tqdm/tests/tests_tqdm.py

# -*- coding: utf-8 -*-
# Advice: use repr(our_file.read()) to print the full output of tqdm
# (else '\r' will replace the previous lines and you'll see only the latest.
import csv
import os
import re
import sys
from contextlib import contextmanager
from functools import wraps
from warnings import catch_warnings, simplefilter

from pytest import importorskip, mark, raises, skip

from tqdm import TqdmDeprecationWarning, TqdmWarning, tqdm, trange
from tqdm.contrib import DummyTqdmFile
from tqdm.std import EMA, Bar

try:
    from StringIO import StringIO
except ImportError:
    from io import StringIO

from io import IOBase  # to support unicode strings
from io import BytesIO


class DeprecationError(Exception):
    pass


# Ensure we can use `with closing(...) as ... :` syntax
if getattr(StringIO, '__exit__', False) and getattr(StringIO, '__enter__', False):
    def closing(arg):
        return arg
else:
    from contextlib import closing

nt_and_no_colorama = False
if os.name == 'nt':
    try:
        import colorama  # NOQA
    except ImportError:
        nt_and_no_colorama = True

# Regex definitions
# List of control characters
CTRLCHR = [r'\r', r'\n', r'\x1b\[A']  # Need to escape [ for regex
# Regular expressions compilation
RE_rate = re.compile(r'[^\d](\d[.\d]+)it/s')
RE_ctrlchr = re.compile("(%s)" % '|'.join(CTRLCHR))  # Match control chars
RE_ctrlchr_excl = re.compile('|'.join(CTRLCHR))  # Match and exclude ctrl chars
RE_pos = re.compile(r'([\r\n]+((pos\d+) bar:\s+\d+%|\s{3,6})?[^\r\n]*)')


def pos_line_diff(res_list, expected_list, raise_nonempty=True):
    """
    Return differences between two bar output lists.
    To be used with `RE_pos`
    """
    res = [(r, e) for r, e in zip(res_list, expected_list)
           for pos in [len(e) - len(e.lstrip('\n'))]  # bar position
           if r != e  # simple comparison
           if not r.startswith(e)  # start matches
           or not (
               # move up at end (maybe less due to closing bars)
               any(r.endswith(end + i * '\x1b[A') for i in range(pos + 1)
                   for end in [
                       ']',  # bar
                       '  '])  # cleared
               or '100%' in r  # completed bar
               or r == '\n')  # final bar
           or r[(-1 - pos) * len('\x1b[A'):] == '\x1b[A']  # too many moves up
    if raise_nonempty and (res or len(res_list) != len(expected_list)):
        if len(res_list) < len(expected_list):
            res.extend([(None, e) for e in expected_list[len(res_list):]])
        elif len(res_list) > len(expected_list):
            res.extend([(r, None) for r in res_list[len(expected_list):]])
        raise AssertionError(
            "Got => Expected\n" + '\n'.join('%r => %r' % i for i in res))
    return res


class DiscreteTimer(object):
    """Virtual discrete time manager, to precisely control time for tests"""
    def __init__(self):
        self.t = 0.0

    def sleep(self, t):
        """Sleep = increment the time counter (almost no CPU used)"""
        self.t += t

    def time(self):
        """Get the current time"""
        return self.t


def cpu_timify(t, timer=None):
    """Force tqdm to use the specified timer instead of system-wide time()"""
    if timer is None:
        timer = DiscreteTimer()
    t._time = timer.time
    t._sleep = timer.sleep
    t.start_t = t.last_print_t = t._time()
    return timer


class UnicodeIO(IOBase):
    """Unicode version of StringIO"""
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.encoding = 'U8'  # io.StringIO supports unicode, but no encoding
        self.text = ''
        self.cursor = 0

    def __len__(self):
        return len(self.text)

    def seek(self, offset):
        self.cursor = offset

    def tell(self):
        return self.cursor

    def write(self, s):
        self.text = self.text[:self.cursor] + s + self.text[self.cursor + len(s):]
        self.cursor += len(s)

