[test] Add a tox configuration

Which includes a lower bound for python-requests so that we can drop the
"skip" in tests. Also avoid usage of lgc.testlib.

Closes #17047815 by filling test dependencies in tox.ini.

.hgignore

+syntax: glob
+.tox
+*.egg-info

test/unittest_rqlcontroller.py

@@ -16,23 +16,15 @@
 
 import json
 import urlparse
+import requests
+
 from cubicweb.devtools.httptest import CubicWebServerTC
 
-try:
-    # ensure a recent request lib is available
-    import requests
-    assert [int(n) for n in requests.__version__.split('.', 2)][:2] >= [1, 2]
-except (ImportError, AssertionError):
-    requests = None
 
 
-class RqlIOTc(CubicWebServerTC):
+class RqlIOTC(CubicWebServerTC):
 
-    def setUp(self):
-        "Skip whole test class if a suitable requests module is not available"
-        if requests is None:
-            self.skipTest('Python ``requests`` module is not available')
-        super(RqlIOTc, self).setUp()
+    def setup_database(self):
         with self.admin_access.client_cnx() as cnx:
             self.create_user(cnx, u'toto', password=u'toto')
             cnx.commit()
@@ -123,5 +115,5 @@ class RqlIOTc(CubicWebServerTC):
 
 
 if __name__ == '__main__':
-    from logilab.common.testlib import unittest_main
-    unittest_main()
+    import unittest
+    unittest.main()

tox.ini

+[tox]
+envlist = py27
+
+[testenv]
+deps =
+  pytest
+  requests>=1.2
+  Twisted < 16.0.0
+commands =
+  {envpython} -m pytest test {posargs}
+
+[pytest]
+python_files = *test_*.py