diff --git a/.drone.yml b/.drone.yml
new file mode 100644
index 0000000000..a4d2595986
--- /dev/null
+++ b/.drone.yml
@@ -0,0 +1,9 @@
+image: python2.7
+env:
+  - POSTGRESQL_URI=postgresql://postgres@127.0.0.1:5432/
+  - MYSQL_URI=mysql://root@127.0.0.1:3306/
+script:
+  - pip install tox
+  - tox -e sqlite,postgresql
+services:
+  - postgres
diff --git a/setup.py b/setup.py
index 3a65a7c0c9..e38cb9459b 100644
--- a/setup.py
+++ b/setup.py
@@ -46,7 +46,12 @@ for dep in info.get('depends', []):
     if not re.match(r'(ir|res|webdav)(\W|$)', dep):
         requires.append(get_require_version('trytond_%s' % dep))
 requires.append(get_require_version('trytond'))
+
 tests_require = [get_require_version('proteus')]
+dependency_links = []
+if minor_version % 2:
+    # Add development index for testing with proteus
+    dependency_links.append('https://trydevpi.tryton.org/')
 
 setup(name=name,
     version=version,
@@ -92,6 +97,7 @@ setup(name=name,
         ],
     license='GPL-3',
     install_requires=requires,
+    dependency_links=dependency_links,
     zip_safe=False,
     entry_points="""
     [trytond.modules]
diff --git a/tests/test_stock.py b/tests/test_stock.py
index 7a5c1394ef..3294408626 100644
--- a/tests/test_stock.py
+++ b/tests/test_stock.py
@@ -669,7 +669,7 @@ def suite():
     suite = trytond.tests.test_tryton.suite()
     from trytond.modules.company.tests import test_company
     for test in test_company.suite():
-        if test not in suite:
+        if test not in suite and not isinstance(test, doctest.DocTestCase):
             suite.addTest(test)
     suite.addTests(unittest.TestLoader().loadTestsFromTestCase(StockTestCase))
     suite.addTests(doctest.DocFileSuite('scenario_stock_shipment_out.rst',
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000000..e213af00e6
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,16 @@
+[tox]
+envlist = py27-{sqlite,postgresql,mysql}
+
+[testenv]
+commands = {envpython} setup.py test
+deps =
+    postgresql: psycopg2 >= 2.0
+    mysql: MySQL-python
+setenv =
+    sqlite: TRYTOND_DATABASE_URI={env:SQLITE_URI:sqlite://}
+    postgresql: TRYTOND_DATABASE_URI={env:POSTGRESQL_URI:postgresql://}
+    mysql: TRYTOND_DATABASE_URI={env:MYSQL_URI:mysql://}
+    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}