mapnik/tests/python_tests/save_map_test.py

#!/usr/bin/env python

from nose.tools import *
from utilities import execution_path, run_all, datasources_available
import tempfile

import os, sys, glob, mapnik

default_logging_severity = mapnik.logger.get_severity()

def setup():
    # make the tests silent to suppress unsupported params from harfbuzz tests
    # TODO: remove this after harfbuzz branch merges
    mapnik.logger.set_severity(mapnik.severity_type.None)
    # All of the paths used are relative, if we run the tests
    # from another directory we need to chdir()
    os.chdir(execution_path('.'))

def teardown():
    mapnik.logger.set_severity(default_logging_severity)

def compare_map(xmlfile):
    missing_plugins = set()
    have_inputs = datasources_available(xmlfile, missing_plugins)
    if not have_inputs:
        print 'Notice: skipping saved map comparison for %s due to unavailable input plugins: %s' % (os.path.basename(xmlfile), list(missing_plugins))
        return False

    m = mapnik.Map(256, 256)
    absolute_base = os.path.abspath(os.path.dirname(xmlfile))
    mapnik.load_map(m, xmlfile, True, absolute_base)
    (handle, test_map) = tempfile.mkstemp(suffix='.xml', prefix='mapnik-temp-map1-')
    os.close(handle)
    (handle, test_map2) = tempfile.mkstemp(suffix='.xml', prefix='mapnik-temp-map2-')
    os.close(handle)
    if os.path.exists(test_map):
        os.remove(test_map)
    mapnik.save_map(m, test_map)
    new_map = mapnik.Map(256, 256)
    mapnik.load_map(new_map, test_map, True, absolute_base)
    open(test_map2, 'w').write(mapnik.save_map_to_string(new_map))
    diff = ' diff %s %s' % (os.path.abspath(test_map),os.path.abspath(test_map2))
    try:
        eq_(open(test_map).read(), open(test_map2).read())
    except AssertionError, e:
        raise AssertionError('serialized map "%s" not the same after being reloaded, \ncompare with command:\n\n$%s' % (xmlfile, diff))

    if os.path.exists(test_map):
        os.remove(test_map)
    else:
        # Fail, the map wasn't written
        return False

def test_compare_map():
    good_maps = glob.glob("../data/good_maps/*.xml")
    for m in good_maps:
        compare_map(m)

    for m in glob.glob("../visual_tests/styles/*.xml"):
        compare_map(m)

if __name__ == "__main__":
    setup()
    exit(run_all(eval(x) for x in dir() if x.startswith("test_")))