[RED] creating 2 test for removing exif data in image. Adding folder: test_files and utils in app

app/tests.py

-import json
+import json, tempfile, os
 from io import StringIO
 
+from django.conf import settings
 from django.contrib.auth import get_user_model
 from django.core.exceptions import PermissionDenied, ValidationError
 from django.core.files.uploadedfile import SimpleUploadedFile
@@ -19,6 +20,7 @@ from .views import (DaftarKatalog, DashboardKontributorView, DetailMateri,
                     SuksesLoginKontributorView, SuntingProfilView,
                     ProfilAdminView, PostsView, SuntingProfilAdminView, RevisiMateriView)
 from app.forms import SuntingProfilForm
+from app.utils.fileManagementUtil import get_random_filename, remove_image_exifdata
 
 
 class DaftarKatalogTest(TestCase):
@@ -1128,3 +1130,31 @@ class RatingMateriTest(TestCase):
     def test_score_in_rating_should_not_be_null(self):
         with self.assertRaises(TypeError):
             Rating(materi=self.materi1, user=self.user_one).save()
+
+
+class fileManagementUtilTest(TestCase):
+    def setUp(self):
+        self.filename = "image_with_exif_data.gif"
+        self.file_content = open(settings.BASE_DIR + "/app/test_files/" +
+                self.filename, "rb").read()
+
+    def test_get_random_filename_isCorrect(self):
+        generated_name = get_random_filename(self.filename)
+
+        self.assertTrue(generated_name != self.filename)
+        # 40 from 36 expected name length + 4 from extension
+        self.assertEqual(len(generated_name), 40)
+        self.assertTrue(generated_name[-4:] == ".gif")
+
+    def test_remove_image_exifdata_isCorrect(self):
+        with tempfile.TemporaryDirectory() as d:
+            image_with_exif_data_path = os.path.join(d, self.filename)
+            img = open(image_with_exif_data_path, "wb")
+            img.write(self.file_content)
+            img.close()
+
+            remove_image_exifdata(image_with_exif_data_path)
+            sanitized_img = open(image_with_exif_data_path, "rb").read()
+
+            self.assertTrue(len(sanitized_img) < len(self.file_content))
+            self.assertTrue(b'<exif:' not in sanitized_img)