Remove unused/unneeded legacy code, which gets our code coverage numbers up; enforce this.

.coveragerc

@@ -8,3 +8,5 @@ exclude_lines =
   pragma: no cover
   if __name__ == .__main__.:
   def test_suite()
+
+fail_under = 99

src/sphinxcontrib/programoutput/__init__.py

@@ -167,7 +167,7 @@ def run(self):
 
 
 _Command = namedtuple(
-    'Command', 'command shell hide_standard_error working_directory')
+    '_Command', 'command shell hide_standard_error working_directory')
 
 
 class Command(_Command):
@@ -191,14 +191,7 @@ def __new__(cls, command, shell=False, hide_standard_error=False,
 
     @staticmethod
     def __normalize_command(command, shell): # pylint:disable=unused-private-member
-        # Returns either a native string, to a tuple.
-        if (bytes is str
-                and not isinstance(command, str)
-                and hasattr(command, 'encode')):
-            # Python 2, given a unicode string
-            command = command.encode(sys.getfilesystemencoding())
-            assert isinstance(command, str)
-
+        # Returns either a native string, or a tuple.
         if not shell and isinstance(command, str):
             command = shlex.split(command)
 

src/sphinxcontrib/programoutput/tests/__init__.py

@@ -3,7 +3,6 @@
 import shutil
 import tempfile
 
-from docutils import nodes
 from docutils.parsers.rst import directives
 from docutils.parsers.rst import roles
 from sphinx.application import Sphinx
@@ -53,26 +52,6 @@ def __get__(self, inst, class_):
 html_theme = 'default'
 """
 
-def _find_duplicate_default_nodes():
-    from sphinx import addnodes # pylint:disable=import-outside-toplevel
-
-    class App(object):
-
-        def __init__(self):
-            self.nodes = set()
-
-        def add_node(self, node):
-            self.nodes.add(node.__name__)
-
-
-    app = App()
-    try:
-        addnodes.setup(app)
-    except AttributeError:
-        # Sphinx 1 doesn't have this
-        pass
-
-    return app.nodes
 
 class AppMixin(object):
 
@@ -87,8 +66,6 @@ class AppMixin(object):
 
     document_encoding = 'utf-8'
 
-    duplicate_nodes_to_remove = _find_duplicate_default_nodes()
-
     def setUp(self):
         # Avoid "WARNING: while setting up extension
         # sphinxcontrib.programoutput: directive u'program-output' is
@@ -98,12 +75,6 @@ def setUp(self):
         # Likewise for 'eq'
         self.roles = roles._roles.copy()
 
-        # Avoid "node class 'toctree' is already registered, its visitors will be overridden"
-        # By default this class has *no* `visit_` methods
-        for node in self.duplicate_nodes_to_remove:
-            if hasattr(nodes.GenericNodeVisitor, 'visit_' + node):
-                delattr(nodes.GenericNodeVisitor, 'visit_' + node)
-
     def tearDown(self):
         directives._directives = self.directives
         roles._roles = self.roles