Fixed #29188 -- Fixed ContentFile.size after a write().

1 files changed, 10 insertions, 0 deletions

diff --git a/tests/files/tests.py b/tests/files/tests.py
index 3999794154..663d2d976f 100644
--- a/tests/files/tests.py
+++ b/tests/files/tests.py
@@ -206,6 +206,16 @@ class ContentFileTestCase(unittest.TestCase):
         with file.open() as f:
             self.assertEqual(f.read(), b'content')
 
+    def test_size_changing_after_writing(self):
+        """ContentFile.size changes after a write()."""
+        f = ContentFile('')
+        self.assertEqual(f.size, 0)
+        f.write('Test ')
+        f.write('string')
+        self.assertEqual(f.size, 11)
+        with f.open() as fh:
+            self.assertEqual(fh.read(), 'Test string')
+
 
 class InMemoryUploadedFileTests(unittest.TestCase):
     def test_open_resets_file_to_start_and_returns_context_manager(self):