From: Daniele Varrazzo <daniele.varrazzo@gmail.com>
Date: Wed, 23 Jun 2021 12:10:57 +0000 (+0100)
Subject: Fix rounding error in float comparison tests with postgres < 12
X-Git-Tag: 3.0.dev0~18^2~2
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=359e0e81a8e9d7adea7de5ee7fca1eb09bd7be7c;p=thirdparty%2Fpsycopg.git

Fix rounding error in float comparison tests with postgres < 12
---

diff --git a/tests/fix_faker.py b/tests/fix_faker.py
index 9c20e3689..e10b02730 100644
--- a/tests/fix_faker.py
+++ b/tests/fix_faker.py
@@ -318,7 +318,13 @@ class Faker:
         if got is not None and isnan(got):
             assert isnan(want)
         else:
-            assert got == want
+            # Versions older than 12 make some rounding. e.g. in Postgres 10.4
+            # select '-1.409006204063909e+112'::float8
+            #      -> -1.40900620406391e+112
+            if self.conn.info.server_version >= 120000:
+                assert got == want
+            else:
+                assert got == pytest.approx(want)
 
     def make_int(self, spec):
         return randrange(-(1 << 90), 1 << 90)