1 files changed, 48 insertions, 0 deletions
diff --git a/tests/invalid_models_tests/test_models.py b/tests/invalid_models_tests/test_models.py
index 5780704eae..2a39e250bd 100644
--- a/tests/invalid_models_tests/test_models.py
+++ b/tests/invalid_models_tests/test_models.py
@@ -166,6 +166,54 @@ class UniqueTogetherTests(SimpleTestCase):
             ],
         )
 
+    def test_pointing_to_foreign_object(self):
+        class Reference(models.Model):
+            reference_id = models.IntegerField(unique=True)
+
+        class ReferenceTab(models.Model):
+            reference_id = models.IntegerField()
+            reference = models.ForeignObject(
+                Reference,
+                from_fields=["reference_id"],
+                to_fields=["reference_id"],
+                on_delete=models.CASCADE,
+            )
+
+            class Meta:
+                unique_together = [["reference"]]
+
+        self.assertEqual(ReferenceTab.check(), [])
+
+    def test_pointing_to_foreign_object_multi_column(self):
+        class Reference(models.Model):
+            reference_id = models.IntegerField(unique=True)
+            code = models.CharField(max_length=1)
+
+        class ReferenceTabMultiple(models.Model):
+            reference_id = models.IntegerField()
+            code = models.CharField(max_length=1)
+            reference = models.ForeignObject(
+                Reference,
+                from_fields=["reference_id", "code"],
+                to_fields=["reference_id", "code"],
+                on_delete=models.CASCADE,
+            )
+
+            class Meta:
+                unique_together = [["reference"]]
+
+        self.assertEqual(
+            ReferenceTabMultiple.check(),
+            [
+                Error(
+                    "'unique_together' refers to a ForeignObject 'reference' with "
+                    "multiple 'from_fields', which is not supported for that option.",
+                    obj=ReferenceTabMultiple,
+                    id="models.E049",
+                ),
+            ],
+        )
+
 
 @isolate_apps("invalid_models_tests")
 class IndexesTests(TestCase):