#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# Copyright (c) 2009, Giampaolo Rodola'. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Miscellaneous tests."""

import ast
import collections
import errno
import json
import os
import pickle
import socket
import stat
import sys
import unittest

import psutil
import psutil.tests
from psutil import POSIX
from psutil import WINDOWS
from psutil._common import bcat
from psutil._common import cat
from psutil._common import debug
from psutil._common import isfile_strict
from psutil._common import memoize
from psutil._common import memoize_when_activated
from psutil._common import parse_environ_block
from psutil._common import supports_ipv6
from psutil._common import wrap_numbers
from psutil._compat import PY3
from psutil._compat import FileNotFoundError
from psutil._compat import redirect_stderr
from psutil.tests import CI_TESTING
from psutil.tests import HAS_BATTERY
from psutil.tests import HAS_MEMORY_MAPS
from psutil.tests import HAS_NET_IO_COUNTERS
from psutil.tests import HAS_SENSORS_BATTERY
from psutil.tests import HAS_SENSORS_FANS
from psutil.tests import HAS_SENSORS_TEMPERATURES
from psutil.tests import PYTHON_EXE
from psutil.tests import PYTHON_EXE_ENV
from psutil.tests import QEMU_USER
from psutil.tests import SCRIPTS_DIR
from psutil.tests import PsutilTestCase
from psutil.tests import mock
from psutil.tests import process_namespace
from psutil.tests import reload_module
from psutil.tests import sh
from psutil.tests import system_namespace


# ===================================================================
# --- Test classes' repr(), str(), ...
# ===================================================================


class TestSpecialMethods(PsutilTestCase):
    def test_check_pid_range(self):
        with self.assertRaises(OverflowError):
            psutil._psplatform.cext.check_pid_range(2**128)
        with self.assertRaises(psutil.NoSuchProcess):
            psutil.Process(2**128)

    def test_process__repr__(self, func=repr):
        p = psutil.Process(self.spawn_testproc().pid)
        r = func(p)
        self.assertIn("psutil.Process", r)
        self.assertIn("pid=%s" % p.pid, r)
        self.assertIn(
            "name='%s'" % str(p.name()), r.replace("name=u'", "name='")
        )
        self.assertIn("status=", r)
        self.assertNotIn("exitcode=", r)
        p.terminate()
        p.wait()
        r = func(p)
        self.assertIn("status='terminated'", r)
        self.assertIn("exitcode=", r)

        with mock.patch.object(
            psutil.Process,
            "name",
            side_effect=psutil.ZombieProcess(os.getpid()),
        ):
            p = psutil.Process()
            r = func(p)
            self.assertIn("pid=%s" % p.pid, r)
            self.assertIn("status='zombie'", r)
            self.assertNotIn("name=", r)
        with mock.patch.object(
            psutil.Process,
            "name",
            side_effect=psutil.NoSuchProcess(os.getpid()),
        ):
            p = psutil.Process()
            r = func(p)
            self.assertIn("pid=%s" % p.pid, r)
            self.assertIn("terminated", r)
            self.assertNotIn("name=", r)
        with mock.patch.object(
            psutil.Process,
            "name",
            side_effect=psutil.AccessDenied(os.getpid()),
        ):
            p = psutil.Process()
            r = func(p)
            self.assertIn("pid=%s" % p.pid, r)
            self.assertNotIn("name=", r)

    def test_process__str__(self):
        self.test_process__repr__(func=str)

    def test_error__repr__(self):
        self.assertEqual(repr(psutil.Error()), "psutil.Error()")

    def test_error__str__(self):
        self.assertEqual(str(psutil.Error()), "")

    def test_no_such_process__repr__(self):
        self.assertEqual(
            repr(psutil.NoSuchProcess(321)),
            "psutil.NoSuchProcess(pid=321, msg='process no longer exists')",
        )
        self.assertEqual(
            repr(psutil.NoSuchProcess(321, name="name", msg="msg")),
            "psutil.NoSuchProcess(pid=321, name='name', msg='msg')",
        )

    def test_no_such_process__str__(self):
        self.assertEqual(
            str(psutil.NoSuchProcess(321)),
            "process no longer exists (pid=321)",
        )
        self.assertEqual(
            str(psutil.NoSuchProcess(321, name="name", msg="msg")),
            "msg (pid=321, name='name')",
        )

    def test_zombie_process__repr__(self):
        self.assertEqual(
            repr(psutil.ZombieProcess(321)),
            'psutil.ZombieProcess(pid=321, msg="PID still '
            'exists but it\'s a zombie")',
        )
        self.assertEqual(
            repr(psutil.ZombieProcess(321, name="name", ppid=320, msg="foo")),
            "psutil.ZombieProcess(pid=321, ppid=320, name='name', msg='foo')",
        )

