From: Hans-Peter Jansen <hpj@urpla.net>
Date: 2017-02-14 23:45:55+0100
Subject: when build for python3, call python3

Index: b/tests/test_cookiecutter_invocation.py
===================================================================
--- a/tests/test_cookiecutter_invocation.py
+++ b/tests/test_cookiecutter_invocation.py
@@ -18,7 +18,7 @@ from cookiecutter import utils
 
 def test_should_raise_error_without_template_arg(capfd):
     with pytest.raises(subprocess.CalledProcessError):
-        subprocess.check_call(['python', '-m', 'cookiecutter.cli'])
+        subprocess.check_call(['python3', '-m', 'cookiecutter.cli'])
 
     _, err = capfd.readouterr()
     exp_message = 'Error: Missing argument "template".'