hook up visual tests to the 'make test' target

Makefile

@@ -19,6 +19,7 @@ uninstall:
 
 test:
 	@python tests/run_tests.py -q
+	@python tests/visual_tests/test.py
 
 pep8:
 	# https://gist.github.com/1903033

tests/visual_tests/compare.py

@@ -42,13 +42,17 @@ def compare(fn1, fn2):
 
 def summary():
     global errors
+    print "-"*80
+    print "Summary:"
     if len(errors) != 0:
-        print "-"*80
-        print "Summary:"
         for error in errors:
             if (error[1] is None):
                 print "Could not verify %s: No reference image found!" % error[0]
             else:
                 print "%s failed: %d different pixels" % error
         print "-"*80
         sys.exit(1)
+    else:
+        print 'No errors detected!'
+        print "-"*80
+        sys.exit(0)

tests/visual_tests/test.py

@@ -19,6 +19,7 @@
     (499, 100), (500, 100), (501, 100), (502, 100), (505, 100), (510, 100)]
 
 dirname = os.path.dirname(__file__)
+
 files = [
     {'name': "list", 'sizes': sizes_many_in_big_range},
     {'name': "simple", 'sizes': sizes_many_in_big_range},

tests/visual_tests/test_python.py

@@ -4,6 +4,8 @@
 import os.path
 from compare import compare, summary
 
+dirname = os.path.dirname(__file__)
+
 class MyText(mapnik.FormattingNode):
     def __init__(self):
         mapnik.FormattingNode.__init__(self)
@@ -69,7 +71,7 @@ def add_expressions(self, output):
 
 
 layer = mapnik.Layer('Layer')
-layer.datasource = mapnik.Shapefile(file="data/points.shp")
+layer.datasource = mapnik.Shapefile(file=os.path.join(dirname,"data/points.shp"))
 layer.styles.append('Style')
 m.layers.append(layer)
 
@@ -97,9 +99,9 @@ def add_expressions(self, output):
 
 for format_tree in format_trees:
     text.placements.defaults.format_tree = format_tree[1]
-    mapnik.render_to_file(m, os.path.join("images", 'python-%s.png' % format_tree[0]), 'png')
-    compare(os.path.join("images", 'python-%s.png' % format_tree[0]),
-            os.path.join("images", 'python-%s-reference.png' % format_tree[0])
+    mapnik.render_to_file(m, os.path.join(dirname,"images", 'python-%s.png' % format_tree[0]), 'png')
+    compare(os.path.join(dirname,"images", 'python-%s.png' % format_tree[0]),
+            os.path.join(dirname,"images", 'python-%s-reference.png' % format_tree[0])
             )
 
 summary()