use tempfile modules to construct temporary paths (which should be compatible with windows)

tests/python_tests/object_test.py

@@ -5,6 +5,7 @@ import os
 from nose.tools import *
 from utilities import execution_path
 from utilities import Todo
+import tempfile
 
 import mapnik, pickle
 
@@ -365,11 +366,13 @@ def test_map_init_from_string():
         eq_(m.base, './')
         mapnik.load_map_from_string(m, map_string, False, "") # this "" will have no effect
         eq_(m.base, './')
+        
+        tmp_dir = tempfile.gettempdir()
         try:
-            mapnik.load_map_from_string(m, map_string, False, "/tmp")
+            mapnik.load_map_from_string(m, map_string, False, tmp_dir)
         except RuntimeError:
             pass # runtime error expected because shapefile path should be wrong and datasource will throw
-        eq_(m.base, '/tmp') # /tmp will be set despite the exception because load_map mostly worked
+        eq_(m.base, tmp_dir) # tmp_dir will be set despite the exception because load_map mostly worked
         m.base = 'foo'
         mapnik.load_map_from_string(m, map_string, True, ".")
         eq_(m.base, '.')

tests/python_tests/render_test.py

@@ -2,10 +2,9 @@
 # -*- coding: utf-8 -*-
 
 from nose.tools import *
-
+import tempfile
 import os, mapnik
 from nose.tools import *
-
 from utilities import execution_path
 from utilities import Todo
 
@@ -216,7 +215,7 @@ def test_render_points():
         p = mapnik.Projection(projs[projdescr])
         m.zoom_to_box(p.forward(mapnik.Box2d(ul_lonlat,lr_lonlat)))
         # Render to SVG so that it can be checked how many points are there with string comparison
-        svg_file = '/tmp/%s.svg'
+        svg_file = os.path.join(tempfile.gettempdir(),'%s.svg')
         mapnik.render_to_file(m, svg_file)
         num_points_present = len(places_ds.all_features())
         svg = open(svg_file,'r').read()