Use Enum for request statuses

tests/domain/test_requests.py

@@ -3,6 +3,7 @@ from uuid import uuid4
 
 from atst.domain.exceptions import NotFoundError
 from atst.domain.requests import Requests
+from atst.models.request_status_event import RequestStatus
 
 from tests.factories import RequestFactory
 
@@ -25,25 +26,25 @@ def test_nonexistent_request_raises():
 
 def test_new_request_has_started_status():
     request = Requests.create(uuid4(), {})
-    assert request.status == "started"
+    assert request.status == RequestStatus.STARTED
 
 
 def test_auto_approve_less_than_1m(new_request):
     new_request.body = {"details_of_use": {"dollar_value": 999999}}
     request = Requests.submit(new_request)
 
-    assert request.status == "pending_financial_verification"
+    assert request.status == RequestStatus.PENDING_FINANCIAL_VERIFICATION
 
 
 def test_dont_auto_approve_if_dollar_value_is_1m_or_above(new_request):
     new_request.body = {"details_of_use": {"dollar_value": 1000000}}
     request = Requests.submit(new_request)
 
-    assert request.status == "pending_ccpo_approval"
+    assert request.status == RequestStatus.PENDING_CCPO_APPROVAL
 
 
 def test_dont_auto_approve_if_no_dollar_value_specified(new_request):
     new_request.body = {"details_of_use": {}}
     request = Requests.submit(new_request)
 
-    assert request.status == "pending_ccpo_approval"
+    assert request.status == RequestStatus.PENDING_CCPO_APPROVAL