more test

Author: hathach

.travis.yml

@@ -22,6 +22,7 @@ install:
   # Install BSP for tools, then remove and create symlink the git code
   - arduino --install-boards adafruit:nrf52
   - ls $HOME/.arduino15/packages/adafruit/hardware
+  - ls $HOME/.arduino15/packages/adafruit/hardware/nrf52
   - rm -r $HOME/.arduino15/packages/adafruit/hardware/nrf52
   - echo $TRAVIS_BUILD_DIR
   - ln -s $TRAVIS_BUILD_DIR $HOME/.arduino15/packages/adafruit/hardware/nrf52