    def test_zombie_process__str__(self):
        self.assertEqual(
            str(psutil.ZombieProcess(321)),
            "PID still exists but it's a zombie (pid=321)",
        )
        self.assertEqual(
            str(psutil.ZombieProcess(321, name="name", ppid=320, msg="foo")),
            "foo (pid=321, ppid=320, name='name')",
        )

    def test_access_denied__repr__(self):
        self.assertEqual(
            repr(psutil.AccessDenied(321)), "psutil.AccessDenied(pid=321)"
        )
        self.assertEqual(
            repr(psutil.AccessDenied(321, name="name", msg="msg")),
            "psutil.AccessDenied(pid=321, name='name', msg='msg')",
        )

    def test_access_denied__str__(self):
        self.assertEqual(str(psutil.AccessDenied(321)), "(pid=321)")
        self.assertEqual(
            str(psutil.AccessDenied(321, name="name", msg="msg")),
            "msg (pid=321, name='name')",
        )

    def test_timeout_expired__repr__(self):
        self.assertEqual(
            repr(psutil.TimeoutExpired(5)),
            "psutil.TimeoutExpired(seconds=5, msg='timeout after 5 seconds')",
        )
        self.assertEqual(
            repr(psutil.TimeoutExpired(5, pid=321, name="name")),
            "psutil.TimeoutExpired(pid=321, name='name', seconds=5, "
            "msg='timeout after 5 seconds')",
        )

    def test_timeout_expired__str__(self):
        self.assertEqual(
            str(psutil.TimeoutExpired(5)), "timeout after 5 seconds"
        )
        self.assertEqual(
            str(psutil.TimeoutExpired(5, pid=321, name="name")),
            "timeout after 5 seconds (pid=321, name='name')",
        )

    def test_process__eq__(self):
        p1 = psutil.Process()
        p2 = psutil.Process()
        self.assertEqual(p1, p2)
        p2._ident = (0, 0)
        self.assertNotEqual(p1, p2)
        self.assertNotEqual(p1, 'foo')

    def test_process__hash__(self):
        s = set([psutil.Process(), psutil.Process()])
        self.assertEqual(len(s), 1)


# ===================================================================
# --- Misc, generic, corner cases
# ===================================================================


class TestMisc(PsutilTestCase):
    def test__all__(self):
        dir_psutil = dir(psutil)
        for name in dir_psutil:
            if name in (
                'debug',
                'long',
                'tests',
                'test',
                'PermissionError',
                'ProcessLookupError',
            ):
                continue
            if not name.startswith('_'):
                try:
                    __import__(name)
                except ImportError:
                    if name not in psutil.__all__:
                        fun = getattr(psutil, name)
                        if fun is None:
                            continue
                        if (
                            fun.__doc__ is not None
                            and 'deprecated' not in fun.__doc__.lower()
                        ):
                            raise self.fail('%r not in psutil.__all__' % name)

        # Import 'star' will break if __all__ is inconsistent, see:
        # https://github.com/giampaolo/psutil/issues/656
        # Can't do `from psutil import *` as it won't work on python 3
        # so we simply iterate over __all__.
        for name in psutil.__all__:
            self.assertIn(name, dir_psutil)

    def test_version(self):
        self.assertEqual(
            '.'.join([str(x) for x in psutil.version_info]), psutil.__version__
        )

    def test_process_as_dict_no_new_names(self):
        # See https://github.com/giampaolo/psutil/issues/813
        p = psutil.Process()
        p.foo = '1'
        self.assertNotIn('foo', p.as_dict())

    def test_serialization(self):
        def check(ret):
            json.loads(json.dumps(ret))

            a = pickle.dumps(ret)
            b = pickle.loads(a)
            self.assertEqual(ret, b)

        # --- process APIs

        proc = psutil.Process()
        check(psutil.Process().as_dict())

        ns = process_namespace(proc)
        for fun, name in ns.iter(ns.getters, clear_cache=True):
            with self.subTest(proc=proc, name=name):
                try:
                    ret = fun()
                except psutil.Error:
                    pass
                else:
                    check(ret)

        # --- system APIs

        ns = system_namespace()
        for fun, name in ns.iter(ns.getters):
            if name in {"win_service_iter", "win_service_get"}:
                continue
            if QEMU_USER and name == "net_if_stats":
                # OSError: [Errno 38] ioctl(SIOCETHTOOL) not implemented
                continue
            with self.subTest(name=name):
                try:
                    ret = fun()
                except psutil.AccessDenied:
                    pass
                else:
                    check(ret)

