I tried to get started with Jekins development and to build it. I followed
https://wiki.jenkins-ci.org/display/JENKINS/Building+Jenkins
but when running

mvn -Plight-test install

the build fails:
Results :

Tests in error:
LauncherTest.remoteKill:68 » NumberFormat For input string: ""
XStream2Test.concurrentHashMapSerialization:302 NullPointer

Tests run: 3408, Failures: 0, Errors: 2, Skipped: 3

[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] Jenkins main module ................................ SUCCESS [ 56.906 s]
[INFO] Jenkins cli ........................................ SUCCESS [ 43.173 s]
[INFO] Jenkins core ....................................... FAILURE [02:10 min]
[INFO] Jenkins war ........................................ SKIPPED
[INFO] Test harness for Jenkins and plugins ............... SKIPPED
[INFO] Jenkins plugin POM ................................. SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 05:43 min
[INFO] Finished at: 2015-06-30T17:01:28+02:00
[INFO] Final Memory: 51M/615M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.16:test (default-test) on project jenkins-core: There are test failures.
[ERROR]
[ERROR] Please refer to /Users/wagnerst/Things Folders/Jenkins/jenkins/core/target/surefire-reports for the individual test results.
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR] mvn <goals> -rf :jenkins-core

Anyone has any ideas on that?