Fix deprecations and modernize testing

- use pytest and tox for testing
- fix deprecation warnings from Sphinx and Docutils

tests/test_ip.py

@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 
 from io import StringIO
-from .util import TestApp, test_root
+from .util import SphinxTestApplication, test_root
 import unittest
 
 
@@ -16,7 +16,7 @@ class TestIPExtension(unittest.TestCase):
         if not (test_root / '_static').exists():
             (test_root / '_static').mkdir()
         self.feed_warnfile = StringIO()
-        self.app = TestApp(
+        self.app = SphinxTestApplication(
             buildername='html', warning=self.feed_warnfile, cleanenv=True)
         self.app.build(force_all=True, filenames=[])
 
@@ -34,7 +34,7 @@ class TestIPExtension(unittest.TestCase):
         self.assertIn('ips', ipdomdata)
 
     def find_in_index(self, entry):
-        indexentries = self.app.env.indexentries
+        indexentries = self.app.env.get_domain('index').entries
         for index in indexentries:
             for value in indexentries[index]:
                 if value[1] == entry:

tests/util.py

@@ -19,7 +19,7 @@ from sphinx import application
 __all__ = [
     'test_root',
     'raises', 'raises_msg', 'Struct',
-    'ListOutput', 'TestApp', 'with_app', 'gen_with_app',
+    'ListOutput', 'SphinxTestApplication', 'with_app', 'gen_with_app',
     'Path', 'with_tempdir', 'write_file',
     'sprint',
 ]
@@ -82,7 +82,7 @@ class ListOutput(object):
         self.content.append(text)
 
 
-class TestApp(application.Sphinx):
+class SphinxTestApplication(application.Sphinx):
     """
     A subclass of :class:`Sphinx` that runs on the test root, with some
     better default values for the initialization parameters.
@@ -148,7 +148,7 @@ def with_app(*args, **kwargs):
     def generator(func):
         @wraps(func)
         def deco(*args2, **kwargs2):
-            app = TestApp(*args, **kwargs)
+            app = SphinxTestApplication(*args, **kwargs)
             func(app, *args2, **kwargs2)
             # don't execute cleanup if test failed
             app.cleanup()
@@ -164,7 +164,7 @@ def gen_with_app(*args, **kwargs):
     def generator(func):
         @wraps(func)
         def deco(*args2, **kwargs2):
-            app = TestApp(*args, **kwargs)
+            app = SphinxTestApplication(*args, **kwargs)
             for item in func(app, *args2, **kwargs2):
                 yield item
             # don't execute cleanup if test failed