        # --- exception classes

        b = pickle.loads(
            pickle.dumps(
                psutil.NoSuchProcess(pid=4567, name='name', msg='msg')
            )
        )
        self.assertIsInstance(b, psutil.NoSuchProcess)
        self.assertEqual(b.pid, 4567)
        self.assertEqual(b.name, 'name')
        self.assertEqual(b.msg, 'msg')

        b = pickle.loads(
            pickle.dumps(
                psutil.ZombieProcess(pid=4567, name='name', ppid=42, msg='msg')
            )
        )
        self.assertIsInstance(b, psutil.ZombieProcess)
        self.assertEqual(b.pid, 4567)
        self.assertEqual(b.ppid, 42)
        self.assertEqual(b.name, 'name')
        self.assertEqual(b.msg, 'msg')

        b = pickle.loads(
            pickle.dumps(psutil.AccessDenied(pid=123, name='name', msg='msg'))
        )
        self.assertIsInstance(b, psutil.AccessDenied)
        self.assertEqual(b.pid, 123)
        self.assertEqual(b.name, 'name')
        self.assertEqual(b.msg, 'msg')

        b = pickle.loads(
            pickle.dumps(
                psutil.TimeoutExpired(seconds=33, pid=4567, name='name')
            )
        )
        self.assertIsInstance(b, psutil.TimeoutExpired)
        self.assertEqual(b.seconds, 33)
        self.assertEqual(b.pid, 4567)
        self.assertEqual(b.name, 'name')

    # # XXX: https://github.com/pypa/setuptools/pull/2896
    # @unittest.skipIf(APPVEYOR, "temporarily disabled due to setuptools bug")
    # def test_setup_script(self):
    #     setup_py = os.path.join(ROOT_DIR, 'setup.py')
    #     if CI_TESTING and not os.path.exists(setup_py):
    #         raise unittest.SkipTest("can't find setup.py")
    #     module = import_module_by_path(setup_py)
    #     self.assertRaises(SystemExit, module.setup)
    #     self.assertEqual(module.get_version(), psutil.__version__)

    def test_ad_on_process_creation(self):
        # We are supposed to be able to instantiate Process also in case
        # of zombie processes or access denied.
        with mock.patch.object(
            psutil.Process, 'create_time', side_effect=psutil.AccessDenied
        ) as meth:
            psutil.Process()
            assert meth.called
        with mock.patch.object(
            psutil.Process, 'create_time', side_effect=psutil.ZombieProcess(1)
        ) as meth:
            psutil.Process()
            assert meth.called
        with mock.patch.object(
            psutil.Process, 'create_time', side_effect=ValueError
        ) as meth:
            with self.assertRaises(ValueError):
                psutil.Process()
            assert meth.called

    def test_sanity_version_check(self):
        # see: https://github.com/giampaolo/psutil/issues/564
        with mock.patch(
            "psutil._psplatform.cext.version", return_value="0.0.0"
        ):
            with self.assertRaises(ImportError) as cm:
                reload_module(psutil)
            self.assertIn("version conflict", str(cm.exception).lower())


# ===================================================================
# --- psutil/_common.py utils
# ===================================================================


class TestMemoizeDecorator(PsutilTestCase):
    def setUp(self):
        self.calls = []

    tearDown = setUp

    def run_against(self, obj, expected_retval=None):
        # no args
        for _ in range(2):
            ret = obj()
            self.assertEqual(self.calls, [((), {})])
            if expected_retval is not None:
                self.assertEqual(ret, expected_retval)
        # with args
        for _ in range(2):
            ret = obj(1)
            self.assertEqual(self.calls, [((), {}), ((1,), {})])
            if expected_retval is not None:
                self.assertEqual(ret, expected_retval)
        # with args + kwargs
        for _ in range(2):
            ret = obj(1, bar=2)
            self.assertEqual(
                self.calls, [((), {}), ((1,), {}), ((1,), {'bar': 2})]
            )
            if expected_retval is not None:
                self.assertEqual(ret, expected_retval)
        # clear cache
        self.assertEqual(len(self.calls), 3)
        obj.cache_clear()
        ret = obj()
        if expected_retval is not None:
            self.assertEqual(ret, expected_retval)
        self.assertEqual(len(self.calls), 4)
        # docstring
        self.assertEqual(obj.__doc__, "My docstring.")

    def test_function(self):
        @memoize
        def foo(*args, **kwargs):
            """My docstring."""
            baseclass.calls.append((args, kwargs))
            return 22

        baseclass = self
        self.run_against(foo, expected_retval=22)

    def test_class(self):
        @memoize
        class Foo:
            """My docstring."""

