Add Users.get_by_dod_id

tests/domain/test_users.py

@@ -2,7 +2,7 @@ import pytest
 from uuid import uuid4
 
 from atst.domain.users import Users
-from atst.domain.exceptions import NotFoundError, AlreadyExistsError
+from atst.domain.exceptions import NotFoundError
 
 
 
@@ -41,6 +41,12 @@ def test_get_nonexistent_user():
         Users.get(uuid4())
 
 
+def test_get_user_by_dod_id():
+    new_user = Users.create("developer", dod_id="my_dod_id")
+    user = Users.get_by_dod_id("my_dod_id")
+    assert user == new_user
+
+
 def test_update_user():
     new_user = Users.create("developer")
     updated_user = Users.update(new_user.id, "ccpo")