def test_get_bytes_no_file(self) -> None:
e = DataFileElement("/not/a/valid/path.txt", readonly=True)
# We currently expect, in the case where the filepath doesn't exist, to
# get the same bytes as if the file existed and were empty.
self.assertEqual(e.get_bytes(), b"")
# read-only status should have no effect.
e = DataFileElement("/not/a/valid/path.txt", readonly=True)
self.assertEqual(e.get_bytes(), b"")
def test_load_dataset_tempfile(self) -> None:
"""
Test DataElement temporary file based context loader.
"""
# Creating separate element from global so we can mock it up.
e = DataFileElement(self.gh_image_fp, readonly=True)
e.write_temp = mock.MagicMock(wraps=e.write_temp) # type: ignore
e.clean_temp = mock.MagicMock(wraps=e.clean_temp) # type: ignore
e.get_bytes = mock.MagicMock(wraps=e.get_bytes) # type: ignore
# Using explicit patcher start/stop in order to avoid using ``patch``
# as a decorator because ``osgeo`` might not be defined when
# decorating the method.
patcher_gdal_open = mock.patch(
'smqtk_image_io.impls.image_reader.gdal_io.gdal.Open',
wraps=osgeo.gdal.Open)
self.addCleanup(patcher_gdal_open.stop)
m_gdal_open = patcher_gdal_open.start()
with load_dataset_tempfile(e) as gdal_ds:
# noinspection PyUnresolvedReferences
e.write_temp.assert_called_once_with()
# noinspection PyUnresolvedReferences
e.get_bytes.assert_not_called()
m_gdal_open.assert_called_once()
assert gdal_ds.RasterCount == 3
assert gdal_ds.RasterXSize == 512
assert gdal_ds.RasterYSize == 600
# noinspection PyUnresolvedReferences
e.clean_temp.assert_called_once_with()
assert len(e._temp_filepath_stack) == 0
def test_load_dataset_vsimem(self):
"""
Test that VSIMEM loading context
"""
if LooseVersion(osgeo.__version__).version[0] < 2:
pytest.skip("Skipping VSIMEM test because GDAL version < 2")
# Creating separate element from global so we can mock it up.
e = DataFileElement(GH_IMAGE_FP, readonly=True)
e.write_temp = mock.MagicMock(wraps=e.write_temp)
e.clean_temp = mock.MagicMock(wraps=e.clean_temp)
e.get_bytes = mock.MagicMock(wraps=e.get_bytes)
vsimem_path_re = re.compile(r'^/vsimem/\w+$')
# Using explicit patcher start/stop in order to avoid using ``patch``
# as a *decorator* because ``osgeo`` might not be defined when
# decorating the method.
patcher_gdal_open = mock.patch(
'smqtk_image_io.impls.image_reader.gdal_io.gdal.Open',
wraps=osgeo.gdal.Open,
)
self.addCleanup(patcher_gdal_open.stop)
patcher_gdal_unlink = mock.patch(
'smqtk_image_io.impls.image_reader.gdal_io.gdal.Unlink',
wraps=osgeo.gdal.Unlink,
)
self.addCleanup(patcher_gdal_unlink.stop)
m_gdal_open = patcher_gdal_open.start()
m_gdal_unlink = patcher_gdal_unlink.start()
with load_dataset_vsimem(e) as gdal_ds:
# noinspection PyUnresolvedReferences
e.write_temp.assert_not_called()
# noinspection PyUnresolvedReferences
e.get_bytes.assert_called_once_with()
m_gdal_open.assert_called_once()
ds_path = gdal_ds.GetDescription()
assert vsimem_path_re.match(ds_path)
assert gdal_ds.RasterCount == 3
assert gdal_ds.RasterXSize == 512
assert gdal_ds.RasterYSize == 600
m_gdal_unlink.assert_called_once_with(ds_path)
# noinspection PyUnresolvedReferences
e.clean_temp.assert_not_called()
assert len(e._temp_filepath_stack) == 0
def test_get_bytes(self) -> None:
# Test with a known real file.
test_file_path = os.path.join(TEST_DATA_DIR, 'text_file')
e = DataFileElement(test_file_path)
self.assertEqual(e.get_bytes(), b"Some text content.\n")