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rostest basically uses roslaunch files (http://wiki.ros.org/roslaunch/XML). And in launch files you can specify parameters (http://wiki.ros.org/roslaunch/XML/param) as mentioned in your referenced wiki page.
I think you can safely assume that parameters from launch files get correctly set on the parameter server when you start them. Actually there are specifically tests which ensure such fundamental functionality doesn't regress (rostest launch file: https://github.com/ros/ros_comm/blob/indigo-devel/test/test_roslaunch/test/params_basic.test and the corresponding unit test: https://github.com/ros/ros_comm/blob/indigo-devel/test/test_roslaunch/test/params_basic.py) and they currently pass.
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