Revert "ref: move test-skipping logic to the __init__ file for the mongoengine tests"

This reverts commit 756b9412.

flask_admin/tests/mongoengine/__init__.py

-import sys
-
 from flask import Flask
-from nose.plugins.skip import SkipTest
-
 from flask_admin import Admin
-from flask_admin._compat import PY2
-
-# Skip test on PY3
-if not PY2:
-    raise SkipTest('The MongoEngine integration is not Python 3 compatible')
-
-# Skip test on Python 2.6 since it is still supported by flask-admin:
-if sys.version_info[0] == 2 and sys.version_info[1] == 6:
-    raise SkipTest('MongoEngine is not Python 2.6 compatible as of its 0.11 version.')
-
 from flask_mongoengine import MongoEngine
 
 

flask_admin/tests/mongoengine/test_basic.py

-from datetime import datetime
-
 from nose.tools import eq_, ok_
+from nose.plugins.skip import SkipTest
+
+# Skip test on PY3
+from flask_admin._compat import PY2, as_unicode
+if not PY2:
+    raise SkipTest('MongoEngine is not Python 3 compatible')
+# Skip test on Python 2.6 since it is still supported by flask-admin:
+import sys
+if sys.version_info[0] == 2 and sys.version_info[1] == 6:
+    raise SkipTest('MongoEngine is not Python 2.6 compatible as of its 0.11 version.')
+
 from wtforms import fields, validators
 
 from flask_admin import form
-from flask_admin._compat import as_unicode
 from flask_admin.contrib.mongoengine import ModelView
+
 from . import setup
 
+from datetime import datetime
+
 class CustomModelView(ModelView):
     def __init__(self, model,
                  name=None, category=None, endpoint=None, url=None,