CI reports success despite fatal OutOfMemoryError

[jpallas]

Looking at the most recent Travis build we see:

16/03/30 19:02:44 INFO SessionState: Created HDFS directory: file:/tmp/scratch-362b2e98-2401-4066-9a73-06f6dbbc3454/travis/447f0c84-1866-45d9-aeca-53fb780ef096/_tmp_space.db
Internal error when running tests: java.lang.OutOfMemoryError: PermGen space
Exception in thread "Thread-1" java.io.EOFException
    at java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2598)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1318)
    at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1706)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1344)
    at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1706)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1344)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
    at sbt.React.react(ForkTests.scala:114)
    at sbt.ForkTests$$anonfun$mainTestTask$1$Acceptor$2$.run(ForkTests.scala:74)
    at java.lang.Thread.run(Thread.java:745)
Exception in thread "Thread-5" java.io.EOFException
    at java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2598)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1318)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
    at org.scalatest.tools.Framework$ScalaTestRunner$Skeleton$1$React.react(Framework.scala:945)
    at org.scalatest.tools.Framework$ScalaTestRunner$Skeleton$1.run(Framework.scala:934)
    at java.lang.Thread.run(Thread.java:745)
[0m[[0minfo[0m] [0m[36mRun completed in 35 seconds, 691 milliseconds.[0m[0m
[0m[[0minfo[0m] [0m[36mTotal number of tests run: 0[0m[0m
[0m[[0minfo[0m] [0m[36mSuites: completed 0, aborted 0[0m[0m
[0m[[0minfo[0m] [0m[36mTests: succeeded 0, failed 0, canceled 0, ignored 0, pending 0[0m[0m
[0m[[0minfo[0m] [0m[33mNo tests were executed.[0m[0m
[0m[[32msuccess[0m] [0mTotal time: 193 s, completed Mar 30, 2016 7:02:57 PM[0m