Convert Users, Roles, WorkspaceUsers, TaskOrders to use classmethods

tests/domain/test_roles.py

@@ -3,21 +3,16 @@ from atst.domain.roles import Roles
 from atst.domain.exceptions import NotFoundError
 
 
-@pytest.fixture()
-def roles_repo(session):
-    return Roles(session)
-
-
-def test_get_all_roles(roles_repo):
-    roles = roles_repo.get_all()
+def test_get_all_roles():
+    roles = Roles.get_all()
     assert roles
 
 
-def test_get_existing_role(roles_repo):
-    role = roles_repo.get("developer")
+def test_get_existing_role():
+    role = Roles.get("developer")
     assert role.name == "developer"
 
 
-def test_get_nonexistent_role(roles_repo):
+def test_get_nonexistent_role():
     with pytest.raises(NotFoundError):
-        roles_repo.get("nonexistent")
+        Roles.get("nonexistent")