✅(backend) fix randomly failing test due to delay before check

There is a delay between the time the signature is issued and the
time it is checked. Although this delay is minimal, if the signature
is issued at the end of a second, both timestamps can differ of 1s.

> assert response["X-Amz-Date"] == timezone.now().strftime("%Y%m%dT%H%M%SZ")
AssertionError: assert equals failed '20250504T175307Z'  '20250504T175308Z'

Author: sampaccoud

src/backend/core/tests/documents/test_api_documents_duplicate.py

@@ -14,6 +14,7 @@
 import pycrdt
 import pytest
 import requests
+from freezegun import freeze_time
 from rest_framework.test import APIClient
 
 from core import factories, models
@@ -133,19 +134,21 @@ def test_api_documents_duplicate_success(index):
 
     # Ensure access persists after the owner loses access to the original document
     models.DocumentAccess.objects.filter(document=document).delete()
-    response = client.get(
-        "/api/v1.0/documents/media-auth/", HTTP_X_ORIGINAL_URL=image_refs[0][1]
-    )
 
-    assert response.status_code == 200
+    now = timezone.now()
+    with freeze_time(now):
+        response = client.get(
+            "/api/v1.0/documents/media-auth/", HTTP_X_ORIGINAL_URL=image_refs[0][1]
+        )
 
+    assert response.status_code == 200
+    assert response["X-Amz-Date"] == now.strftime("%Y%m%dT%H%M%SZ")
     authorization = response["Authorization"]
     assert "AWS4-HMAC-SHA256 Credential=" in authorization
     assert (
         "SignedHeaders=host;x-amz-content-sha256;x-amz-date, Signature="
         in authorization
     )
-    assert response["X-Amz-Date"] == timezone.now().strftime("%Y%m%dT%H%M%SZ")
 
     s3_url = urlparse(settings.AWS_S3_ENDPOINT_URL)
     response = requests.get(

src/backend/core/tests/documents/test_api_documents_media_auth.py

@@ -12,6 +12,7 @@
 
 import pytest
 import requests
+from freezegun import freeze_time
 from rest_framework.test import APIClient
 
 from core import factories, models
@@ -50,9 +51,11 @@ def test_api_documents_media_auth_anonymous_public():
     factories.DocumentFactory(id=document_id, link_reach="public", attachments=[key])
 
     original_url = f"http://localhost/media/{key:s}"
-    response = APIClient().get(
-        "/api/v1.0/documents/media-auth/", HTTP_X_ORIGINAL_URL=original_url
-    )
+    now = timezone.now()
+    with freeze_time(now):
+        response = APIClient().get(
+            "/api/v1.0/documents/media-auth/", HTTP_X_ORIGINAL_URL=original_url
+        )
 
     assert response.status_code == 200
 
@@ -62,7 +65,7 @@ def test_api_documents_media_auth_anonymous_public():
         "SignedHeaders=host;x-amz-content-sha256;x-amz-date, Signature="
         in authorization
     )
-    assert response["X-Amz-Date"] == timezone.now().strftime("%Y%m%dT%H%M%SZ")
+    assert response["X-Amz-Date"] == now.strftime("%Y%m%dT%H%M%SZ")
 
     s3_url = urlparse(settings.AWS_S3_ENDPOINT_URL)
     file_url = f"{settings.AWS_S3_ENDPOINT_URL:s}/impress-media-storage/{key:s}"