            def __init__(self, *args, **kwargs):
                baseclass.calls.append((args, kwargs))

            def bar(self):
                return 22

        baseclass = self
        self.run_against(Foo, expected_retval=None)
        self.assertEqual(Foo().bar(), 22)

    def test_class_singleton(self):
        # @memoize can be used against classes to create singletons
        @memoize
        class Bar:
            def __init__(self, *args, **kwargs):
                pass

        self.assertIs(Bar(), Bar())
        self.assertEqual(id(Bar()), id(Bar()))
        self.assertEqual(id(Bar(1)), id(Bar(1)))
        self.assertEqual(id(Bar(1, foo=3)), id(Bar(1, foo=3)))
        self.assertNotEqual(id(Bar(1)), id(Bar(2)))

    def test_staticmethod(self):
        class Foo:
            @staticmethod
            @memoize
            def bar(*args, **kwargs):
                """My docstring."""
                baseclass.calls.append((args, kwargs))
                return 22

        baseclass = self
        self.run_against(Foo().bar, expected_retval=22)

    def test_classmethod(self):
        class Foo:
            @classmethod
            @memoize
            def bar(cls, *args, **kwargs):
                """My docstring."""
                baseclass.calls.append((args, kwargs))
                return 22

        baseclass = self
        self.run_against(Foo().bar, expected_retval=22)

    def test_original(self):
        # This was the original test before I made it dynamic to test it
        # against different types. Keeping it anyway.
        @memoize
        def foo(*args, **kwargs):
            """Foo docstring."""
            calls.append(None)
            return (args, kwargs)

        calls = []
        # no args
        for _ in range(2):
            ret = foo()
            expected = ((), {})
            self.assertEqual(ret, expected)
            self.assertEqual(len(calls), 1)
        # with args
        for _ in range(2):
            ret = foo(1)
            expected = ((1,), {})
            self.assertEqual(ret, expected)
            self.assertEqual(len(calls), 2)
        # with args + kwargs
        for _ in range(2):
            ret = foo(1, bar=2)
            expected = ((1,), {'bar': 2})
            self.assertEqual(ret, expected)
            self.assertEqual(len(calls), 3)
        # clear cache
        foo.cache_clear()
        ret = foo()
        expected = ((), {})
        self.assertEqual(ret, expected)
        self.assertEqual(len(calls), 4)
        # docstring
        self.assertEqual(foo.__doc__, "Foo docstring.")


class TestCommonModule(PsutilTestCase):
    def test_memoize_when_activated(self):
        class Foo:
            @memoize_when_activated
            def foo(self):
                calls.append(None)

        f = Foo()
        calls = []
        f.foo()
        f.foo()
        self.assertEqual(len(calls), 2)

        # activate
        calls = []
        f.foo.cache_activate(f)
        f.foo()
        f.foo()
        self.assertEqual(len(calls), 1)

        # deactivate
        calls = []
        f.foo.cache_deactivate(f)
        f.foo()
        f.foo()
        self.assertEqual(len(calls), 2)

    def test_parse_environ_block(self):
        def k(s):
            return s.upper() if WINDOWS else s

        self.assertEqual(parse_environ_block("a=1\0"), {k("a"): "1"})
        self.assertEqual(
            parse_environ_block("a=1\0b=2\0\0"), {k("a"): "1", k("b"): "2"}
        )
        self.assertEqual(
            parse_environ_block("a=1\0b=\0\0"), {k("a"): "1", k("b"): ""}
        )
        # ignore everything after \0\0
        self.assertEqual(
            parse_environ_block("a=1\0b=2\0\0c=3\0"),
            {k("a"): "1", k("b"): "2"},
        )
        # ignore everything that is not an assignment
        self.assertEqual(parse_environ_block("xxx\0a=1\0"), {k("a"): "1"})
        self.assertEqual(parse_environ_block("a=1\0=b=2\0"), {k("a"): "1"})
        # do not fail if the block is incomplete
        self.assertEqual(parse_environ_block("a=1\0b=2"), {k("a"): "1"})

    def test_supports_ipv6(self):
        self.addCleanup(supports_ipv6.cache_clear)
        if supports_ipv6():
            with mock.patch('psutil._common.socket') as s:
                s.has_ipv6 = False
                supports_ipv6.cache_clear()
                assert not supports_ipv6()

            supports_ipv6.cache_clear()
            with mock.patch(
                'psutil._common.socket.socket', side_effect=socket.error
            ) as s:
                assert not supports_ipv6()
                assert s.called

            supports_ipv6.cache_clear()
            with mock.patch(
                'psutil._common.socket.socket', side_effect=socket.gaierror
            ) as s:
                assert not supports_ipv6()
                supports_ipv6.cache_clear()
                assert s.called

