(AbstractProjectOperations.java:510)
at org.springframework.roo.classpath.TypeLocationServiceImpl.getProposedJavaType(TypeLocationServiceImpl.java:342)
at org.springframework.roo.classpath.TypeLocationServiceImpl.doesPathIndicateJavaType(TypeLocationServiceImpl.java:112)
at org.springframework.roo.classpath.TypeLocationServiceImpl.getPhysicalTypeIdentifier(TypeLocationServiceImpl.java:248)
at org.springframework.roo.classpath.DefaultPhysicalTypeMetadataProvider.onFileEvent(DefaultPhysicalTypeMetadataProvider.java:176)
at org.springframework.roo.file.monitor.polling.PollingFileMonitorService.publish(PollingFileMonitorService.java:429)
at org.springframework.roo.file.monitor.polling.PollingFileMonitorService.scanAll(PollingFileMonitorService.java:642)
at org.springframework.roo.process.manager.internal.MonitoringRequestCommand.callback(MonitoringRequestCommand.java:39)
at org.springframework.roo.process.manager.internal.MonitoringRequestCommand.callback(MonitoringRequestCommand.java:15)
at org.springframework.roo.process.manager.internal.DefaultProcessManager.doTransactionally(DefaultProcessManager.java:169)
at org.springframework.roo.process.manager.internal.DefaultProcessManager.completeStartup(DefaultProcessManager.java:139)
at org.springframework.roo.process.manager.internal.DefaultProcessManager.access$100(DefaultProcessManager.java:35)
at org.springframework.roo.process.manager.internal.DefaultProcessManager$1.frameworkEvent(DefaultProcessManager.java:68)
at org.apache.felix.framework.util.EventDispatcher.invokeFrameworkListenerCallback(EventDispatcher.java:774)
at org.apache.felix.framework.util.EventDispatcher.fireEventImmediately(EventDispatcher.java:725)
at org.apache.felix.framework.util.EventDispatcher.run(EventDispatcher.java:949)
at org.apache.felix.framework.util.EventDispatcher.access$000(EventDispatcher.java:54)
at org.apache.felix.framework.util.EventDispatcher$1.run(EventDispatcher.java:106)
at java.lang.Thread.run(Thread.java:662)
roo> hint
at least one goal must be specified
java.lang.IllegalArgumentException: at least one goal must be specified
at org.apache.commons.lang3.Validate.notEmpty(Validate.java:251)
at org.springframework.roo.project.Execution.<init>(Execution.java:48)
at org.springframework.roo.project.Plugin.getExecutions(Plugin.java:137)
at org.springframework.roo.project.Plugin.<init>(Plugin.java:182)
at sun.reflect.GeneratedConstructorAccessor11.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.springframework.roo.project.maven.PomFactoryImpl.parseElements(PomFactoryImpl.java:164)
at org.springframework.roo.project.maven.PomFactoryImpl.getInstance(PomFactoryImpl.java:90)
at org.springframework.roo.project.PomManagementServiceImpl.parseUnparsedPoms(PomManagementServiceImpl.java:206)
at org.springframework.roo.project.PomManagementServiceImpl.updatePomCache(PomManagementServiceImpl.java:336)
at org.springframework.roo.project.PomManagementServiceImpl.getFocusedModule(PomManagementServiceImpl.java:108)
at org.springframework.roo.project.PomManagementServiceImpl.getFocusedModuleName(PomManagementServiceImpl.java:116)
at org.springframework.roo.project.AbstractProjectOperations.getFocusedModuleName(AbstractProjectOperations.java:494)
at org.springframework.roo.project.AbstractProjectOperations.isFocusedProjectAvailable(AbstractProjectOperations.java:595)
at org.springframework.roo.classpath.operations.HintOperationsImpl.determineTopic(HintOperationsImpl.java:49)
at org.springframework.roo.classpath.operations.HintOperationsImpl.hint(HintOperationsImpl.java:101)
at org.springframework.roo.classpath.operations.HintCommands.hint(HintCommands.java:26)
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.springframework.roo.process.manager.ProcessManagerHostedExecutionStrategy$1.callback(ProcessManagerHostedExecutionStrategy.java:46)
at org.springframework.roo.process.manager.internal.DefaultProcessManager.doTransactionally(DefaultProcessManager.java:169)
at org.springframework.roo.process.manager.internal.DefaultProcessManager.execute(DefaultProcessManager.java:226)
at org.springframework.roo.process.manager.ProcessManagerHostedExecutionStrategy.execute(ProcessManagerHostedExecutionStrategy.java:43)
at org.springframework.roo.shell.AbstractShell.executeCommandImpl(AbstractShell.java:225)
at org.springframework.roo.shell.AbstractShell.executeCommand(AbstractShell.java:135)
at org.springframework.roo.shell.jline.JLineShell.promptLoop(JLineShell.java:420)
at org.springframework.roo.shell.jline.JLineShell.run(JLineShell.java:538)
at java.lang.Thread.run(Thread.java:662)

If I then add <goals><goal>test</goal></goals> to the default-test surefire execution, everything works fine.