ros2 eloquent demos ros_testing missing
I have a ROS2 Eloquent installed from binaries and kept up to date. When I try to build the demos from github.com/ros2/demos out of the box, on some of the packages I get errors that ros_testingConfig.cmake required in the cmake is missing. When I've had similar errors about other packages, it was because the package wasn't installed. I've searched for how to install ros_testing and can find nothing. I can build the packages by turning BUILD_TESTING off in the colcon build.
Is ros_testing not installed or available? I've spent a good bit of time on this. I can find nothing Googling for "ros_testing" period. What I assume to be ros_testing at github.com/ros2/ros_testing seems very sparse with on usage or installation information.