avro test: looks like one test fails because a domain is down

cpython encounters the same error
I took the opportunity to switch to py.test from nose
now that we support it and this is how one should test this package.

test/extra/avro_test.py

@@ -5,10 +5,10 @@ from test_helper import create_virtenv, run_test
 
 ENV_NAME = "avro_test_env_" + os.path.basename(sys.executable)
 PYTHON_EXE = os.path.abspath(os.path.join(ENV_NAME, "bin", "python"))
-NOSETESTS_EXE = os.path.abspath(os.path.join(ENV_NAME, "bin", "nosetests"))
+PYTEST_EXE = os.path.abspath(os.path.join(ENV_NAME, "bin", "py.test"))
 AVRO_DIR = os.path.abspath(os.path.join(ENV_NAME, "avro-1.7.7"))
 
-packages = ["nose==1.3.7", "avro==1.7.7"] 
+packages = ["pytest==2.8.7", "py==1.4.29", "avro==1.7.7"] 
 create_virtenv(ENV_NAME, packages, force_create = True)
 
 url = "https://pypi.python.org/packages/source/a/avro/avro-1.7.7.tar.gz"
@@ -18,7 +18,6 @@ subprocess.check_call(["tar", "-zxf", "avro-1.7.7.tar.gz"], cwd=ENV_NAME)
 env = os.environ
 env["PYTHONPATH"] = os.path.abspath(os.path.join(ENV_NAME, "lib/python2.7/site-packages"))
 
-# this tests also fail when run in cpython with nose.
-# pytest makes two of this work but we can't currently run pytest...
-expected = [{'ran': 51, 'errors': 3}]
-run_test([NOSETESTS_EXE], env=env, cwd=AVRO_DIR, expected=expected)
+# cpython has the same number of failures
+expected = [{'failed': 2, 'passed': 47}]
+run_test([PYTEST_EXE], env=env, cwd=AVRO_DIR, expected=expected)