    def read(self, n=-1):
        _cur = self.cursor
        self.cursor = len(self) if n < 0 else min(_cur + n, len(self))
        return self.text[_cur:self.cursor]

    def getvalue(self):
        return self.text


def get_bar(all_bars, i=None):
    """Get a specific update from a whole bar traceback"""
    # Split according to any used control characters
    bars_split = RE_ctrlchr_excl.split(all_bars)
    bars_split = list(filter(None, bars_split))  # filter out empty splits
    return bars_split if i is None else bars_split[i]


def progressbar_rate(bar_str):
    return float(RE_rate.search(bar_str).group(1))


def squash_ctrlchars(s):
    """Apply control characters in a string just like a terminal display"""
    curline = 0
    lines = ['']  # state of fake terminal
    for nextctrl in filter(None, RE_ctrlchr.split(s)):
        # apply control chars
        if nextctrl == '\r':
            # go to line beginning (simplified here: just empty the string)
            lines[curline] = ''
        elif nextctrl == '\n':
            if curline >= len(lines) - 1:
                # wrap-around creates newline
                lines.append('')
            # move cursor down
            curline += 1
        elif nextctrl == '\x1b[A':
            # move cursor up
            if curline > 0:
                curline -= 1
            else:
                raise ValueError("Cannot go further up")
        else:
            # print message on current line
            lines[curline] += nextctrl
    return lines


def test_format_interval():
    """Test time interval format"""
    format_interval = tqdm.format_interval

    assert format_interval(60) == '01:00'
    assert format_interval(6160) == '1:42:40'
    assert format_interval(238113) == '66:08:33'


def test_format_num():
    """Test number format"""
    format_num = tqdm.format_num

    assert float(format_num(1337)) == 1337
    assert format_num(int(1e6)) == '1e+6'
    assert format_num(1239876) == '1' '239' '876'
    assert format_num(0.00001234) == '1.23e-5'
    assert format_num(-0.1234) == '-0.123'


def test_format_meter():
    """Test statistics and progress bar formatting"""
    try:
        unich = unichr
    except NameError:
        unich = chr

