+ @echo " EXTERN_TESTS=<path> - path to out-of-tree test_<name>.py files containing test cases"
+ @echo " EXTERN_PLUGINS=<path>- path to out-of-tree plugins to be loaded by vpp under test"
+ @echo " EXTERN_COV_DIR=<path>- path to out-of-tree prefix, where source, object and .gcda files can be found for coverage report"
+ @echo ""
+ @echo " TEST_DEBUG=1 - turn on debugging of the test framework itself (expert)"