Run tests with warnings and bytes warnings

All warnings except expected warnings are turned into exceptions.

Fixed a resource warning in schema test case.

Rename Tests/ldif to Tests/data to prevent an ImportWarning with Python 2:

    Traceback (most recent call last):
    ...
    ImportWarning: Not importing directory 'Tests/ldif': missing __init__.py

https://github.com/python-ldap/python-ldap/pull/15
Signed-off-by: Christian Heimes <cheimes@redhat.com>

Tests/t_ldap_schema_subentry.py

@@ -5,16 +5,19 @@
 See https://www.python-ldap.org/ for details.
 """
 
+import os
 import unittest
 import time
 
 import ldif
 import ldap.schema
 from ldap.schema.models import ObjectClass
 
+HERE = os.path.abspath(os.path.dirname(__file__))
+
 TEST_SUBSCHEMA_FILES = (
-    'Tests/ldif/subschema-ipa.demo1.freeipa.org.ldif',
-    'Tests/ldif/subschema-openldap-all.ldif',
+    os.path.join(HERE, 'data', 'subschema-ipa.demo1.freeipa.org.ldif'),
+    os.path.join(HERE, 'data', 'subschema-openldap-all.ldif'),
 )
 
 class TestSubschemaLDIF(unittest.TestCase):
@@ -25,9 +28,9 @@ class TestSubschemaLDIF(unittest.TestCase):
     def test_subschema_file(self):
         for test_file in TEST_SUBSCHEMA_FILES:
             # Read and parse LDIF file
-            ldif_file = open(test_file, 'rb')
-            ldif_parser = ldif.LDIFRecordList(ldif_file,max_entries=1)
-            ldif_parser.parse()
+            with open(test_file, 'rb') as ldif_file:
+                ldif_parser = ldif.LDIFRecordList(ldif_file,max_entries=1)
+                ldif_parser.parse()
             _, subschema_subentry = ldif_parser.all_records[0]
             sub_schema = ldap.schema.SubSchema(subschema_subentry)
 

tox.ini

@@ -9,8 +9,20 @@ envlist = py27,py33,py34,py35,py36,coverage-report
 
 [testenv]
 deps = coverage
-commands = {envpython} -m coverage run --parallel setup.py test
 passenv = WITH_GCOV
+# - Enable BytesWarning 
+# - Turn all warnings into exceptions.
+# - 'ignore:the imp module is deprecated' is required to ignore import of
+#   'imp' in distutils. Python 3.3 and 3.4 use PendingDeprecationWarning.
+commands = {envpython} -bb -Werror \
+    "-Wignore:the imp module is deprecated:DeprecationWarning" \
+    "-Wignore:the imp module is deprecated:PendingDeprecationWarning" \
+    -m coverage run --parallel setup.py test
+
+[testenv:py27]
+# No warnings with Python 2.7
+commands = {envpython} \
+    -m coverage run --parallel setup.py test
 
 [testenv:coverage-report]
 deps = coverage