[1.7.x] Fixed #23770 -- Changed serialization strategy for floats with respect to NaN and Inf

Thanks to w0rp for the report

Backport of c7c098cf97fbb1416f302c76799058ad63a5f7aa from master.

1 files changed, 5 insertions, 0 deletions

diff --git a/tests/migrations/test_writer.py b/tests/migrations/test_writer.py
index 0503270ed2..cb9ed5d0d5 100644
--- a/tests/migrations/test_writer.py
+++ b/tests/migrations/test_writer.py
@@ -2,6 +2,7 @@
 from __future__ import unicode_literals
 
 import datetime
+import math
 import os
 import re
 import tokenize
@@ -69,6 +70,10 @@ class WriterTests(TestCase):
         """
         # Basic values
         self.assertSerializedEqual(1)
+        self.assertSerializedEqual(1.2)
+        self.assertTrue(math.isinf(self.serialize_round_trip(float("inf"))))
+        self.assertTrue(math.isinf(self.serialize_round_trip(float("-inf"))))
+        self.assertTrue(math.isnan(self.serialize_round_trip(float("nan"))))
         self.assertSerializedEqual(None)
         self.assertSerializedEqual(b"foobar")
         string, imports = MigrationWriter.serialize(b"foobar")