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test_arraymethod.py
""" This file tests the generic aspects of ArrayMethod. At the time of writing this is private API, but when added, public API may be added here. """ from __future__ import annotations import sys import types from typing import Any import pytest import numpy as np from numpy.core._multiarray_umath import _get_castingimpl as get_castingimpl class TestResolveDescriptors: # Test mainly error paths of the resolve_descriptors function, # note that the `casting_unittests` tests exercise this non-error paths. # Casting implementations are the main/only current user: method = get_castingimpl(type(np.dtype("d")), type(np.dtype("f"))) @pytest.mark.parametrize("args", [ (True,), # Not a tuple. ((None,)), # Too few elements ((None, None, None),), # Too many ((None, None),), # Input dtype is None, which is invalid. ((np.dtype("d"), True),), # Output dtype is not a dtype ((np.dtype("f"), None),), # Input dtype does not match method ]) def test_invalid_arguments(self, args): with pytest.raises(TypeError): self.method._resolve_descriptors(*args) class TestSimpleStridedCall: # Test mainly error paths of the resolve_descriptors function, # note that the `casting_unittests` tests exercise this non-error paths. # Casting implementations are the main/only current user: method = get_castingimpl(type(np.dtype("d")), type(np.dtype("f"))) @pytest.mark.parametrize(["args", "error"], [ ((True,), TypeError), # Not a tuple (((None,),), TypeError), # Too few elements ((None, None), TypeError), # Inputs are not arrays. (((None, None, None),), TypeError), # Too many (((np.arange(3), np.arange(3)),), TypeError), # Incorrect dtypes (((np.ones(3, dtype=">d"), np.ones(3, dtype="<f")),), TypeError), # Does not support byte-swapping (((np.ones((2, 2), dtype="d"), np.ones((2, 2), dtype="f")),), ValueError), # not 1-D (((np.ones(3, dtype="d"), np.ones(4, dtype="f")),), ValueError), # different length (((np.frombuffer(b"\0x00"*3*2, dtype="d"), np.frombuffer(b"\0x00"*3, dtype="f")),), ValueError), # output not writeable ]) def test_invalid_arguments(self, args, error): # This is private API, which may be modified freely with pytest.raises(error): self.method._simple_strided_call(*args) @pytest.mark.parametrize( "cls", [np.ndarray, np.recarray, np.chararray, np.matrix, np.memmap] ) class TestClassGetItem: def test_class_getitem(self, cls: type[np.ndarray]) -> None: """Test `ndarray.__class_getitem__`.""" alias = cls[Any, Any] assert isinstance(alias, types.GenericAlias) assert alias.__origin__ is cls @pytest.mark.parametrize("arg_len", range(4)) def test_subscript_tup(self, cls: type[np.ndarray], arg_len: int) -> None: arg_tup = (Any,) * arg_len if arg_len in (1, 2): assert cls[arg_tup] else: match = f"Too {'few' if arg_len == 0 else 'many'} arguments" with pytest.raises(TypeError, match=match): cls[arg_tup]
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