MXS-1300: Add basic maxctrl tests

Added basic tests for maxctrl. They simply test that the diagnostic
commands work.

maxctrl/CMakeLists.txt

@@ -6,6 +6,14 @@ if (NPM_FOUND)
     WORKING_DIRECTORY ${CMAKE_BINARY_DIR})
   add_custom_target(maxctrl ALL DEPENDS ${CMAKE_BINARY_DIR}/maxctrl/maxctrl)
   install_script(${CMAKE_BINARY_DIR}/maxctrl/maxctrl core)
+
+  add_custom_target(test_maxctrl
+  COMMAND ${CMAKE_SOURCE_DIR}/test/run_npm_test.sh
+  ${CMAKE_SOURCE_DIR}           # Path to MaxScale sources
+  ${CMAKE_CURRENT_SOURCE_DIR}   # Path to test sources
+  ${CMAKE_BINARY_DIR}/maxctrl-test/ # Location where tests are built and run
+  WORKING_DIRECTORY ${CMAKE_BINARY_DIR})
+
 else()
   message(STATUS "Not building MaxCtrl: npm not found")
 endif()