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I found a workaround. In the test script, simply launch a rosout node, but with a different name:

<node name="rosout_test" pkg="rosout" type="rosout" />

This occurred to me while elbow-deep in debugging rostest and roslaunch. I'm suspicious that somehow rostest _thinks_ it launched rosout but in fact did not. If someone out there can explain all this to me, I'd really appreciate it.

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