Added tests for status code 425 definitions.
diff --git a/tests/test_requests.py b/tests/test_requests.py
index a71fe7d..0ac3092 100644
--- a/tests/test_requests.py
+++ b/tests/test_requests.py
@@ -2795,3 +2795,16 @@
         with pytest.raises(requests.exceptions.JSONDecodeError) as excinfo:
             r.json()
         assert excinfo.value.doc == r.text
+
+    def test_status_code_425(self):
+        r1 = requests.codes.get("TOO_EARLY")
+        r2 = requests.codes.get("too_early")
+        r3 = requests.codes.get("UNORDERED")
+        r4 = requests.codes.get("unordered")
+        r5 = requests.codes.get("UNORDERED_COLLECTION")
+        r6 = requests.codes.get("unordered_collection")
+
+        assert r1 == 425
+        assert r2 == 425
+        assert r3 == 425
+        assert r4 == 425