refact: move Tribe to own file and rename tools to fakes

tests/model/fakes.py

@@ -3,7 +3,7 @@ from random import choice, randint
 from faker import Faker
 
 from backend.model.assessment import Assessment, Domain, Exercise, Question, Skill
-from backend.model.student import Tribe
+from backend.model.tribe import Tribe
 
 faker = Faker()
 

tests/model/test_assessment.py

@@ -1,6 +1,6 @@
 from random import choice, randint
 
-from .tools import (
+from .fakes import (
     build_tribe_assessment_exercise,
     build_tribe_assessment_exercise_question,
 )

tests/model/test_student.py

@@ -1,7 +1,8 @@
 from random import randint
 
-from backend.model.student import Student, Tribe
-from tests.model.tools import build_tribe_assessment
+from backend.model.student import Student
+from backend.model.tribe import Tribe
+from tests.model.fakes import build_tribe_assessment
 
 
 def test_tribe_register_assessment():