Fix travis py26 and pypy (#226)

* travis fixes: try pinning 2.6 against trusty

* xfail for pypy bug: https://bitbucket.org/pypy/pypy/issues/3049/systemerror-in-rsocket__setblocking-travis

.travis.yml

@@ -7,7 +7,6 @@ cache: pip
 python:
   # Standard release https://docs.travis-ci.com/user/languages
   # /python#choosing-python-versions-to-test-against
-  - "2.6"  # EOLed 5 years ago. https://www.python.org/dev/peps/pep-0361/#release-lifespan
   - "2.7"
   - "3.4"
   - "3.5"
@@ -15,16 +14,16 @@ python:
 
   # PyPy2.7: https://doc.pypy.org/en/latest
   # /index-of-release-notes.html#cpython-2-7-compatible-versions
-  - pypy          # Python 2.7.13 on PyPy 5.8.0
-  #- pypy-6.0.0   # Python 2.7.13 on PyPy 6.0.0  # Travis needs to upgrade!
+  - pypy
 
   # PyPy3.5: https://doc.pypy.org/en/latest
   # /index-of-release-notes.html#cpython-3-3-compatible-versions
-  - pypy3         # Python 3.5.3 on PyPy PyPy 5.8.0-beta0
-  #- pypy3-6.0.0  # Python 3.5.3 on PyPy 6.0.0  # Travis needs to upgrade!
+  - pypy3
 
 matrix:
   include:
+    - python: 2.6
+      dist: trusty
     - python: 3.7
       dist: xenial     # required for Python 3.7 (travis-ci/travis-ci#9069)
     - python: nightly  # Python 3.8.0a0

tests/test_socketutils.py

@@ -105,7 +105,9 @@ def test_buffers():
 
     return
 
-
+IS_PYPY_2 = ('__pypy__' in sys.builtin_module_names
+             and sys.version_info[0] == 2)
+@pytest.mark.xfail(IS_PYPY_2, reason="pypy2 bug, fixed in 7.2. unmark when this test stops failing on travis (when they upgrade from 7.1)")
 def test_client_disconnecting():
     def get_bs_pair():
         x, y = socket.socketpair()