Refs #29522 -- Improved test coverage of deserializers.

tests/fixtures_regress/fixtures/sequence_empty_lines_jsonl.jsonl

@@ -0,0 +1,3 @@
+
+
+{"pk": "1", "model": "fixtures_regress.animal", "fields": {"name": "Eagle", "latin_name": "Aquila", "count": 3, "weight": 1.2}}

tests/fixtures_regress/fixtures/sequence_extra_jsonl.jsonl

@@ -0,0 +1,2 @@
+{"pk": "1", "model": "fixtures_regress.animal", "fields": {"name": "Eagle", "extra_name": "Super Eagle", "latin_name": "Aquila", "count": 3, "weight": 1.2}}
+{"pk": "1", "model": "fixtures_regress.animal_extra", "fields": {"name": "Nonexistent model", "extra_name": "test for ticket #29522", "latin_name": "Aquila", "count": 3, "weight": 1.2}}

tests/fixtures_regress/fixtures/sequence_extra_yaml.yaml

@@ -0,0 +1,17 @@
+- pk: "1"
+  model: fixtures_regress.animal
+  fields:
+    name: Cat
+    extra_name: Super Cat
+    latin_name: Felis catus
+    count: 3
+    weight: 1.2
+
+- pk: "1"
+  model: fixtures_regress.animal_extra
+  fields:
+    name: Nonexistent model
+    extra_name: test for ticket \#29522
+    latin_name: Felis catus
+    count: 3
+    weight: 1.2

tests/fixtures_regress/tests.py

@@ -96,10 +96,18 @@ class TestFixtures(TestCase):
         the serialized data for fields that have been removed
         from the database when not ignored.
         """
-        with self.assertRaises(DeserializationError):
+        for fixture_file in (
+            "sequence_extra",
+            "sequence_extra_jsonl",
+            "sequence_extra_yaml",
+        ):
+            with (
+                self.subTest(fixture_file=fixture_file),
+                self.assertRaises(DeserializationError),
+            ):
                 management.call_command(
                     "loaddata",
-                "sequence_extra",
+                    fixture_file,
                     verbosity=0,
                 )
 
@@ -130,6 +138,32 @@ class TestFixtures(TestCase):
         )
         self.assertEqual(Animal.specimens.all()[0].name, "Wolf")
 
+    def test_loaddata_not_found_fields_ignore_jsonl(self):
+        management.call_command(
+            "loaddata",
+            "sequence_extra_jsonl",
+            ignore=True,
+            verbosity=0,
+        )
+        self.assertEqual(Animal.specimens.all()[0].name, "Eagle")
+
+    def test_loaddata_not_found_fields_ignore_yaml(self):
+        management.call_command(
+            "loaddata",
+            "sequence_extra_yaml",
+            ignore=True,
+            verbosity=0,
+        )
+        self.assertEqual(Animal.specimens.all()[0].name, "Cat")
+
+    def test_loaddata_empty_lines_jsonl(self):
+        management.call_command(
+            "loaddata",
+            "sequence_empty_lines_jsonl.jsonl",
+            verbosity=0,
+        )
+        self.assertEqual(Animal.specimens.all()[0].name, "Eagle")
+
     @skipIfDBFeature("interprets_empty_strings_as_nulls")
     def test_pretty_print_xml(self):
         """