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[EDIT] FILE: test_string.py

import os
import pytest
import textwrap
import numpy as np
from . import util

class TestString(util.F2PyTest):
    sources = [util.getpath("tests", "src", "string", "char.f90")]

@pytest.mark.slow
    def test_char(self):
        strings = np.array(["ab", "cd", "ef"], dtype="c").T
        inp, out = self.module.char_test.change_strings(
            strings, strings.shape[1])
        assert inp == pytest.approx(strings)
        expected = strings.copy()
        expected[1, :] = "AAA"
        assert out == pytest.approx(expected)

class TestDocStringArguments(util.F2PyTest):
    sources = [util.getpath("tests", "src", "string", "string.f")]

def test_example(self):
        a = np.array(b"123\0\0")
        b = np.array(b"123\0\0")
        c = np.array(b"123")
        d = np.array(b"123")

self.module.foo(a, b, c, d)

assert a.tobytes() == b"123\0\0"
        assert b.tobytes() == b"B23\0\0"
        assert c.tobytes() == b"123"
        assert d.tobytes() == b"D23"

class TestFixedString(util.F2PyTest):
    sources = [util.getpath("tests", "src", "string", "fixed_string.f90")]

@staticmethod
    def _sint(s, start=0, end=None):
        """Return the content of a string buffer as integer value.

For example:
          _sint('1234') -> 4321
          _sint('123A') -> 17321
        """
        if isinstance(s, np.ndarray):
            s = s.tobytes()
        elif isinstance(s, str):
            s = s.encode()
        assert isinstance(s, bytes)
        if end is None:
            end = len(s)
        i = 0
        for j in range(start, min(end, len(s))):
            i += s[j] * 10**j
        return i

def _get_input(self, intent="in"):
        if intent in ["in"]:
            yield ""
            yield "1"
            yield "1234"
            yield "12345"
            yield b""
            yield b"\0"
            yield b"1"
            yield b"\01"
            yield b"1\0"
            yield b"1234"
            yield b"12345"
        yield np.ndarray((), np.bytes_, buffer=b"")  # array(b'', dtype='|S0')
        yield np.array(b"")  # array(b'', dtype='|S1')
        yield np.array(b"\0")
        yield np.array(b"1")
        yield np.array(b"1\0")
        yield np.array(b"\01")
        yield np.array(b"1234")
        yield np.array(b"123\0")
        yield np.array(b"12345")

def test_intent_in(self):
        for s in self._get_input():
            r = self.module.test_in_bytes4(s)
            # also checks that s is not changed inplace
            expected = self._sint(s, end=4)
            assert r == expected, s

def test_intent_inout(self):
        for s in self._get_input(intent="inout"):
            rest = self._sint(s, start=4)
            r = self.module.test_inout_bytes4(s)
            expected = self._sint(s, end=4)
            assert r == expected

# check that the rest of input string is preserved
            assert rest == self._sint(s, start=4)

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