Remove volumes on drone and fix test

.drone.yml

@@ -13,8 +13,6 @@ pipeline:
         commands:
             - pip install tox
             - tox -e "${TOXENV}-${DATABASE}"
-        volumes:
-            - cache:/root/.cache
 
 services:
     postgresql:

setup.py

@@ -117,7 +117,4 @@ setup(name='%s_%s' % (PREFIX, MODULE),
     test_loader='trytond.test_loader:Loader',
     tests_require=tests_require,
     use_2to3=True,
-    convert_2to3_doctests=[
-        'tests/scenario_country_zip.rst',
-        ],
     )

tests/__init__.py

@@ -1,7 +1,9 @@
-#This file is part helloword module for Tryton.
-#The COPYRIGHT file at the top level of this repository contains 
-#the full copyright notices and license terms.
-
-from .test_country_zip import suite
+# This file is part helloword module for Tryton.  The COPYRIGHT file at the top
+# level of this repository contains the full copyright notices and license
+# terms.
+try:
+    from trytond.modules.country_zip.tests.test_country_zip import suite
+except ImportError:
+    from .test_country_zip import suite
 
 __all__ = ['suite']

tox.ini

@@ -15,4 +15,4 @@ setenv =
     sqlite: DB_NAME={env:SQLITE_NAME::memory:}
     postgresql: DB_NAME={env:POSTGRESQL_NAME:test}
     mysql: DB_NAME={env:MYSQL_NAME:test}
-install_command = pip install --pre --find-links https://trydevpi.tryton.org/ {opts} {packages}
+install_command = pip install --pre --process-dependency-links {opts} {packages}