Fix the warnings, need to handle the repr escaping

tests/test_build_texinfo.py

@@ -35,10 +35,9 @@ if PY3:
 
 
 @pytest.mark.sphinx('texinfo', testroot='warnings', freshenv=True)
-@pytest.mark.xfail(os.name != 'posix', reason="Not working on windows")
 def test_texinfo_warnings(app, status, warning):
     app.builder.build_all()
-    warnings = strip_escseq(warning.getvalue().replace(os.sep, '/'))
+    warnings = strip_escseq(re.sub(re.escape(os.sep) + '{1,2}', '/', warning.getvalue()))
     warnings_exp = TEXINFO_WARNINGS % {
         'root': re.escape(app.srcdir.replace(os.sep, '/'))}
     assert re.match(warnings_exp + '$', warnings), \