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"""Test deprecation and future warnings.

"""
import pytest
import numpy as np
from numpy.testing import assert_warns
from numpy.ma.testutils import assert_equal
from numpy.ma.core import MaskedArrayFutureWarning
import io
import textwrap

class TestArgsort:
    """ gh-8701 """
    def _test_base(self, argsort, cls):
        arr_0d = np.array(1).view(cls)
        argsort(arr_0d)

arr_1d = np.array([1, 2, 3]).view(cls)
        argsort(arr_1d)

# argsort has a bad default for >1d arrays
        arr_2d = np.array([[1, 2], [3, 4]]).view(cls)
        result = assert_warns(
            np.ma.core.MaskedArrayFutureWarning, argsort, arr_2d)
        assert_equal(result, argsort(arr_2d, axis=None))

# should be no warnings for explicitly specifying it
        argsort(arr_2d, axis=None)
        argsort(arr_2d, axis=-1)

def test_function_ndarray(self):
        return self._test_base(np.ma.argsort, np.ndarray)

def test_function_maskedarray(self):
        return self._test_base(np.ma.argsort, np.ma.MaskedArray)

def test_method(self):
        return self._test_base(np.ma.MaskedArray.argsort, np.ma.MaskedArray)

class TestMinimumMaximum:

def test_axis_default(self):
        # NumPy 1.13, 2017-05-06

data1d = np.ma.arange(6)
        data2d = data1d.reshape(2, 3)

ma_min = np.ma.minimum.reduce
        ma_max = np.ma.maximum.reduce

# check that the default axis is still None, but warns on 2d arrays
        result = assert_warns(MaskedArrayFutureWarning, ma_max, data2d)
        assert_equal(result, ma_max(data2d, axis=None))

result = assert_warns(MaskedArrayFutureWarning, ma_min, data2d)
        assert_equal(result, ma_min(data2d, axis=None))

# no warnings on 1d, as both new and old defaults are equivalent
        result = ma_min(data1d)
        assert_equal(result, ma_min(data1d, axis=None))
        assert_equal(result, ma_min(data1d, axis=0))

result = ma_max(data1d)
        assert_equal(result, ma_max(data1d, axis=None))
        assert_equal(result, ma_max(data1d, axis=0))

class TestFromtextfile:
    def test_fromtextfile_delimitor(self):
        # NumPy 1.22.0, 2021-09-23

textfile = io.StringIO(textwrap.dedent(
            """
            A,B,C,D
            'string 1';1;1.0;'mixed column'
            'string 2';2;2.0;
            'string 3';3;3.0;123
            'string 4';4;4.0;3.14
            """
        ))

with pytest.warns(DeprecationWarning):
            result = np.ma.mrecords.fromtextfile(textfile, delimitor=';')

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📝 test_deprecations.py

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