tests fail for Python 3.4 on Debian 8

[taibhse]

I forked the repo, have working tests on Python2, but they fail on Python 3.4.

python3 --version: Python 3.4.2
Debian 8 (jessie)

python3 setup.py test 2> out.txt

test_block_decorator (tests.test_client.TestCounter) ... ok
test_function_decorator (tests.test_client.TestCounter) ... ok
test_increment (tests.test_client.TestCounter) ... ok
test_negative_increment_raises (tests.test_client.TestCounter) ... ok
test_block_decorator (tests.test_client.TestGauge) ... ok
test_function_decorator (tests.test_client.TestGauge) ... ok
test_gauge (tests.test_client.TestGauge) ... ok
test_gauge_function (tests.test_client.TestGauge) ... ok
test_counter (tests.test_client.TestGenerateText) ... ok
test_escaping (tests.test_client.TestGenerateText) ... ok
test_gauge (tests.test_client.TestGenerateText) ... ok
test_nonnumber (tests.test_client.TestGenerateText) ... ok
test_summary (tests.test_client.TestGenerateText) ... ok
test_unicode (tests.test_client.TestGenerateText) ... ok
test_block_decorator (tests.test_client.TestHistogram) ... ok
test_function_decorator (tests.test_client.TestHistogram) ... ok
test_histogram (tests.test_client.TestHistogram) ... ok
test_labels (tests.test_client.TestHistogram) ... ok
test_setting_buckets (tests.test_client.TestHistogram) ... ok
test_child (tests.test_client.TestMetricWrapper) ... ok
test_incorrect_label_count_raises (tests.test_client.TestMetricWrapper) ... ok
test_invalid_names_raise (tests.test_client.TestMetricWrapper) ... ok
test_labels_by_dict (tests.test_client.TestMetricWrapper) ... ok
test_labels_coerced_to_string (tests.test_client.TestMetricWrapper) ... ok
test_namespace_subsystem_concatenated (tests.test_client.TestMetricWrapper) ... ok
test_non_string_labels_raises (tests.test_client.TestMetricWrapper) ... ok
test_remove (tests.test_client.TestMetricWrapper) ... ok
test_namespace (tests.test_client.TestProcessCollector) ... ok
test_working (tests.test_client.TestProcessCollector) ... ok
test_working_584 (tests.test_client.TestProcessCollector) ... ok
test_working_fake_pid (tests.test_client.TestProcessCollector) ... ok
test_delete (tests.test_client.TestPushGateway) ... 127.0.0.1 - - [13/Sep/2015 13:18:04] "DELETE /job/my_job HTTP/1.1" 201 -
ERROR
test_instance_ip_grouping_key (tests.test_client.TestPushGateway) ... /root/client_python/tests/test_client.py:479: ResourceWarning: unclosed <socket.socket fd=6, family=AddressFamily.AF_INET, type=SocketType.SOCK_DGRAM, proto=0, laddr=('127.0.0.1', 53921)>
  self.assertTrue('' != instance_ip_grouping_key()['instance'])
ok
test_push (tests.test_client.TestPushGateway) ... 127.0.0.1 - - [13/Sep/2015 13:18:04] "PUT /job/my_job HTTP/1.1" 201 -
ERROR
test_push_with_complex_groupingkey (tests.test_client.TestPushGateway) ... 127.0.0.1 - - [13/Sep/2015 13:18:04] "PUT /job/my_job/a/9/b/a%2F+z HTTP/1.1" 201 -
ERROR
test_push_with_groupingkey (tests.test_client.TestPushGateway) ... 127.0.0.1 - - [13/Sep/2015 13:18:04] "PUT /job/my_job/a/9 HTTP/1.1" 201 -
ERROR
test_pushadd (tests.test_client.TestPushGateway) ... 127.0.0.1 - - [13/Sep/2015 13:18:04] "POST /job/my_job HTTP/1.1" 201 -
ERROR
est_pushadd_with_groupingkey (tests.test_client.TestPushGateway) ... 127.0.0.1 - - [13/Sep/2015 13:18:04] "DELETE /job/my_job/a/9 HTTP/1.1" 201 -
ERROR
test_block_decorator (tests.test_client.TestSummary) ... ok
test_function_decorator (tests.test_client.TestSummary) ... ok
test_summary (tests.test_client.TestSummary) ... ok
test_labels (tests.graphite_bridge.TestGraphiteBridge) ... ok
test_nolabels (tests.graphite_bridge.TestGraphiteBridge) ... ok
test_sanitizing (tests.graphite_bridge.TestGraphiteBridge) ... ok

======================================================================
ERROR: test_delete (tests.test_client.TestPushGateway)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/root/client_python/tests/test_client.py", line 465, in test_delete
    delete_from_gateway(self.address, "my_job")
  File "/root/client_python/prometheus_client/exposition.py", line 103, in delete_from_gateway
    _use_gateway('DELETE', gateway, job, None, grouping_key, timeout)
  File "/root/client_python/prometheus_client/exposition.py", line 122, in _use_gateway
    resp = build_opener(HTTPHandler).open(request, timeout=timeout)
  File "/usr/lib/python3.4/urllib/request.py", line 455, in open
    response = self._open(req, data)
  File "/usr/lib/python3.4/urllib/request.py", line 473, in _open
    '_open', req)
  File "/usr/lib/python3.4/urllib/request.py", line 433, in _call_chain
    result = func(*args)
  File "/usr/lib/python3.4/urllib/request.py", line 1202, in http_open
    return self.do_open(http.client.HTTPConnection, req)
  File "/usr/lib/python3.4/urllib/request.py", line 1177, in do_open
    r = h.getresponse()
  File "/usr/lib/python3.4/http/client.py", line 1172, in getresponse
    response.begin()
  File "/usr/lib/python3.4/http/client.py", line 351, in begin
    version, status, reason = self._read_status()
  File "/usr/lib/python3.4/http/client.py", line 321, in _read_status
    raise BadStatusLine(line)
http.client.BadStatusLine: ''

======================================================================
ERROR: test_push (tests.test_client.TestPushGateway)
----------------------------------------------------------------------
[....]
======================================================================
ERROR: test_push_with_complex_groupingkey (tests.test_client.TestPushGateway)
----------------------------------------------------------------------
[....]
======================================================================
ERROR: test_push_with_groupingkey (tests.test_client.TestPushGateway)
----------------------------------------------------------------------
[....]
======================================================================
ERROR: test_pushadd (tests.test_client.TestPushGateway)
----------------------------------------------------------------------
[....]
======================================================================
ERROR: test_pushadd_with_groupingkey (tests.test_client.TestPushGateway)
----------------------------------------------------------------------
[....]
----------------------------------------------------------------------
Ran 44 tests in 0.062s

FAILED (errors=6)

[brian-brazil]

Fixed by #50