skip TestWorkflows if pymongo not installed

pypushflow/test/test_Workflows.py

@@ -26,16 +26,22 @@ __date__ = "28/05/2019"
 import os
 import logging
 import unittest
-
 from pypushflow.test.TestWorkflow import Workflow1
 from pypushflow.test.TestWorkflow import Workflow2
 from pypushflow.test.TestWorkflow import Workflow3
+try:
+    import pymongo
+except ImportError:
+    _has_pymongo = False
+else:
+    _has_pymongo = True
 
 
 logging.basicConfig(level=logging.DEBUG)
 logger = logging.getLogger('testWorkflow')
 
 
+@unittest.skipUnless(_has_pymongo, 'need pymongo install')
 class TestWorkflows(unittest.TestCase):
 
     def setUp(self):