def test_encode():
dtype = 'i8'
astype = 'i4'
codec = Delta(dtype=dtype, astype=astype)
arr = np.arange(10, 20, 1, dtype=dtype)
expect = np.array([10] + ([1] * 9), dtype=astype)
actual = codec.encode(arr)
assert_array_equal(expect, actual)
eq(np.dtype(astype), actual.dtype)
def test_backwards_compatibility():
for arr in arrays:
codec = Delta(dtype=arr.dtype)
check_backwards_compatibility(Delta.codec_id, [arr], [codec], prefix=str(arr.dtype))
def test_config():
codec = Delta(dtype='<i4', astype='<i2')
check_config(codec)
def test_encode_decode():
for arr in arrays:
codec = Delta(dtype=arr.dtype)
check_encode_decode(arr, codec)
def test_errors():
with pytest.raises(ValueError):
Delta(dtype=object)
with pytest.raises(ValueError):
Delta(dtype='i8', astype=object)