Add stage basic tests and model

opentech/apply/tests.py

-from unittest import TestCase
+from django.test import SimpleTestCase
 
-from .workflow import Workflow
+from .workflow import Workflow, Stage
 
 
-class TestWorkflowCreation(TestCase):
+class TestWorkflowCreation(SimpleTestCase):
     def test_can_create_workflow(self):
         name = 'single_stage'
         workflow = Workflow(name)
         self.assertEqual(workflow.name, name)
+
+
+class TestStageCreation(SimpleTestCase):
+    def test_can_create_stage(self):
+        name = 'the_stage'
+        stage = Stage(name)
+        self.assertEqual(stage.name, name)

opentech/apply/workflow.py

 class Workflow:
     def __init__(self, name):
         self.name = name
+
+
+class Stage:
+    def __init__(self, name):
+        self.name = name