Refs #35464 -- Added test to cover layout of TabularInline fieldsets.

tests/admin_inlines/admin.py

@@ -106,14 +106,18 @@ class PhotoInlineMixin:
     model = Photo
     extra = 2
     fieldsets = [
-        (None, {"fields": ["image", "title"]}),
+        (None, {"fields": ["image", "title"], "description": "First group"}),
         (
             "Details",
-            {"fields": ["description", "creation_date"], "classes": ["collapse"]},
+            {
+                "fields": ["description", "creation_date"],
+                "classes": ["collapse"],
+                "description": "Second group",
+            },
         ),
         (
             "Details",  # Fieldset name intentionally duplicated
-            {"fields": ["update_date", "updated_by"]},
+            {"fields": ["update_date", "updated_by"], "description": "Third group"},
         ),
     ]
 

tests/admin_inlines/tests.py

@@ -2422,3 +2422,39 @@ class SeleniumTests(AdminSeleniumTestCase):
                 )
                 self.assertEqual(available.text, "AVAILABLE ATTENDANT")
                 self.assertEqual(chosen.text, "CHOSEN ATTENDANT")
+
+    def test_tabular_inline_layout(self):
+        from selenium.webdriver.common.by import By
+
+        self.admin_login(username="super", password="secret")
+        self.selenium.get(
+            self.live_server_url + reverse("admin:admin_inlines_photographer_add")
+        )
+        tabular_inline = self.selenium.find_element(
+            By.CSS_SELECTOR, "[data-inline-type='tabular']"
+        )
+        headers = tabular_inline.find_elements(By.TAG_NAME, "th")
+        self.assertEqual(
+            [h.get_attribute("innerText") for h in headers],
+            [
+                "",
+                "IMAGE",
+                "TITLE",
+                "DESCRIPTION",
+                "CREATION DATE",
+                "UPDATE DATE",
+                "UPDATED BY",
+                "DELETE?",
+            ],
+        )
+        # There are no fieldset section names rendered.
+        self.assertNotIn("Details", tabular_inline.text)
+        # There are no fieldset section descriptions rendered.
+        self.assertNotIn("First group", tabular_inline.text)
+        self.assertNotIn("Second group", tabular_inline.text)
+        self.assertNotIn("Third group", tabular_inline.text)
+        # There are no fieldset classes applied.
+        self.assertEqual(
+            tabular_inline.find_elements(By.CSS_SELECTOR, ".collapse"),
+            [],
+        )