            supports_ipv6.cache_clear()
            with mock.patch(
                'psutil._common.socket.socket.bind',
                side_effect=socket.gaierror,
            ) as s:
                assert not supports_ipv6()
                supports_ipv6.cache_clear()
                assert s.called
        else:
            with self.assertRaises(socket.error):
                sock = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
                try:
                    sock.bind(("::1", 0))
                finally:
                    sock.close()

    def test_isfile_strict(self):
        this_file = os.path.abspath(__file__)
        assert isfile_strict(this_file)
        assert not isfile_strict(os.path.dirname(this_file))
        with mock.patch(
            'psutil._common.os.stat', side_effect=OSError(errno.EPERM, "foo")
        ):
            self.assertRaises(OSError, isfile_strict, this_file)
        with mock.patch(
            'psutil._common.os.stat', side_effect=OSError(errno.EACCES, "foo")
        ):
            self.assertRaises(OSError, isfile_strict, this_file)
        with mock.patch(
            'psutil._common.os.stat', side_effect=OSError(errno.ENOENT, "foo")
        ):
            assert not isfile_strict(this_file)
        with mock.patch('psutil._common.stat.S_ISREG', return_value=False):
            assert not isfile_strict(this_file)

    def test_debug(self):
        if PY3:
            from io import StringIO
        else:
            from StringIO import StringIO

        with redirect_stderr(StringIO()) as f:
            debug("hello")
            sys.stderr.flush()
        msg = f.getvalue()
        assert msg.startswith("psutil-debug"), msg
        self.assertIn("hello", msg)
        self.assertIn(__file__.replace('.pyc', '.py'), msg)

        # supposed to use repr(exc)
        with redirect_stderr(StringIO()) as f:
            debug(ValueError("this is an error"))
        msg = f.getvalue()
        self.assertIn("ignoring ValueError", msg)
        self.assertIn("'this is an error'", msg)

        # supposed to use str(exc), because of extra info about file name
        with redirect_stderr(StringIO()) as f:
            exc = OSError(2, "no such file")
            exc.filename = "/foo"
            debug(exc)
        msg = f.getvalue()
        self.assertIn("no such file", msg)
        self.assertIn("/foo", msg)

    def test_cat_bcat(self):
        testfn = self.get_testfn()
        with open(testfn, "w") as f:
            f.write("foo")
        self.assertEqual(cat(testfn), "foo")
        self.assertEqual(bcat(testfn), b"foo")
        self.assertRaises(FileNotFoundError, cat, testfn + '-invalid')
        self.assertRaises(FileNotFoundError, bcat, testfn + '-invalid')
        self.assertEqual(cat(testfn + '-invalid', fallback="bar"), "bar")
        self.assertEqual(bcat(testfn + '-invalid', fallback="bar"), "bar")


# ===================================================================
# --- Tests for wrap_numbers() function.
# ===================================================================


nt = collections.namedtuple('foo', 'a b c')


class TestWrapNumbers(PsutilTestCase):
    def setUp(self):
        wrap_numbers.cache_clear()

    tearDown = setUp

    def test_first_call(self):
        input = {'disk1': nt(5, 5, 5)}
        self.assertEqual(wrap_numbers(input, 'disk_io'), input)

    def test_input_hasnt_changed(self):
        input = {'disk1': nt(5, 5, 5)}
        self.assertEqual(wrap_numbers(input, 'disk_io'), input)
        self.assertEqual(wrap_numbers(input, 'disk_io'), input)

    def test_increase_but_no_wrap(self):
        input = {'disk1': nt(5, 5, 5)}
        self.assertEqual(wrap_numbers(input, 'disk_io'), input)
        input = {'disk1': nt(10, 15, 20)}
        self.assertEqual(wrap_numbers(input, 'disk_io'), input)
        input = {'disk1': nt(20, 25, 30)}
        self.assertEqual(wrap_numbers(input, 'disk_io'), input)
        input = {'disk1': nt(20, 25, 30)}
        self.assertEqual(wrap_numbers(input, 'disk_io'), input)

