This is with version 260.

$ mvn install
...
-------------------------------------------------------
T E S T S
-------------------------------------------------------
Running hudson.tasks.MailerTest
Exploding hudson.war at
/workplace2/hamacher-SafetyNet/Hudson/build/exploded-hudson/hudson-1.260/war/target/hudson.war
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 2.411 sec <<<
FAILURE!
Running hudson.scm.SubversionSCMTest
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.056 sec <<<
FAILURE!
Running hudson.model.AbstractProjectTest
Tests run: 3, Failures: 0, Errors: 3, Skipped: 0, Time elapsed: 0.023 sec <<<
FAILURE!
Running hudson.pages.SystemConfigurationTestCase
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.004 sec <<<
FAILURE!
Running hudson.bugs.JnlpAccessWithSecuredHudsonTest
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.005 sec <<<
FAILURE!
Running hudson.bugs.LoginRedirectTest
Tests run: 2, Failures: 0, Errors: 2, Skipped: 0, Time elapsed: 0.035 sec <<<
FAILURE!
Running hudson.scm.ScmTest
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.005 sec <<<
FAILURE!
Running hudson.model.JobPropertyTest
Tests run: 3, Failures: 0, Errors: 3, Skipped: 0, Time elapsed: 0.011 sec <<<
FAILURE!
Running hudson.slaves.JNLPLauncherTest
Tests run: 2, Failures: 0, Errors: 2, Skipped: 0, Time elapsed: 0.007 sec <<<
FAILURE!
Running hudson.model.FreeStyleProjectTest
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.004 sec <<<
FAILURE!
Running hudson.bugs.DateConversionTest
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.987 sec
Running hudson.model.QueueTest
Tests run: 3, Failures: 0, Errors: 3, Skipped: 0, Time elapsed: 0.014 sec <<<
FAILURE!
Running org.jvnet.hudson.main.AppTest
Tests run: 2, Failures: 0, Errors: 2, Skipped: 0, Time elapsed: 0.009 sec <<<
FAILURE!
Running hudson.model.UserTestCase
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.013 sec <<<
FAILURE!
Running hudson.model.HudsonTest
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.098 sec <<<
FAILURE!

Results :

Tests in error:
testSenderAddress(hudson.tasks.MailerTest)
testTaggingPermission(hudson.scm.SubversionSCMTest)
testWipeWorkspace(hudson.model.AbstractProjectTest)
testWipeWorkspaceProtected(hudson.model.AbstractProjectTest)
testWipeWorkspaceProtected2(hudson.model.AbstractProjectTest)
testPageDecoratorIsListedInPage(hudson.pages.SystemConfigurationTestCase)
test(hudson.bugs.JnlpAccessWithSecuredHudsonTest)
testRedirect(hudson.bugs.LoginRedirectTest)
testRedirect2(hudson.bugs.LoginRedirectTest)
testProjectDeletionAndCallback(hudson.scm.ScmTest)

testJobPropertySummaryIsShownInMavenModuleSetIndexPage(hudson.model.JobPropertyTest)

testJobPropertySummaryIsShownInMatrixProjectIndexPage(hudson.model.JobPropertyTest)

testJobPropertySummaryIsShownInFreeStyleProjectIndexPage(hudson.model.JobPropertyTest)
testLaunch(hudson.slaves.JNLPLauncherTest)
testHeadlessLaunch(hudson.slaves.JNLPLauncherTest)
testConfigSubmission(hudson.model.FreeStyleProjectTest)
testPersistence(hudson.model.QueueTest)
testPersistence2(hudson.model.QueueTest)
testFileItemPersistence(hudson.model.QueueTest)
test1(org.jvnet.hudson.main.AppTest)
test2(org.jvnet.hudson.main.AppTest)
testUserPropertySummaryIsShownInUserPage(hudson.model.UserTestCase)
testSimpleConfigSubmit(hudson.model.HudsonTest)

Tests run: 24, Failures: 0, Errors: 23, Skipped: 0

[INFO] ------------------------------------------------------------------------
[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] There are test failures.

If I look at one of the specific failures:

-------------------------------------------------------------------------------
Test set: hudson.tasks.MailerTest
-------------------------------------------------------------------------------
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 2.412 sec <<<
FAILURE!
testSenderAddress(hudson.tasks.MailerTest) Time elapsed: 2.238 sec <<< ERROR!
java.lang.Exception: Failed to initialize exploded war
at org.jvnet.hudson.test.WarExploder.getExplodedDir(WarExploder.java:21)
at org.jvnet.hudson.test.HudsonTestCase.createWebServer(HudsonTestCase.java:168)
at org.jvnet.hudson.test.HudsonTestCase.newHudson(HudsonTestCase.java:158)
at org.jvnet.hudson.test.HudsonTestCase.setUp(HudsonTestCase.java:112)
at junit.framework.TestCase.runBare(TestCase.java:125)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
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.apache.maven.surefire.junit.JUnitTestSet.execute(JUnitTestSet.java:213)
at
org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:140)
at
org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:127)
at org.apache.maven.surefire.Surefire.run(Surefire.java:177)
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.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:338)
at org.apache.maven.surefire.booter.SurefireBooter.run(SurefireBooter.java:241)
at
org.apache.maven.plugin.surefire.SurefirePlugin.execute(SurefirePlugin.java:492)
at
org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:451)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:558)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:499)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:478)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:330)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:291)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:142)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:336)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:129)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:287)
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.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
Caused by: java.io.FileNotFoundException: ./target/hudson-for-test/.timestamp
(No such file or directory)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.<init>(FileOutputStream.java:179)
at java.io.FileOutputStream.<init>(FileOutputStream.java:131)
at org.jvnet.hudson.test.WarExploder.explode(WarExploder.java:71)
at org.jvnet.hudson.test.WarExploder.<clinit>(WarExploder.java:30)
... 43 more
Caused by: java.io.FileNotFoundException: ./target/hudson-for-test/.timestamp
(No such file or directory)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.<init>(FileOutputStream.java:179)
at java.io.FileOutputStream.<init>(FileOutputStream.java:131)
at org.jvnet.hudson.test.WarExploder.explode(WarExploder.java:71)
at org.jvnet.hudson.test.WarExploder.<clinit>(WarExploder.java:30)
... 43 more

Let me know if there's any more information I can provide.

Thanks,

Josh