Env var PYTHON to allow local test with py3k

Makefile

 
 TESTPYPI = http://testpypi.python.org/pypi
 
-.PHONY: dogfood test clean build dist-test dist
+.PHONY: dogfood test test3 clean build dist-test dist
 
 dogfood:
 	./cdiff.py
 test:
 	tests/regression.sh
 
+test3:
+	PYTHON=python3 tests/regression.sh
+
 clean:
 	rm -f MANIFEST
 	rm -rf build/ cdiff.egg-info/ dist/ __pycache__/

tests/regression.sh

 SELF_DIR=$(cd $(dirname $0) && pwd) || exit 1
 CDIFF=$SELF_DIR/../cdiff
 
+# To test with py3k: PYTHON=python3 make test
+PYTHON=${PYTHON:-python}
+
 function pass()
 {
     if [[ -t 1 ]]; then
     local cdiff_opt=${3:-""}
 
     echo -n "Test option '$cdiff_opt' with input '$input' ... "
-    if $CDIFF $cdiff_opt $input 2>/dev/null \
+    if $PYTHON $CDIFF $cdiff_opt $input 2>/dev/null \
             | diff -ubq $expected_out - >& /dev/null; then
         pass
         return 0