    def test_wrap(self):
        # let's say 100 is the threshold
        input = {'disk1': nt(100, 100, 100)}
        self.assertEqual(wrap_numbers(input, 'disk_io'), input)
        # first wrap restarts from 10
        input = {'disk1': nt(100, 100, 10)}
        self.assertEqual(
            wrap_numbers(input, 'disk_io'), {'disk1': nt(100, 100, 110)}
        )
        # then it remains the same
        input = {'disk1': nt(100, 100, 10)}
        self.assertEqual(
            wrap_numbers(input, 'disk_io'), {'disk1': nt(100, 100, 110)}
        )
        # then it goes up
        input = {'disk1': nt(100, 100, 90)}
        self.assertEqual(
            wrap_numbers(input, 'disk_io'), {'disk1': nt(100, 100, 190)}
        )
        # then it wraps again
        input = {'disk1': nt(100, 100, 20)}
        self.assertEqual(
            wrap_numbers(input, 'disk_io'), {'disk1': nt(100, 100, 210)}
        )
        # and remains the same
        input = {'disk1': nt(100, 100, 20)}
        self.assertEqual(
            wrap_numbers(input, 'disk_io'), {'disk1': nt(100, 100, 210)}
        )
        # now wrap another num
        input = {'disk1': nt(50, 100, 20)}
        self.assertEqual(
            wrap_numbers(input, 'disk_io'), {'disk1': nt(150, 100, 210)}
        )
        # and again
        input = {'disk1': nt(40, 100, 20)}
        self.assertEqual(
            wrap_numbers(input, 'disk_io'), {'disk1': nt(190, 100, 210)}
        )
        # keep it the same
        input = {'disk1': nt(40, 100, 20)}
        self.assertEqual(
            wrap_numbers(input, 'disk_io'), {'disk1': nt(190, 100, 210)}
        )

    def test_changing_keys(self):
        # Emulate a case where the second call to disk_io()
        # (or whatever) provides a new disk, then the new disk
        # disappears on the third call.
        input = {'disk1': nt(5, 5, 5)}
        self.assertEqual(wrap_numbers(input, 'disk_io'), input)
        input = {'disk1': nt(5, 5, 5), 'disk2': nt(7, 7, 7)}
        self.assertEqual(wrap_numbers(input, 'disk_io'), input)
        input = {'disk1': nt(8, 8, 8)}
        self.assertEqual(wrap_numbers(input, 'disk_io'), input)

    def test_changing_keys_w_wrap(self):
        input = {'disk1': nt(50, 50, 50), 'disk2': nt(100, 100, 100)}
        self.assertEqual(wrap_numbers(input, 'disk_io'), input)
        # disk 2 wraps
        input = {'disk1': nt(50, 50, 50), 'disk2': nt(100, 100, 10)}
        self.assertEqual(
            wrap_numbers(input, 'disk_io'),
            {'disk1': nt(50, 50, 50), 'disk2': nt(100, 100, 110)},
        )
        # disk 2 disappears
        input = {'disk1': nt(50, 50, 50)}
        self.assertEqual(wrap_numbers(input, 'disk_io'), input)

        # then it appears again; the old wrap is supposed to be
        # gone.
        input = {'disk1': nt(50, 50, 50), 'disk2': nt(100, 100, 100)}
        self.assertEqual(wrap_numbers(input, 'disk_io'), input)
        # remains the same
        input = {'disk1': nt(50, 50, 50), 'disk2': nt(100, 100, 100)}
        self.assertEqual(wrap_numbers(input, 'disk_io'), input)
        # and then wraps again
        input = {'disk1': nt(50, 50, 50), 'disk2': nt(100, 100, 10)}
        self.assertEqual(
            wrap_numbers(input, 'disk_io'),
            {'disk1': nt(50, 50, 50), 'disk2': nt(100, 100, 110)},
        )

    def test_real_data(self):
        d = {
            'nvme0n1': (300, 508, 640, 1571, 5970, 1987, 2049, 451751, 47048),
            'nvme0n1p1': (1171, 2, 5600256, 1024, 516, 0, 0, 0, 8),
            'nvme0n1p2': (54, 54, 2396160, 5165056, 4, 24, 30, 1207, 28),
            'nvme0n1p3': (2389, 4539, 5154, 150, 4828, 1844, 2019, 398, 348),
        }
        self.assertEqual(wrap_numbers(d, 'disk_io'), d)
        self.assertEqual(wrap_numbers(d, 'disk_io'), d)
        # decrease this   ↓
        d = {
            'nvme0n1': (100, 508, 640, 1571, 5970, 1987, 2049, 451751, 47048),
            'nvme0n1p1': (1171, 2, 5600256, 1024, 516, 0, 0, 0, 8),
            'nvme0n1p2': (54, 54, 2396160, 5165056, 4, 24, 30, 1207, 28),
            'nvme0n1p3': (2389, 4539, 5154, 150, 4828, 1844, 2019, 398, 348),
        }
        out = wrap_numbers(d, 'disk_io')
        self.assertEqual(out['nvme0n1'][0], 400)

