added tests for rememberme and workout files

backend/secfit/users/tests/__init__.py

 from users.tests.registration import *
 from users.tests.userserializer import *
-from users.tests.twowaydomain import *
\ No newline at end of file
+from users.tests.twowaydomain import *
+from users.tests.rememberme import *
\ No newline at end of file

backend/secfit/users/tests/registration.py

 import json
 
 from django.test import TestCase, RequestFactory, Client
-from users.serializers import UserSerializer
 from users.models import User
 
 url = "/api/users/"

backend/secfit/users/tests/rememberme.py

+import json
+
+from django.test import TestCase, RequestFactory, Client
+from rest_framework.test import APIRequestFactory, APIClient
+from users.serializers import UserSerializer
+from users.models import User
+from workouts.views import RememberMe
+
+url = '/api/remember_me/'
+
+class RemembermeTestCase(TestCase):
+    """Django test for the rememberme functionality
+
+    tests:
+        set_up:                 Set up everything needed for the test
+        test_rememberme: Tests creation of rememberme for authenticated user
+    """
+
+    def setUp(self):
+        self.client = APIClient()
+        self.user = User.objects.create(username="user",password="test")
+        self.client.force_authenticate(user=self.user)
+
+    def test_rememberme(self):
+        data = {"username": "user", "password": "test"}
+        response = self.client.get(url, data)
+        self.assertEqual(response.status_code, 200)
\ No newline at end of file

backend/secfit/workouts/tests/__init__.py

 from workouts.tests.permissions import *
 from workouts.tests.workouts import *
 from workouts.tests.visibility import *
-from workouts.tests.features import *
\ No newline at end of file
+from workouts.tests.features import *
+from workouts.tests.workoutfiles import *

backend/secfit/workouts/tests/workoutfiles.py

+import json
+
+from django.test import TestCase, RequestFactory, Client
+from rest_framework.test import APIRequestFactory, APIClient
+from workouts.models import Workout, Exercise, ExerciseInstance, WorkoutFile
+from workouts.serializers import WorkoutSerializer
+from users.models import User
+
+class WorkoutFilesTestCase(TestCase):
+    """Django test for perserving the functionality of workout-files
+
+    tests:
+        set_up:                 Set up everything needed for the test
+    """
+    def setUp(self):
+        self.user = User.objects.create(username="user")
+        self.workout = Workout.objects.create(name="workout", date="2021-03-06T18:00:00Z", notes="note", owner=self.user, visibility="PU")
+        self.exercise = Exercise.objects.create(name="exercise", description="test", unit="test")
+        
+    def test_workout_files(self):
+        data = {'name': 'workout', 'notes': 'note', 'visibility': 'PU',
+                    'date': '2021-03-06T18:00:00.000Z', 
+                    'exercise_instances': [{'exercise': self.exercise, 'sets':12, 'number':12}],
+                    'files': [{'owner': self.user, 'file':'workouts/1/document.pdf'}]
+        }
+        WorkoutSerializer(data).update(self.workout, data)
+
+        instance = ExerciseInstance.objects.filter(workout=self.workout).first()
+        self.assertEqual(instance.exercise, self.exercise)
+
+        files = WorkoutFile.objects.filter(workout=self.workout).first()
+        self.assertEqual(files.owner, self.user)
+        self.assertEqual(files.file, 'workouts/1/document.pdf')