improve the linked cases editor

atlas/tests/test_cases.py

@@ -1,9 +1,10 @@
 import json
+import datetime
 
 from django.http import HttpResponse
 from django.urls import reverse
 import pytest
-from atlas.models import CaseCollection, Finding, Condition
+from atlas.models import Case, CaseCollection, Finding, Condition
 #from atlas.views import GenericExamViews
 from pytest_django.asserts import assertRedirects, assertContains, assertQuerySetEqual
 from django.test import TestCase
@@ -179,3 +180,56 @@ def test_linked_cases_overview_can_copy_study_date_to_chain(client, create_user,
 
     assert str(case1.study_date) == "2026-01-10"
     assert str(case2.study_date) == "2026-01-10"
+
+
+@pytest.mark.django_db
+def test_case_save_auto_populates_study_date_when_missing(monkeypatch, make_case):
+    expected_date = datetime.date(2026, 2, 14)
+    monkeypatch.setattr(Case, "_get_series_study_date", lambda self: expected_date)
+
+    case = make_case(title="Autodate Case")
+    case.study_date = None
+    case.save(update_fields=["study_date"])
+    case.refresh_from_db()
+
+    assert case.study_date == expected_date
+
+
+@pytest.mark.django_db
+def test_case_save_preserves_manual_study_date(monkeypatch, make_case):
+    manual_date = datetime.date(2026, 3, 1)
+    monkeypatch.setattr(Case, "_get_series_study_date", lambda self: datetime.date(2026, 4, 1))
+
+    case = make_case(title="Manual Date Case")
+    case.study_date = manual_date
+    case.save(update_fields=["study_date"])
+    case.refresh_from_db()
+
+    assert case.study_date == manual_date
+
+
+@pytest.mark.django_db
+def test_linked_cases_editor_is_hidden_until_requested(client, create_user, make_case):
+    user = create_user
+    case1 = make_case(title="Case 1")
+    case2 = make_case(title="Case 2")
+    case2.previous_case = case1
+    case2.save(update_fields=["previous_case"])
+
+    case1.author.add(user)
+    case2.author.add(user)
+
+    client.force_login(user)
+
+    response_default = client.get(
+        reverse("atlas:linked_cases_overview", kwargs={"case_id": case1.pk})
+    )
+    assert response_default.status_code == 200
+    assertContains(response_default, "Open case series editor")
+    assert "Case Series Editor" not in response_default.content.decode("utf-8")
+
+    response_with_editor = client.get(
+        reverse("atlas:linked_cases_overview", kwargs={"case_id": case1.pk}) + "?show_editor=1"
+    )
+    assert response_with_editor.status_code == 200
+    assertContains(response_with_editor, "Case Series Editor")