    # --- cache tests

    def test_cache_first_call(self):
        input = {'disk1': nt(5, 5, 5)}
        wrap_numbers(input, 'disk_io')
        cache = wrap_numbers.cache_info()
        self.assertEqual(cache[0], {'disk_io': input})
        self.assertEqual(cache[1], {'disk_io': {}})
        self.assertEqual(cache[2], {'disk_io': {}})

    def test_cache_call_twice(self):
        input = {'disk1': nt(5, 5, 5)}
        wrap_numbers(input, 'disk_io')
        input = {'disk1': nt(10, 10, 10)}
        wrap_numbers(input, 'disk_io')
        cache = wrap_numbers.cache_info()
        self.assertEqual(cache[0], {'disk_io': input})
        self.assertEqual(
            cache[1],
            {'disk_io': {('disk1', 0): 0, ('disk1', 1): 0, ('disk1', 2): 0}},
        )
        self.assertEqual(cache[2], {'disk_io': {}})

    def test_cache_wrap(self):
        # let's say 100 is the threshold
        input = {'disk1': nt(100, 100, 100)}
        wrap_numbers(input, 'disk_io')

        # first wrap restarts from 10
        input = {'disk1': nt(100, 100, 10)}
        wrap_numbers(input, 'disk_io')
        cache = wrap_numbers.cache_info()
        self.assertEqual(cache[0], {'disk_io': input})
        self.assertEqual(
            cache[1],
            {'disk_io': {('disk1', 0): 0, ('disk1', 1): 0, ('disk1', 2): 100}},
        )
        self.assertEqual(cache[2], {'disk_io': {'disk1': set([('disk1', 2)])}})

        def check_cache_info():
            cache = wrap_numbers.cache_info()
            self.assertEqual(
                cache[1],
                {
                    'disk_io': {
                        ('disk1', 0): 0,
                        ('disk1', 1): 0,
                        ('disk1', 2): 100,
                    }
                },
            )
            self.assertEqual(
                cache[2], {'disk_io': {'disk1': set([('disk1', 2)])}}
            )

        # then it remains the same
        input = {'disk1': nt(100, 100, 10)}
        wrap_numbers(input, 'disk_io')
        cache = wrap_numbers.cache_info()
        self.assertEqual(cache[0], {'disk_io': input})
        check_cache_info()

        # then it goes up
        input = {'disk1': nt(100, 100, 90)}
        wrap_numbers(input, 'disk_io')
        cache = wrap_numbers.cache_info()
        self.assertEqual(cache[0], {'disk_io': input})
        check_cache_info()

        # then it wraps again
        input = {'disk1': nt(100, 100, 20)}
        wrap_numbers(input, 'disk_io')
        cache = wrap_numbers.cache_info()
        self.assertEqual(cache[0], {'disk_io': input})
        self.assertEqual(
            cache[1],
            {'disk_io': {('disk1', 0): 0, ('disk1', 1): 0, ('disk1', 2): 190}},
        )
        self.assertEqual(cache[2], {'disk_io': {'disk1': set([('disk1', 2)])}})

    def test_cache_changing_keys(self):
        input = {'disk1': nt(5, 5, 5)}
        wrap_numbers(input, 'disk_io')
        input = {'disk1': nt(5, 5, 5), 'disk2': nt(7, 7, 7)}
        wrap_numbers(input, 'disk_io')
        cache = wrap_numbers.cache_info()
        self.assertEqual(cache[0], {'disk_io': input})
        self.assertEqual(
            cache[1],
            {'disk_io': {('disk1', 0): 0, ('disk1', 1): 0, ('disk1', 2): 0}},
        )
        self.assertEqual(cache[2], {'disk_io': {}})

    def test_cache_clear(self):
        input = {'disk1': nt(5, 5, 5)}
        wrap_numbers(input, 'disk_io')
        wrap_numbers(input, 'disk_io')
        wrap_numbers.cache_clear('disk_io')
        self.assertEqual(wrap_numbers.cache_info(), ({}, {}, {}))
        wrap_numbers.cache_clear('disk_io')
        wrap_numbers.cache_clear('?!?')

    @unittest.skipIf(not HAS_NET_IO_COUNTERS, 'not supported')
    def test_cache_clear_public_apis(self):
        if not psutil.disk_io_counters() or not psutil.net_io_counters():
            raise unittest.SkipTest("no disks or NICs available")
        psutil.disk_io_counters()
        psutil.net_io_counters()
        caches = wrap_numbers.cache_info()
        for cache in caches:
            self.assertIn('psutil.disk_io_counters', cache)
            self.assertIn('psutil.net_io_counters', cache)

        psutil.disk_io_counters.cache_clear()
        caches = wrap_numbers.cache_info()
        for cache in caches:
            self.assertIn('psutil.net_io_counters', cache)
            self.assertNotIn('psutil.disk_io_counters', cache)

        psutil.net_io_counters.cache_clear()
        caches = wrap_numbers.cache_info()
        self.assertEqual(caches, ({}, {}, {}))


# ===================================================================
# --- Example script tests
# ===================================================================


@unittest.skipIf(
    not os.path.exists(SCRIPTS_DIR), "can't locate scripts directory"
)
class TestScripts(PsutilTestCase):
    """Tests for scripts in the "scripts" directory."""

