add integration test

.travis.yml

@@ -1,5 +1,7 @@
 language: python
 python:
+  - "2.7"
   - "pypy-5.3.1"
+install:  # nothing
 script: ./runtests.sh
 

runtests.sh

@@ -10,4 +10,15 @@ echo '* example Raspberry Pi tests is tests/rpgpio_test.sh which should be *'
 echo '* run with RPi board with connected to pin GPIO21 LED. LED should    *'
 echo '* light up on pullup, set, and DMA test events.                      *'
 echo '**********************************************************************'
-python -m unittest discover "$@" --pattern="test_*.py"
+echo '---------------------------Unit tests---------------------------------'
+pypy -m unittest discover "$@" --pattern="test_*.py"
+echo '-----------------------Integration tests------------------------------'
+sudo pip install .
+res="$(pycnc tests/rects.gcode 2>&1)"
+res="$res$(pycnc tests/test_parser.gcode 2>&1)"
+sudo pip uninstall -y pycnc
+if echo "$res" | grep -q -i error; then
+  echo "$res"
+  exit 1
+fi
+