    format_meter = tqdm.format_meter

    assert format_meter(0, 1000, 13) == "  0%|          | 0/1000 [00:13<?, ?it/s]"
    # If not implementing any changes to _tqdm.py, set prefix='desc'
    # or else ": : " will be in output, so assertion should change
    assert format_meter(0, 1000, 13, ncols=68, prefix='desc: ') == (
        "desc:   0%|                                | 0/1000 [00:13<?, ?it/s]")
    assert format_meter(231, 1000, 392) == (" 23%|" + unich(0x2588) * 2 + unich(0x258e) +
                                            "       | 231/1000 [06:32<21:44,  1.70s/it]")
    assert format_meter(10000, 1000, 13) == "10000it [00:13, 769.23it/s]"
    assert format_meter(231, 1000, 392, ncols=56, ascii=True) == " 23%|" + '#' * 3 + '6' + (
        "            | 231/1000 [06:32<21:44,  1.70s/it]")
    assert format_meter(100000, 1000, 13, unit_scale=True,
                        unit='iB') == "100kiB [00:13, 7.69kiB/s]"
    assert format_meter(100, 1000, 12, ncols=0,
                        rate=7.33) == " 10% 100/1000 [00:12<02:02,  7.33it/s]"
    # ncols is small, l_bar is too large
    # l_bar gets chopped
    # no bar
    # no r_bar
    # 10/12 stars since ncols is 10
    assert format_meter(
        0, 1000, 13, ncols=10,
        bar_format="************{bar:10}$$$$$$$$$$") == "**********"
    # n_cols allows for l_bar and some of bar
    # l_bar displays
    # bar gets chopped
    # no r_bar
    # all 12 stars and 8/10 bar parts
    assert format_meter(
        0, 1000, 13, ncols=20,
        bar_format="************{bar:10}$$$$$$$$$$") == "************        "
    # n_cols allows for l_bar, bar, and some of r_bar
    # l_bar displays
    # bar displays
    # r_bar gets chopped
    # all 12 stars and 10 bar parts, but only 8/10 dollar signs
    assert format_meter(
        0, 1000, 13, ncols=30,
        bar_format="************{bar:10}$$$$$$$$$$") == "************          $$$$$$$$"
    # trim left ANSI; escape is before trim zone
    # we only know it has ANSI codes, so we append an END code anyway
    assert format_meter(
        0, 1000, 13, ncols=10, bar_format="*****\033[22m****\033[0m***{bar:10}$$$$$$$$$$"
    ) == "*****\033[22m****\033[0m*\033[0m"
    # trim left ANSI; escape is at trim zone
    assert format_meter(
        0, 1000, 13, ncols=10,
        bar_format="*****\033[22m*****\033[0m**{bar:10}$$$$$$$$$$") == "*****\033[22m*****\033[0m"
    # trim left ANSI; escape is after trim zone
    assert format_meter(
        0, 1000, 13, ncols=10,
        bar_format="*****\033[22m******\033[0m*{bar:10}$$$$$$$$$$") == "*****\033[22m*****\033[0m"
    # Check that bar_format correctly adapts {bar} size to the rest
    assert format_meter(
        20, 100, 12, ncols=13, rate=8.1,
        bar_format=r'{l_bar}{bar}|{n_fmt}/{total_fmt}') == " 20%|" + unich(0x258f) + "|20/100"
    assert format_meter(
        20, 100, 12, ncols=14, rate=8.1,
        bar_format=r'{l_bar}{bar}|{n_fmt}/{total_fmt}') == " 20%|" + unich(0x258d) + " |20/100"
    # Check wide characters
    assert format_meter(0, 1000, 13, ncols=68, prefix='ｆｕｌｌｗｉｄｔｈ: ') == (
        "ｆｕｌｌｗｉｄｔｈ:   0%|                  | 0/1000 [00:13<?, ?it/s]")
    assert format_meter(0, 1000, 13, ncols=68, prefix='ニッポン [ﾆｯﾎﾟﾝ]: ') == (
        "ニッポン [ﾆｯﾎﾟﾝ]:   0%|                    | 0/1000 [00:13<?, ?it/s]")
    # Check that bar_format can print only {bar} or just one side
    assert format_meter(20, 100, 12, ncols=2, rate=8.1,
                        bar_format=r'{bar}') == unich(0x258d) + " "
    assert format_meter(20, 100, 12, ncols=7, rate=8.1,
                        bar_format=r'{l_bar}{bar}') == " 20%|" + unich(0x258d) + " "
    assert format_meter(20, 100, 12, ncols=6, rate=8.1,
                        bar_format=r'{bar}|test') == unich(0x258f) + "|test"


def test_ansi_escape_codes():
    """Test stripping of ANSI escape codes"""
    ansi = {'BOLD': '\033[1m', 'RED': '\033[91m', 'END': '\033[0m'}
    desc_raw = '{BOLD}{RED}Colored{END} description'
    ncols = 123

    desc_stripped = desc_raw.format(BOLD='', RED='', END='')
    meter = tqdm.format_meter(0, 100, 0, ncols=ncols, prefix=desc_stripped)
    assert len(meter) == ncols

    desc = desc_raw.format(**ansi)
    meter = tqdm.format_meter(0, 100, 0, ncols=ncols, prefix=desc)
    # `format_meter` inserts an extra END for safety
    ansi_len = len(desc) - len(desc_stripped) + len(ansi['END'])
    assert len(meter) == ncols + ansi_len


def test_si_format():
    """Test SI unit prefixes"""
    format_meter = tqdm.format_meter

