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import os
import pytest
import platform

from numpy.f2py.crackfortran import (
    _selected_int_kind_func as selected_int_kind,
    _selected_real_kind_func as selected_real_kind,
)
from . import util


class TestKind(util.F2PyTest):
    sources = [util.getpath("tests", "src", "kind", "foo.f90")]

    def test_int(self):
        """Test `int` kind_func for integers up to 10**40."""
        selectedintkind = self.module.selectedintkind

        for i in range(40):
            assert selectedintkind(i) == selected_int_kind(
                i
            ), f"selectedintkind({i}): expected {selected_int_kind(i)!r} but got {selectedintkind(i)!r}"

    def test_real(self):
        """
        Test (processor-dependent) `real` kind_func for real numbers
        of up to 31 digits precision (extended/quadruple).
        """
        selectedrealkind = self.module.selectedrealkind

        for i in range(32):
            assert selectedrealkind(i) == selected_real_kind(
                i
            ), f"selectedrealkind({i}): expected {selected_real_kind(i)!r} but got {selectedrealkind(i)!r}"

    @pytest.mark.xfail(platform.machine().lower().startswith("ppc"),
                       reason="Some PowerPC may not support full IEEE 754 precision")
    def test_quad_precision(self):
        """
        Test kind_func for quadruple precision [`real(16)`] of 32+ digits .
        """
        selectedrealkind = self.module.selectedrealkind

        for i in range(32, 40):
            assert selectedrealkind(i) == selected_real_kind(
                i
            ), f"selectedrealkind({i}): expected {selected_real_kind(i)!r} but got {selectedrealkind(i)!r}"