Fix and refactor action_required_by

tests/models/test_requests.py

@@ -1,5 +1,21 @@
 from tests.factories import RequestFactory
+from atst.domain.requests import Requests, RequestStatus
 
 
 def test_started_request_requires_mo_action():
     request = RequestFactory.create()
+    assert Requests.action_required_by(request) == "mission_owner"
+
+
+def test_pending_financial_requires_mo_action():
+    request = RequestFactory.create()
+    request = Requests.set_status(request, RequestStatus.PENDING_FINANCIAL_VERIFICATION)
+
+    assert Requests.action_required_by(request) == "mission_owner"
+
+
+def test_pending_ccpo_approval_requires_ccpo():
+    request = RequestFactory.create()
+    request = Requests.set_status(request, RequestStatus.PENDING_CCPO_APPROVAL)
+
+    assert Requests.action_required_by(request) == "ccpo"