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test_file_loader.py
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test_file_loader.py
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import logging
import unittest
import mock
import xarray
import tests.helpers
from tests.RME import RMETestCase
from weather_forecast_retrieval.data.hrrr.file_loader import FileLoader
from weather_forecast_retrieval.data.hrrr.grib_file import GribFile
from weather_forecast_retrieval.data.hrrr.netcdf_file import NetCdfFile
class TestFileLoader(unittest.TestCase):
FILE_DIR = 'path/to/files/'
def setUp(self):
self.subject = FileLoader(
self.FILE_DIR, config=tests.helpers.LOG_ERROR_CONFIG
)
def test_file_dir_property(self):
self.assertEqual(self.subject.file_dir, self.FILE_DIR)
def test_defaults_to_grib2(self):
self.assertIsInstance(self.subject.file_loader, GribFile)
self.assertEqual(GribFile.SUFFIX, self.subject.file_type)
def test_change_file_dir(self):
NEW_DIR = 'somewhere/else'
self.subject.file_dir = NEW_DIR
self.assertEqual(NEW_DIR, self.subject.file_dir)
def test_change_file_type(self):
self.subject.file_type = NetCdfFile.SUFFIX
self.assertEqual(NetCdfFile.SUFFIX, self.subject.file_type)
def test_logger_to_file_loader(self):
self.assertEqual(
self.subject.log,
self.subject.file_loader.log
)
def saved_data_return_values():
metadata = mock.MagicMock()
metadata.name = 'metadata'
dataframe = mock.MagicMock(spec={})
dataframe.name = 'dataframe'
return metadata, dataframe
@mock.patch.object(FileLoader, 'get_data')
@mock.patch.object(
FileLoader,
'convert_to_dataframes',
return_value=saved_data_return_values()
)
class TestFileLoaderGetSavedData(RMETestCase):
METHOD_ARGS = [
RMETestCase.START_DATE, RMETestCase.END_DATE, RMETestCase.BBOX
]
@classmethod
def setUpClass(cls):
cls.subject = FileLoader(
file_dir='path', config=tests.helpers.LOG_ERROR_CONFIG
)
def test_parameters(self, _data_patch, _df_patch):
self.subject.get_saved_data(*self.METHOD_ARGS)
self.assertEqual(self.START_DATE, self.subject.start_date)
self.assertEqual(self.END_DATE, self.subject.end_date)
self.assertEqual(self.BBOX, self.subject.file_loader.bbox)
def test_call_get_data(self, data_patch, _df_patch):
self.subject.get_saved_data(*self.METHOD_ARGS)
data_patch.assert_called_once_with(GribFile.VAR_MAP)
def test_call_get_data_for_specific_keys(self, data_patch, _df_patch):
var_key = 'air_temp'
self.subject.get_saved_data(*self.METHOD_ARGS, var_keys=[var_key])
data_patch.assert_called_once_with(
{var_key: GribFile.VAR_MAP[var_key]}
)
def test_converts_df(self, _data_patch, df_patch):
self.subject.get_saved_data(*self.METHOD_ARGS)
df_patch.assert_called_once_with(GribFile.VAR_MAP)
def test_returns_metadata_and_df(self, _data_patch, _df_patch):
metadata, dataframe = self.subject.get_saved_data(*self.METHOD_ARGS)
self.assertEqual('metadata', metadata.name)
self.assertEqual('dataframe', dataframe.name)
class TestFileLoaderGetData(RMETestCase):
def setUp(self):
super().setUp()
file_loader = mock.MagicMock(spec=GribFile)
file_loader.name = 'MockLoader'
file_loader.SUFFIX = GribFile.SUFFIX
subject = FileLoader(
file_dir=RMETestCase.hrrr_dir.as_posix(),
config=tests.helpers.LOG_ERROR_CONFIG
)
subject.start_date = RMETestCase.START_DATE
subject.end_date = RMETestCase.END_DATE
self.subject = subject
self.subject.log.setLevel(logging.ERROR)
self.subject._file_loader = file_loader
def test_call_to_load(self):
self.subject.get_data({})
self.assertEqual(
6,
self.subject.file_loader.load.call_count,
msg='More data was loaded than requested forecast hours'
)
self.assertRegex(
self.subject.file_loader.load.call_args.args[0],
r'.*/hrrr.20180722/hrrr.t05z.wrfsfcf01.grib2',
msg='Path to file not passed to file loader'
)
self.assertEqual(
{},
self.subject.file_loader.load.call_args.args[1],
msg='Var map not passed to file loader'
)
def test_tries_six_forecast_hours(self):
self.subject.file_loader.load.side_effect = Exception('Data error')
with mock.patch('os.path.exists', return_value=True):
self.subject.end_date = \
self.subject.end_date - 5 * FileLoader.NEXT_HOUR
with self.assertRaisesRegex(IOError, 'Not able to find good file'):
self.subject.get_data({})
self.assertEqual(
6,
self.subject.file_loader.load.call_count,
msg='Tried to load than six forecast hours for a '
'single time step'
)
def test_file_not_found(self):
self.subject.file_dir = None
with self.assertRaises(IOError):
self.subject.get_data({})
self.assertEqual(
0,
self.subject.file_loader.load.call_count,
msg='Tried to load data from file although not present on disk'
)
def test_with_loading_error(self):
self.subject.file_loader.load.side_effect = Exception('Data error')
with self.assertRaises(IOError):
self.subject.get_data({})
# Can't load the file on disk and the other forecast hours are missing
self.assertEqual(
1,
self.subject.file_loader.load.call_count,
msg='Tried to find more files than present on disk'
)
def test_sets_data_attribute(self):
self.subject.get_data({})
self.assertIsInstance(self.subject.data, xarray.Dataset)
def test_failed_combine_coords(self):
with mock.patch('xarray.combine_by_coords') as xr_patch:
xr_patch.side_effect = Exception('Combine failed')
self.subject.end_date = \
self.subject.end_date - 5 * FileLoader.NEXT_HOUR
self.subject.get_data({})
self.assertEqual(
None,
self.subject.data,
msg='Data set although failed to combine'
)