From 19ed8718a3a5deb2aaa7d594e7b2a20c516f8e46 Mon Sep 17 00:00:00 2001
From: Hermann Kraus <hermr2d2@gmail.com>
Date: Sun, 29 Jul 2012 01:47:16 +0200
Subject: [PATCH] Fix test crashes when reference image doesn't exists. Refs
 #1296 and commit 269569250c5b6535f2fdb3e5116050599ca21c70

---
 tests/visual_tests/compare.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/tests/visual_tests/compare.py b/tests/visual_tests/compare.py
index 98edde22a..8fa26360e 100644
--- a/tests/visual_tests/compare.py
+++ b/tests/visual_tests/compare.py
@@ -12,7 +12,6 @@ passed = 0
 def compare_pixels(pixel1, pixel2):
     if pixel1 == pixel2:
         return False
-    # will only work on little endian
     r_diff = abs((pixel1 & 0xff) - (pixel2 & 0xff))
     g_diff = abs(((pixel1 >> 8) & 0xff) - ((pixel2 >> 8) & 0xff))
     b_diff = abs(((pixel1 >> 16) & 0xff)- ((pixel2 >> 16) & 0xff))
@@ -32,7 +31,7 @@ def compare(actual, expected):
     im1 = mapnik.Image.open(actual)
     try:
         im2 = mapnik.Image.open(expected)
-    except IOError:
+    except RuntimeError:
         errors.append((None, actual, expected))
         return -1
     diff = 0