From 09956b62190f701fbea0826977ef7de27c39c19f Mon Sep 17 00:00:00 2001
From: Martin Budden <mjbudden@gmail.com>
Date: Sat, 6 Mar 2021 15:36:49 +0000
Subject: [PATCH] Improved resilience of compare_images.

---
 scripts/tests.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/scripts/tests.py b/scripts/tests.py
index 1e52a34..4b6b1d3 100755
--- a/scripts/tests.py
+++ b/scripts/tests.py
@@ -60,7 +60,8 @@ def compare_images(a, b, c):
     with open(log_name, 'w') as output:
         do_cmd(("magick compare -metric AE -fuzz %d%% %s %s %s" % (fuzz, a, b, c)).split(), output = output)
     with open(log_name, 'r') as f:
-        pixels = int(float(f.read().strip()))
+        pixels = f.read().strip()
+        pixels = int(float(pixels if pixels.isnumeric() else -1))
     os.remove(log_name)
     return pixels