    assert '9.00 ' in format_meter(1, 9, 1, unit_scale=True, unit='B')
    assert '99.0 ' in format_meter(1, 99, 1, unit_scale=True)
    assert '999 ' in format_meter(1, 999, 1, unit_scale=True)
    assert '9.99k ' in format_meter(1, 9994, 1, unit_scale=True)
    assert '10.0k ' in format_meter(1, 9999, 1, unit_scale=True)
    assert '99.5k ' in format_meter(1, 99499, 1, unit_scale=True)
    assert '100k ' in format_meter(1, 99999, 1, unit_scale=True)
    assert '1.00M ' in format_meter(1, 999999, 1, unit_scale=True)
    assert '1.00G ' in format_meter(1, 999999999, 1, unit_scale=True)
    assert '1.00T ' in format_meter(1, 999999999999, 1, unit_scale=True)
    assert '1.00P ' in format_meter(1, 999999999999999, 1, unit_scale=True)
    assert '1.00E ' in format_meter(1, 999999999999999999, 1, unit_scale=True)
    assert '1.00Z ' in format_meter(1, 999999999999999999999, 1, unit_scale=True)
    assert '1.0Y ' in format_meter(1, 999999999999999999999999, 1, unit_scale=True)
    assert '10.0Y ' in format_meter(1, 9999999999999999999999999, 1, unit_scale=True)
    assert '100.0Y ' in format_meter(1, 99999999999999999999999999, 1, unit_scale=True)
    assert '1000.0Y ' in format_meter(1, 999999999999999999999999999, 1,
                                      unit_scale=True)


def test_bar_formatspec():
    """Test Bar.__format__ spec"""
    assert f"{Bar(0.3):5a}" == "#5   "
    assert f"{Bar(0.5, charset=' .oO0'):2}" == "0 "
    assert f"{Bar(0.5, charset=' .oO0'):2a}" == "# "
    assert f"{Bar(0.5, 10):-6a}" == '##  '
    assert f"{Bar(0.5, 10):2b}" == '  '


def test_all_defaults():
    """Test default kwargs"""
    with closing(UnicodeIO()) as our_file:
        with tqdm(range(10), file=our_file) as progressbar:
            assert len(progressbar) == 10
            for _ in progressbar:
                pass
    # restore stdout/stderr output for `nosetest` interface
    # try:
    #     sys.stderr.write('\x1b[A')
    # except:
    #     pass
    sys.stderr.write('\rTest default kwargs ... ')


class WriteTypeChecker(BytesIO):
    """File-like to assert the expected type is written"""
    def __init__(self, expected_type):
        super().__init__()
        self.expected_type = expected_type

    def write(self, s):
        assert isinstance(s, self.expected_type)


def test_native_string_io_for_default_file():
    """Native strings written to unspecified files"""
    stderr = sys.stderr
    try:
        sys.stderr = WriteTypeChecker(expected_type=type(''))
        for _ in tqdm(range(3)):
            pass
        sys.stderr.encoding = None  # py2 behaviour
        for _ in tqdm(range(3)):
            pass
    finally:
        sys.stderr = stderr


def test_unicode_string_io_for_specified_file():
    """Unicode strings written to specified files"""
    for _ in tqdm(range(3), file=WriteTypeChecker(expected_type=type(u''))):
        pass


def test_write_bytes():
    """Test write_bytes argument with and without `file`"""
    # specified file (and bytes)
    for _ in tqdm(range(3), file=WriteTypeChecker(expected_type=type(b'')),
                  write_bytes=True):
        pass
    # unspecified file (and unicode)
    stderr = sys.stderr
    try:
        sys.stderr = WriteTypeChecker(expected_type=type(u''))
        for _ in tqdm(range(3), write_bytes=False):
            pass
    finally:
        sys.stderr = stderr


def test_iterate_over_csv_rows():
    """Test csv iterator"""
    # Create a test csv pseudo file
    with closing(StringIO()) as test_csv_file:
        writer = csv.writer(test_csv_file)
        for _ in range(3):
            writer.writerow(['test'] * 3)
        test_csv_file.seek(0)