    @staticmethod
    def assert_stdout(exe, *args, **kwargs):
        kwargs.setdefault("env", PYTHON_EXE_ENV)
        exe = '%s' % os.path.join(SCRIPTS_DIR, exe)
        cmd = [PYTHON_EXE, exe]
        for arg in args:
            cmd.append(arg)
        try:
            out = sh(cmd, **kwargs).strip()
        except RuntimeError as err:
            if 'AccessDenied' in str(err):
                return str(err)
            else:
                raise
        assert out, out
        return out

    @staticmethod
    def assert_syntax(exe):
        exe = os.path.join(SCRIPTS_DIR, exe)
        with open(exe, encoding="utf8") if PY3 else open(exe) as f:
            src = f.read()
        ast.parse(src)

    def test_coverage(self):
        # make sure all example scripts have a test method defined
        meths = dir(self)
        for name in os.listdir(SCRIPTS_DIR):
            if name.endswith('.py'):
                if 'test_' + os.path.splitext(name)[0] not in meths:
                    # self.assert_stdout(name)
                    raise self.fail(
                        'no test defined for %r script'
                        % os.path.join(SCRIPTS_DIR, name)
                    )

    @unittest.skipIf(not POSIX, "POSIX only")
    def test_executable(self):
        for root, dirs, files in os.walk(SCRIPTS_DIR):
            for file in files:
                if file.endswith('.py'):
                    path = os.path.join(root, file)
                    if not stat.S_IXUSR & os.stat(path)[stat.ST_MODE]:
                        raise self.fail('%r is not executable' % path)

    def test_disk_usage(self):
        self.assert_stdout('disk_usage.py')

    def test_free(self):
        self.assert_stdout('free.py')

    def test_meminfo(self):
        self.assert_stdout('meminfo.py')

    def test_procinfo(self):
        self.assert_stdout('procinfo.py', str(os.getpid()))

    @unittest.skipIf(CI_TESTING and not psutil.users(), "no users")
    def test_who(self):
        self.assert_stdout('who.py')

    def test_ps(self):
        self.assert_stdout('ps.py')

    def test_pstree(self):
        self.assert_stdout('pstree.py')

    def test_netstat(self):
        self.assert_stdout('netstat.py')

    @unittest.skipIf(QEMU_USER, 'QEMU user not supported')
    def test_ifconfig(self):
        self.assert_stdout('ifconfig.py')

    @unittest.skipIf(not HAS_MEMORY_MAPS, "not supported")
    def test_pmap(self):
        self.assert_stdout('pmap.py', str(os.getpid()))

    def test_procsmem(self):
        if 'uss' not in psutil.Process().memory_full_info()._fields:
            raise unittest.SkipTest("not supported")
        self.assert_stdout('procsmem.py')

    def test_killall(self):
        self.assert_syntax('killall.py')

    def test_nettop(self):
        self.assert_syntax('nettop.py')

    def test_top(self):
        self.assert_syntax('top.py')

    def test_iotop(self):
        self.assert_syntax('iotop.py')

    def test_pidof(self):
        output = self.assert_stdout('pidof.py', psutil.Process().name())
        self.assertIn(str(os.getpid()), output)

    @unittest.skipIf(not WINDOWS, "WINDOWS only")
    def test_winservices(self):
        self.assert_stdout('winservices.py')

    def test_cpu_distribution(self):
        self.assert_syntax('cpu_distribution.py')

    @unittest.skipIf(not HAS_SENSORS_TEMPERATURES, "not supported")
    def test_temperatures(self):
        if not psutil.sensors_temperatures():
            raise unittest.SkipTest("no temperatures")
        self.assert_stdout('temperatures.py')

    @unittest.skipIf(not HAS_SENSORS_FANS, "not supported")
    def test_fans(self):
        if not psutil.sensors_fans():
            raise unittest.SkipTest("no fans")
        self.assert_stdout('fans.py')

    @unittest.skipIf(not HAS_SENSORS_BATTERY, "not supported")
    @unittest.skipIf(not HAS_BATTERY, "no battery")
    def test_battery(self):
        self.assert_stdout('battery.py')

    @unittest.skipIf(not HAS_SENSORS_BATTERY, "not supported")
    @unittest.skipIf(not HAS_BATTERY, "no battery")
    def test_sensors(self):
        self.assert_stdout('sensors.py')


if __name__ == '__main__':
    from psutil.tests.runner import run_from_name

    run_from_name(__file__)
