fix mongoengine tests

flask_admin/tests/mongoengine/__init__.py

+from nose.plugins.skip import SkipTest
+from wtforms import __version__ as wtforms_version
+
+# Skip test on PY3
+from flask_admin._compat import PY2
+if not PY2:
+    raise SkipTest('MongoEngine is not Python 3 compatible')
+
+if int(wtforms_version[0]) < 2:
+    raise SkipTest('MongoEngine does not support WTForms 1.')
+
 from flask import Flask
 from flask_admin import Admin
 from flask_mongoengine import MongoEngine

flask_admin/tests/mongoengine/test_basic.py

 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')
 
 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,