Test exception in spin_until_future_complete. (#1345)
Test exception in spin_until_future_complete. (#1345)

Make sure that spin_until_future_complete throws an exception
if we are already spinning.

Signed-off-by: Chris Lalancette <281cd07d7578d97c83271fbbf2faddb83ab3791c@openrobotics.org>
ros2/rclcpp,ros2/rclcpp