Introduce nox for matrix testing

.gitignore

@@ -32,6 +32,7 @@ pip-delete-this-directory.txt
 # Unit test / coverage reports
 htmlcov/
 .tox/
+.nox/
 .coverage
 .cache
 nosetests.xml

noxfile.py

@@ -0,0 +1,37 @@
+import os
+from urllib.parse import urlparse
+
+import nox
+
+PIP_INDEX_URL = os.environ.get('NOX_PIP_INDEX_URL', None)
+
+
+@nox.session(python=['2.7', '3.4', '3.6', '3.7'], reuse_venv=True)
+@nox.parametrize('sqlalchemy', ['1.0', '1.1', '1.2', '1.3'])
+@nox.parametrize('hana_driver', ['hdbcli', 'pyhdb'])
+def test(session, sqlalchemy, hana_driver):
+    if 'NOX_SAP_HANA_URI' not in os.environ:
+        session.skip(
+            "Environment variable NOX_SAP_HANA_URI must be defined. "
+            "Example: NOX_SAP_HANA_URI=USERNAME:PASSWORD@sap-hana-host:PORT"
+        )
+
+    pip_env = {}
+    if PIP_INDEX_URL:
+        session.log('Use and trust custom index url from NOX_PIP_INDEX_URL')
+        pip_env = {
+            'PIP_INDEX_URL': PIP_INDEX_URL,
+            'PIP_TRUSTED_HOST': urlparse(PIP_INDEX_URL).netloc
+        }
+
+    session.install('sqlalchemy~={}.0'.format(sqlalchemy))
+    session.install(hana_driver, env=pip_env)
+    session.install('.[test]')
+
+    dburi = 'hana+' + hana_driver + '://' + os.environ['NOX_SAP_HANA_URI']
+    session.run(
+        'pytest',
+        '--dburi', dburi,
+        '--requirements', 'sqlalchemy_hana.requirements:Requirements',
+        *session.posargs
+    )