        # Test that nothing fails if we iterate over rows
        reader = csv.DictReader(test_csv_file, fieldnames=('row1', 'row2', 'row3'))
        with closing(StringIO()) as our_file:
            for _ in tqdm(reader, file=our_file):
                pass


def test_file_output():
    """Test output to arbitrary file-like objects"""
    with closing(StringIO()) as our_file:
        for i in tqdm(range(3), file=our_file):
            if i == 1:
                our_file.seek(0)
                assert '0/3' in our_file.read()


def test_leave_option():
    """Test `leave=True` always prints info about the last iteration"""
    with closing(StringIO()) as our_file:
        for _ in tqdm(range(3), file=our_file, leave=True):
            pass
        res = our_file.getvalue()
        assert '| 3/3 ' in res
        assert '\n' == res[-1]  # not '\r'

    with closing(StringIO()) as our_file2:
        for _ in tqdm(range(3), file=our_file2, leave=False):
            pass
        assert '| 3/3 ' not in our_file2.getvalue()


def test_trange():
    """Test trange"""
    with closing(StringIO()) as our_file:
        for _ in trange(3, file=our_file, leave=True):
            pass
        assert '| 3/3 ' in our_file.getvalue()

    with closing(StringIO()) as our_file2:
        for _ in trange(3, file=our_file2, leave=False):
            pass
        assert '| 3/3 ' not in our_file2.getvalue()


def test_min_interval():
    """Test mininterval"""
    with closing(StringIO()) as our_file:
        for _ in tqdm(range(3), file=our_file, mininterval=1e-10):
            pass
        assert "  0%|          | 0/3 [00:00<" in our_file.getvalue()


def test_max_interval():
    """Test maxinterval"""
    total = 100
    bigstep = 10
    smallstep = 5

    # Test without maxinterval
    timer = DiscreteTimer()
    with closing(StringIO()) as our_file:
        with closing(StringIO()) as our_file2:
            # with maxinterval but higher than loop sleep time
            t = tqdm(total=total, file=our_file, miniters=None, mininterval=0,
                     smoothing=1, maxinterval=1e-2)
            cpu_timify(t, timer)

            # without maxinterval
            t2 = tqdm(total=total, file=our_file2, miniters=None, mininterval=0,
                      smoothing=1, maxinterval=None)
            cpu_timify(t2, timer)

            assert t.dynamic_miniters
            assert t2.dynamic_miniters

            # Increase 10 iterations at once
            t.update(bigstep)
            t2.update(bigstep)
            # The next iterations should not trigger maxinterval (step 10)
            for _ in range(4):
                t.update(smallstep)
                t2.update(smallstep)
                timer.sleep(1e-5)
            t.close()  # because PyPy doesn't gc immediately
            t2.close()  # as above

            assert "25%" not in our_file2.getvalue()
        assert "25%" not in our_file.getvalue()

    # Test with maxinterval effect
    timer = DiscreteTimer()
    with closing(StringIO()) as our_file:
        with tqdm(total=total, file=our_file, miniters=None, mininterval=0,
                  smoothing=1, maxinterval=1e-4) as t:
            cpu_timify(t, timer)

            # Increase 10 iterations at once
            t.update(bigstep)
            # The next iterations should trigger maxinterval (step 5)
            for _ in range(4):
                t.update(smallstep)
                timer.sleep(1e-2)

            assert "25%" in our_file.getvalue()

    # Test iteration based tqdm with maxinterval effect
    timer = DiscreteTimer()
    with closing(StringIO()) as our_file:
        with tqdm(range(total), file=our_file, miniters=None,
                  mininterval=1e-5, smoothing=1, maxinterval=1e-4) as t2:
            cpu_timify(t2, timer)

            for i in t2:
                if i >= (bigstep - 1) and ((i - (bigstep - 1)) % smallstep) == 0:
                    timer.sleep(1e-2)
                if i >= 3 * bigstep:
                    break

        assert "15%" in our_file.getvalue()

