django/tests/gis_tests/tests.py

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import sys
import unittest
from django.core.exceptions import ImproperlyConfigured
from django.db import ProgrammingError
from django.utils import six
try:
from django.contrib.gis.db.backends.postgis.operations import PostGISOperations
HAS_POSTGRES = True
except ImportError:
HAS_POSTGRES = False
except ImproperlyConfigured as e:
# If psycopg is installed but not geos, the import path hits
# django.contrib.gis.geometry.backend which will "helpfully" convert
# an ImportError into an ImproperlyConfigured.
# Here, we make sure we're only catching this specific case and not another
# ImproperlyConfigured one.
if e.args and e.args[0].startswith('Could not import user-defined GEOMETRY_BACKEND'):
HAS_POSTGRES = False
else:
six.reraise(*sys.exc_info())
if HAS_POSTGRES:
class FakeConnection:
def __init__(self):
self.settings_dict = {
'NAME': 'test',
}
class FakePostGISOperations(PostGISOperations):
def __init__(self, version=None):
self.version = version
self.connection = FakeConnection()
def _get_postgis_func(self, func):
if func == 'postgis_lib_version':
if self.version is None:
raise ProgrammingError
else:
return self.version
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elif func == 'version':
pass
else:
raise NotImplementedError('This function was not expected to be called')
@unittest.skipUnless(HAS_POSTGRES, "The psycopg2 driver is needed for these tests")
class TestPostGISVersionCheck(unittest.TestCase):
"""
The PostGIS version check parses correctly the version numbers
"""
def test_get_version(self):
expect = '1.0.0'
ops = FakePostGISOperations(expect)
actual = ops.postgis_lib_version()
self.assertEqual(expect, actual)
def test_version_classic_tuple(self):
expect = ('1.2.3', 1, 2, 3)
ops = FakePostGISOperations(expect[0])
actual = ops.postgis_version_tuple()
self.assertEqual(expect, actual)
def test_version_dev_tuple(self):
expect = ('1.2.3dev', 1, 2, 3)
ops = FakePostGISOperations(expect[0])
actual = ops.postgis_version_tuple()
self.assertEqual(expect, actual)
def test_valid_version_numbers(self):
versions = [
('1.3.0', 1, 3, 0),
('2.1.1', 2, 1, 1),
('2.2.0dev', 2, 2, 0),
]
for version in versions:
ops = FakePostGISOperations(version[0])
actual = ops.spatial_version
self.assertEqual(version[1:], actual)
def test_invalid_version_numbers(self):
versions = ['nope', '123']
for version in versions:
ops = FakePostGISOperations(version)
with self.assertRaises(Exception):
ops.spatial_version
def test_no_version_number(self):
ops = FakePostGISOperations()
with self.assertRaises(ImproperlyConfigured):
ops.spatial_version
def test_version_dependent_funcs(self):
"""
Resolve names of functions renamed and deprecated in PostGIS 2.2.0
depending on PostGIS version.
Remove when dropping support for PostGIS 2.1.
"""
ops = FakePostGISOperations('2.2.0')
self.assertEqual(ops.spatial_function_name('DistanceSphere'), 'ST_DistanceSphere')
self.assertEqual(ops.spatial_function_name('DistanceSpheroid'), 'ST_DistanceSpheroid')
self.assertEqual(ops.spatial_function_name('LengthSpheroid'), 'ST_LengthSpheroid')
self.assertEqual(ops.spatial_function_name('MemSize'), 'ST_MemSize')
ops = FakePostGISOperations('2.1.0')
self.assertEqual(ops.spatial_function_name('DistanceSphere'), 'ST_distance_sphere')
self.assertEqual(ops.spatial_function_name('DistanceSpheroid'), 'ST_distance_spheroid')
self.assertEqual(ops.spatial_function_name('LengthSpheroid'), 'ST_length_spheroid')
self.assertEqual(ops.spatial_function_name('MemSize'), 'ST_mem_size')