def test_create(self):
# Check we can create a new file from scratch, with the correct
# cross-referencing automatically applied to the headers to
# enable it to load again.
with self.temp_filename() as temp_path:
ffv = FieldsFileVariant(temp_path, FieldsFileVariant.CREATE_MODE)
ffv.fixed_length_header = FixedLengthHeader([-1] * 256)
ffv.fixed_length_header.data_set_format_version = 20
ffv.fixed_length_header.sub_model = 1
ffv.fixed_length_header.dataset_type = 3
constants = IMDI * np.ones(46, dtype=int)
constants[5] = 4
constants[6] = 5
ffv.integer_constants = constants
ints = IMDI * np.ones(45, dtype=int)
ints[17] = 4 # LBROW
ints[18] = 5 # LBNPT
ints[20] = 0 # LBPACK
ints[21] = 2 # LBREL
ints[38] = 1 # LBUSER(1)
reals = list(range(19))
src_data = np.arange(20, dtype='f4').reshape((4, 5))
ffv.fields = [Field2(ints, reals, src_data)]
ffv.close()
ffv = FieldsFileVariant(temp_path)
# Fill with -1 instead of IMDI so we can detect where IMDI
# values are being automatically set.
expected = -np.ones(256, dtype=int)
expected[0] = 20
expected[1] = 1
expected[4] = 3
expected[99:101] = (257, 46) # Integer constants
expected[104:106] = IMDI
expected[109:112] = IMDI
expected[114:117] = IMDI
expected[119:122] = IMDI
expected[124:127] = IMDI
expected[129:131] = IMDI
expected[134:136] = IMDI
expected[139:145] = IMDI
expected[149:152] = (303, 64, 1) # 303 = 256 + 46 + 1
expected[159:161] = (2049, 2048)
# Compare using lists because we get more helpful error messages!
self.assertEqual(list(ffv.fixed_length_header.raw), list(expected))
self.assertArrayEqual(ffv.integer_constants, constants)
self.assertIsNone(ffv.real_constants)
self.assertEqual(len(ffv.fields), 1)
for field in ffv.fields:
data = field.get_data()
self.assertArrayEqual(data, src_data)
def test_fixed_length_header_wrong_dtype(self):
# Check that using the wrong dtype in the fixed length header
# doesn't confuse things.
src_path = tests.get_data_path(('FF', 'n48_multi_field'))
with self.temp_filename() as temp_path:
shutil.copyfile(src_path, temp_path)
ffv = FieldsFileVariant(temp_path, FieldsFileVariant.UPDATE_MODE)
header_values = ffv.fixed_length_header.raw
self.assertEqual(header_values.dtype, '>i8')
header = FixedLengthHeader(header_values.astype('<i4'))
ffv.fixed_length_header = header
ffv.close()
ffv = FieldsFileVariant(temp_path)
# If the header was written out with the wrong dtype this
# value will go crazy - so check that it's still OK.
self.assertEqual(ffv.fixed_length_header.sub_model, 1)
def test_equal(self):
ffv1 = FixedLengthHeader(list(range(256)))
ffv2 = FixedLengthHeader(np.arange(256))
self.assertFalse(ffv1.__ne__(ffv2))
def test_invalid(self):
ffv1 = FixedLengthHeader(list(range(256)))
self.assertIs(ffv1.__eq__(np.arange(256)), NotImplemented)
def test_invalid_length(self):
with self.assertRaisesRegexp(ValueError, 'Incorrect number of words'):
FixedLengthHeader(list(range(15)))
def make_header():
return FixedLengthHeader((np.arange(256) + 1) * 10)