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import os
import mapnik
import pytest
from .utilities import execution_path
@pytest.fixture(scope="module")
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('.'))
yield
if 'sqlite' in mapnik.DatasourceCache.plugin_names():
# the negative buffer on the layer should
# override the postive map buffer leading
# only one point to be rendered in the map
def test_layer_buffer_size_1(setup):
if not os.path.exists('../data/good_maps/layer_buffer_size_reduction.xml'):
pytest.skip('Missing data')
m = mapnik.Map(512, 512)
assert m.buffer_size == 0
mapnik.load_map(m, '../data/good_maps/layer_buffer_size_reduction.xml')
assert m.buffer_size == 256
assert m.layers[0].buffer_size == -150
m.zoom_all()
im = mapnik.Image(m.width, m.height)
mapnik.render(m, im)
actual = '/tmp/mapnik-layer-buffer-size.png'
expected = 'images/support/mapnik-layer-buffer-size.png'
im.save(actual, "png32")
expected_im = mapnik.Image.open(expected)
assert im.tostring('png32') == expected_im.tostring('png32'),'failed comparing actual (%s) and expected (%s)' % (actual,'tests/python_tests/' + expected)
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