Multiple Cores running in rostest

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I'm running tests in the latest navigation branch, but keep getting errors when I run

catkin_make run_tests

The errors claim that there is already a roscore instance open on that port. Full output of the command is seen here but the relevant bit is...

-- run_tests.py: execute commands
  /opt/ros/groovy/bin/rostest --pkgdir=/home/dlu/catkin/src/navigation/costmap_2d --package=costmap_2d --results-filename test_simple_driving_test.xml /home/dlu/catkin/src/navigation/costmap_2d/test/simple_driving_test.xml
... logging to /home/dlu/.ros/log/rostest-serenity-8918.log
[ROSUNIT] Outputting test results to /home/dlu/catkin/build/test_results/costmap_2d/rostest-test_simple_driving_test.xml
[ WARN] [1368241605.099039962]: Message from [/rosbag] has a non-fully-qualified frame_id [base_laser]. Resolved locally to [/base_laser].  This is will likely not work in multi-robot systems.  This message will only print once.
[ WARN] [1368241605.108304546, 19.527194170]: No laser scan received (and thus no pose updates have been published) for 19.527194 seconds.  Verify that data is being published on the /base_scan topic.
testsimple_driving_test ... ERROR!
ERROR: roscore cannot run as another roscore/master is already running. 
Please kill other roscore/master processes before relaunching.
The ROS_MASTER_URI is http://serenity:22422/
  File "/usr/lib/python2.7/unittest/case.py", line 332, in run
    testMethod()
  File "/opt/ros/groovy/lib/python2.7/dist-packages/rostest/runner.py", line 121, in fn
    succeeded, failed = self.test_parent.launch()
  File "/opt/ros/groovy/lib/python2.7/dist-packages/rostest/rostest_parent.py", line 81, in launch
    return self.runner.launch()
  File "/opt/ros/groovy/lib/python2.7/dist-packages/roslaunch/launch.py", line 644, in launch
    self._setup()
  File "/opt/ros/groovy/lib/python2.7/dist-packages/roslaunch/launch.py", line 620, in _setup
    self._launch_master()
  File "/opt/ros/groovy/lib/python2.7/dist-packages/roslaunch/launch.py", line 381, in _launch_master
    raise RLException("roscore cannot run as another roscore/master is already running. \nPlease kill other roscore/master processes before relaunching.\nThe ROS_MASTER_URI is %s"%(m.uri))
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However running the tests with the individual command works just fine.

/opt/ros/groovy/bin/rostest --pkgdir=/home/dlu/catkin/src/navigation/costmap_2d --package=costmap_2d --results-filename test_simple_driving_test.xml /home/dlu/catkin/src/navigation/costmap_2d/test/simple_driving_test.xml

The CMake command for the above listed test is...

add_rostest(test/simple_driving_test.xml)
catkin_add_gtest(module_tests test/module_tests.cpp)

In the words of "David after Dentist," "WHY IS THIS HAPPENING? IS THIS GOING TO BE FOREVER?"