add basic tests for osm plugin

tests/python_tests/osm_test.py

@@ -0,0 +1,46 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+from nose.tools import *
+from utilities import execution_path
+
+import os, mapnik
+
+def setup():
+    # All of the paths used are relative, if we run the tests
+    # from another directory we need to chdir()
+    os.chdir(execution_path('.'))
+
+if 'osm' in mapnik.DatasourceCache.instance().plugin_names():
+    
+    # Shapefile initialization
+    def test_osm_init():
+        ds = mapnik.Osm(file='../data/osm/nodes.osm')
+    
+        e = ds.envelope()
+       
+        # these are hardcoded in the plugin… ugh
+        assert_almost_equal(e.minx, -180.0)
+        assert_almost_equal(e.miny, -90.0)
+        assert_almost_equal(e.maxx, 180.0)
+        assert_almost_equal(e.maxy, 90)
+    
+    @raises(RuntimeError)
+    def test_that_nonexistant_query_field_throws(**kwargs):
+        ds = mapnik.Osm(file='../data/osm/nodes.osm')
+        # ugh, more odd stuff hardcoded...
+        eq_(len(ds.fields()),5)
+        eq_(ds.fields(),['bicycle', 'foot', 'horse', 'name', 'width'])
+        eq_(ds.field_types(),['str', 'str', 'str', 'str', 'str'])
+        query = mapnik.Query(ds.envelope())
+        for fld in ds.fields():
+            query.add_property_name(fld)
+        # also add an invalid one, triggering throw
+        query.add_property_name('bogus')
+        fs = ds.features(query)
+
+
+if __name__ == "__main__":
+    setup()
+    [eval(run)() for run in dir() if 'test_' in run]
+