    # Test different behavior with and without mininterval
    timer = DiscreteTimer()
    total = 1000
    mininterval = 0.1
    maxinterval = 10
    with closing(StringIO()) as our_file:
        with tqdm(total=total, file=our_file, miniters=None, smoothing=1,
                  mininterval=mininterval, maxinterval=maxinterval) as tm1:
            with tqdm(total=total, file=our_file, miniters=None, smoothing=1,
                      mininterval=0, maxinterval=maxinterval) as tm2:

                cpu_timify(tm1, timer)
                cpu_timify(tm2, timer)

                # Fast iterations, check if dynamic_miniters triggers
                timer.sleep(mininterval)  # to force update for t1
                tm1.update(total / 2)
                tm2.update(total / 2)
                assert int(tm1.miniters) == tm2.miniters == total / 2

                # Slow iterations, check different miniters if mininterval
                timer.sleep(maxinterval * 2)
                tm1.update(total / 2)
                tm2.update(total / 2)
                res = [tm1.miniters, tm2.miniters]
                assert res == [(total / 2) * mininterval / (maxinterval * 2),
                               (total / 2) * maxinterval / (maxinterval * 2)]

    # Same with iterable based tqdm
    timer1 = DiscreteTimer()  # need 2 timers for each bar because zip not work
    timer2 = DiscreteTimer()
    total = 100
    mininterval = 0.1
    maxinterval = 10
    with closing(StringIO()) as our_file:
        t1 = tqdm(range(total), file=our_file, miniters=None, smoothing=1,
                  mininterval=mininterval, maxinterval=maxinterval)
        t2 = tqdm(range(total), file=our_file, miniters=None, smoothing=1,
                  mininterval=0, maxinterval=maxinterval)

        cpu_timify(t1, timer1)
        cpu_timify(t2, timer2)

        for i in t1:
            if i == ((total / 2) - 2):
                timer1.sleep(mininterval)
            if i == (total - 1):
                timer1.sleep(maxinterval * 2)

        for i in t2:
            if i == ((total / 2) - 2):
                timer2.sleep(mininterval)
            if i == (total - 1):
                timer2.sleep(maxinterval * 2)

        assert t1.miniters == 0.255
        assert t2.miniters == 0.5

        t1.close()
        t2.close()


def test_delay():
    """Test delay"""
    timer = DiscreteTimer()
    with closing(StringIO()) as our_file:
        t = tqdm(total=2, file=our_file, leave=True, delay=3)
        cpu_timify(t, timer)
        timer.sleep(2)
        t.update(1)
        assert not our_file.getvalue()
        timer.sleep(2)
        t.update(1)
        assert our_file.getvalue()
        t.close()


def test_min_iters():
    """Test miniters"""
    with closing(StringIO()) as our_file:
        for _ in tqdm(range(3), file=our_file, leave=True, mininterval=0, miniters=2):
            pass

        out = our_file.getvalue()
        assert '| 0/3 ' in out
        assert '| 1/3 ' not in out
        assert '| 2/3 ' in out
        assert '| 3/3 ' in out

    with closing(StringIO()) as our_file:
        for _ in tqdm(range(3), file=our_file, leave=True, mininterval=0, miniters=1):
            pass

        out = our_file.getvalue()
        assert '| 0/3 ' in out
        assert '| 1/3 ' in out
        assert '| 2/3 ' in out
        assert '| 3/3 ' in out


def test_dynamic_min_iters():
    """Test purely dynamic miniters (and manual updates and __del__)"""
    with closing(StringIO()) as our_file:
        total = 10
        t = tqdm(total=total, file=our_file, miniters=None, mininterval=0, smoothing=1)

        t.update()
        # Increase 3 iterations
        t.update(3)
        # The next two iterations should be skipped because of dynamic_miniters
        t.update()
        t.update()
        # The third iteration should be displayed
        t.update()

        out = our_file.getvalue()
        assert t.dynamic_miniters
        t.__del__()  # simulate immediate del gc

    assert '  0%|          | 0/10 [00:00<' in out
    assert '40%' in out
    assert '50%' not in out
    assert '60%' not in out
    assert '70%' in out

