rostest include ros node as dependency

edit

How do you include a ros node in your ROS_WS/src directory into your rostest unit tests? project_i_depend_on is just a simple ros node I wrote to reuse test fixture code in multiple projects, but I can only reference it if I include it as a relative directory which is super hacky:

#include "../../project_i_depend_on/include/project_i_depend_on/stuff.h"

Here's my rostest cmake:

 if(CATKIN_ENABLE_TESTING)
#  find_package(rostest REQUIRED)
  find_package(catkin REQUIRED COMPONENTS rostest project_i_depend_on)

  add_rostest_gtest(
    ${PROJECT_NAME}_tests
          # TODO: why cant we file glob here to get test sources?
          test/${PROJECT_NAME}_tests.launch
          test/my_tests.cpp
          src/my_source.cpp
  )

  # inject the test/resources directory into the header template, producing a reference for it the tests can use
  include_directories(${CMAKE_BINARY_DIR})

  target_link_libraries(
    ${PROJECT_NAME}_tests
      ${catkin_LIBRARIES}
      ${OpenCV_LIBS}
  )

  add_dependencies(
    ${PROJECT_NAME}_tests
    ${PROJECT_NAME}
    ${catkin_EXPORTED_TARGETS}
  )
endif()

and my package.xml just has rostest as a test_depend. I've added the other project as a test_depend and regular depend but neither works.