Add hook into CSP when deleting an environment role

atst/domain/csp/cloud.py

@@ -18,6 +18,13 @@ class CloudProviderInterface:
         """
         raise NotImplementedError()
 
+    def delete_role(self, environment_role):  # pragma: no cover
+        """Takes an `atst.model.EnvironmentRole` object and performs any action
+        necessary in the CSP to remove the specified user from the specified
+        environment. This method does not return anything.
+        """
+        raise NotImplementedError()
+
 
 class MockCloudProvider(CloudProviderInterface):
     def create_application(self, name):
@@ -28,3 +35,7 @@ class MockCloudProvider(CloudProviderInterface):
     def create_role(self, environment_role):
         # Currently, there is nothing to mock out, so just do nothing.
         pass
+
+    def delete_role(self, environment_role):
+        # Currently nothing to do.
+        pass

atst/domain/environment_roles.py

@@ -27,6 +27,7 @@ class EnvironmentRoles(object):
     def delete(cls, user_id, environment_id):
         existing_env_role = EnvironmentRoles.get(user_id, environment_id)
         if existing_env_role:
+            app.csp.cloud.delete_role(existing_env_role)
             db.session.delete(existing_env_role)
             db.session.commit()
             return True