- Fixed tests to allow support of MongoDB 3.2

- Replaced MongoDB 2.4 tests in CI by MongoDB 3.2

tests/utils.py

@@ -10,6 +10,13 @@ from mongoengine.python_support import IS_PYMONGO_3
 MONGO_TEST_DB = 'mongoenginetest'   # standard name for the test database
 
 
+# Constant that can be used to compare the version retrieved with
+# get_mongodb_version()
+MONGODB_26 = (2, 6)
+MONGODB_3 = (3,0)
+MONGODB_32 = (3, 2)
+
+
 class MongoDBTestCase(unittest.TestCase):
     """Base class for tests that need a mongodb connection
     It ensures that the db is clean at the beginning and dropped at the end automatically
@@ -27,24 +34,26 @@ class MongoDBTestCase(unittest.TestCase):
 
 
 def get_mongodb_version():
-    """Return the version tuple of the MongoDB server that the default
-    connection is connected to.
+    """Return the version of the connected mongoDB (first 2 digits)
+
+    :return: tuple(int, int)
     """
-    return tuple(get_connection().server_info()['versionArray'])
+    version_list = get_connection().server_info()['versionArray'][:2]     # e.g: (3, 2)
+    return tuple(version_list)
 
 
-def _decorated_with_ver_requirement(func, ver_tuple):
+def _decorated_with_ver_requirement(func, version):
     """Return a given function decorated with the version requirement
     for a particular MongoDB version tuple.
+
+    :param version: The version required (tuple(int, int))
     """
     def _inner(*args, **kwargs):
-        mongodb_ver = get_mongodb_version()
-        if mongodb_ver >= ver_tuple:
+        MONGODB_V = get_mongodb_version()
+        if MONGODB_V >= version:
             return func(*args, **kwargs)
 
-        raise SkipTest('Needs MongoDB v{}+'.format(
-            '.'.join([str(v) for v in ver_tuple])
-        ))
+        raise SkipTest('Needs MongoDB v{}+'.format('.'.join(str(n) for n in version)))
 
     _inner.__name__ = func.__name__
     _inner.__doc__ = func.__doc__
@@ -56,14 +65,14 @@ def needs_mongodb_v26(func):
     """Raise a SkipTest exception if we're working with MongoDB version
     lower than v2.6.
     """
-    return _decorated_with_ver_requirement(func, (2, 6))
+    return _decorated_with_ver_requirement(func, MONGODB_26)
 
 
 def needs_mongodb_v3(func):
     """Raise a SkipTest exception if we're working with MongoDB version
     lower than v3.0.
     """
-    return _decorated_with_ver_requirement(func, (3, 0))
+    return _decorated_with_ver_requirement(func, MONGODB_3)
 
 
 def skip_pymongo3(f):