QGIS_Layman/test/test_qgis_environment.py

# coding=utf-8
"""Tests for QGIS functionality.


.. note:: This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 2 of the License, or
     (at your option) any later version.

"""
__author__ = 'tim@linfiniti.com'
__date__ = '20/01/2011'
__copyright__ = ('Copyright 2012, Australia Indonesia Facility for '
                 'Disaster Reduction')

import os
import unittest
from qgis.core import (
    QgsProviderRegistry,
    QgsCoordinateReferenceSystem,
    QgsRasterLayer)

from .utilities import get_qgis_app
QGIS_APP = get_qgis_app()


class QGISTest(unittest.TestCase):
    """Test the QGIS Environment"""

    def test_qgis_environment(self):
        """QGIS environment has the expected providers"""

        r = QgsProviderRegistry.instance()
        self.assertIn('gdal', r.providerList())
        self.assertIn('ogr', r.providerList())
        self.assertIn('postgres', r.providerList())

    def test_projection(self):
        """Test that QGIS properly parses a wkt string.
        """
        crs = QgsCoordinateReferenceSystem()
        wkt = (
            'GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",'
            'SPHEROID["WGS_1984",6378137.0,298.257223563]],'
            'PRIMEM["Greenwich",0.0],UNIT["Degree",'
            '0.0174532925199433]]')
        crs.createFromWkt(wkt)
        auth_id = crs.authid()
        expected_auth_id = 'EPSG:4326'
        self.assertEqual(auth_id, expected_auth_id)

        # now test for a loaded layer
        path = os.path.join(os.path.dirname(__file__), 'tenbytenraster.asc')
        title = 'TestRaster'
        layer = QgsRasterLayer(path, title)
        auth_id = layer.crs().authid()
        self.assertEqual(auth_id, expected_auth_id)

if __name__ == '__main__':
    unittest.main()