1 files changed, 82 insertions, 0 deletions
diff --git a/tests/db_functions/comparison/test_json_object.py b/tests/db_functions/comparison/test_json_object.py
new file mode 100644
index 0000000000..2c7c1beae9
--- /dev/null
+++ b/tests/db_functions/comparison/test_json_object.py
@@ -0,0 +1,82 @@
+from django.db import NotSupportedError
+from django.db.models import F, Value
+from django.db.models.functions import JSONObject, Lower
+from django.test import TestCase
+from django.test.testcases import skipIfDBFeature, skipUnlessDBFeature
+from django.utils import timezone
+
+from ..models import Article, Author
+
+
+@skipUnlessDBFeature('has_json_object_function')
+class JSONObjectTests(TestCase):
+    @classmethod
+    def setUpTestData(cls):
+        Author.objects.create(name='Ivan Ivanov', alias='iivanov')
+
+    def test_empty(self):
+        obj = Author.objects.annotate(json_object=JSONObject()).first()
+        self.assertEqual(obj.json_object, {})
+
+    def test_basic(self):
+        obj = Author.objects.annotate(json_object=JSONObject(name='name')).first()
+        self.assertEqual(obj.json_object, {'name': 'Ivan Ivanov'})
+
+    def test_expressions(self):
+        obj = Author.objects.annotate(json_object=JSONObject(
+            name=Lower('name'),
+            alias='alias',
+            goes_by='goes_by',
+            salary=Value(30000.15),
+            age=F('age') * 2,
+        )).first()
+        self.assertEqual(obj.json_object, {
+            'name': 'ivan ivanov',
+            'alias': 'iivanov',
+            'goes_by': None,
+            'salary': 30000.15,
+            'age': 60,
+        })
+
+    def test_nested_json_object(self):
+        obj = Author.objects.annotate(json_object=JSONObject(
+            name='name',
+            nested_json_object=JSONObject(
+                alias='alias',
+                age='age',
+            ),
+        )).first()
+        self.assertEqual(obj.json_object, {
+            'name': 'Ivan Ivanov',
+            'nested_json_object': {
+                'alias': 'iivanov',
+                'age': 30,
+            },
+        })
+
+    def test_nested_empty_json_object(self):
+        obj = Author.objects.annotate(json_object=JSONObject(
+            name='name',
+            nested_json_object=JSONObject(),
+        )).first()
+        self.assertEqual(obj.json_object, {
+            'name': 'Ivan Ivanov',
+            'nested_json_object': {},
+        })
+
+    def test_textfield(self):
+        Article.objects.create(
+            title='The Title',
+            text='x' * 4000,
+            written=timezone.now(),
+        )
+        obj = Article.objects.annotate(json_object=JSONObject(text=F('text'))).first()
+        self.assertEqual(obj.json_object, {'text': 'x' * 4000})
+
+
+@skipIfDBFeature('has_json_object_function')
+class JSONObjectNotSupportedTests(TestCase):
+    def test_not_supported(self):
+        msg = 'JSONObject() is not supported on this database backend.'
+        with self.assertRaisesMessage(NotSupportedError, msg):
+            Author.objects.annotate(json_object=JSONObject()).get()