    # Check with smoothing=0, miniters should be set to max update seen so far
    with closing(StringIO()) as our_file:
        total = 10
        t = tqdm(total=total, file=our_file, miniters=None, mininterval=0, smoothing=0)

        t.update()
        t.update(2)
        t.update(5)  # this should be stored as miniters
        t.update(1)

        out = our_file.getvalue()
        assert all(i in out for i in ("0/10", "1/10", "3/10"))
        assert "2/10" not in out
        assert t.dynamic_miniters and not t.smoothing
        assert t.miniters == 5
        t.close()

    # Check iterable based tqdm
    with closing(StringIO()) as our_file:
        t = tqdm(range(10), file=our_file, miniters=None, mininterval=None,
                 smoothing=0.5)
        for _ in t:
            pass
        assert t.dynamic_miniters

    # No smoothing
    with closing(StringIO()) as our_file:
        t = tqdm(range(10), file=our_file, miniters=None, mininterval=None,
                 smoothing=0)
        for _ in t:
            pass
        assert t.dynamic_miniters

    # No dynamic_miniters (miniters is fixed manually)
    with closing(StringIO()) as our_file:
        t = tqdm(range(10), file=our_file, miniters=1, mininterval=None)
        for _ in t:
            pass
        assert not t.dynamic_miniters


def test_big_min_interval():
    """Test large mininterval"""
    with closing(StringIO()) as our_file:
        for _ in tqdm(range(2), file=our_file, mininterval=1E10):
            pass
        assert '50%' not in our_file.getvalue()

    with closing(StringIO()) as our_file:
        with tqdm(range(2), file=our_file, mininterval=1E10) as t:
            t.update()
            t.update()
            assert '50%' not in our_file.getvalue()


def test_smoothed_dynamic_min_iters():
    """Test smoothed dynamic miniters"""
    timer = DiscreteTimer()

    with closing(StringIO()) as our_file:
        with tqdm(total=100, file=our_file, miniters=None, mininterval=1,
                  smoothing=0.5, maxinterval=0) as t:
            cpu_timify(t, timer)

            # Increase 10 iterations at once
            timer.sleep(1)
            t.update(10)
            # The next iterations should be partially skipped
            for _ in range(2):
                timer.sleep(1)
                t.update(4)
            for _ in range(20):
                timer.sleep(1)
                t.update()

            assert t.dynamic_miniters
        out = our_file.getvalue()
    assert '  0%|          | 0/100 [00:00<' in out
    assert '20%' in out
    assert '23%' not in out
    assert '25%' in out
    assert '26%' not in out
    assert '28%' in out


def test_smoothed_dynamic_min_iters_with_min_interval():
    """Test smoothed dynamic miniters with mininterval"""
    timer = DiscreteTimer()

    # In this test, `miniters` should gradually decline
    total = 100

    with closing(StringIO()) as our_file:
        # Test manual updating tqdm
        with tqdm(total=total, file=our_file, miniters=None, mininterval=1e-3,
                  smoothing=1, maxinterval=0) as t:
            cpu_timify(t, timer)

            t.update(10)
            timer.sleep(1e-2)
            for _ in range(4):
                t.update()
                timer.sleep(1e-2)
            out = our_file.getvalue()
            assert t.dynamic_miniters

    with closing(StringIO()) as our_file:
        # Test iteration-based tqdm
        with tqdm(range(total), file=our_file, miniters=None,
                  mininterval=0.01, smoothing=1, maxinterval=0) as t2:
            cpu_timify(t2, timer)

            for i in t2:
                if i >= 10:
                    timer.sleep(0.1)
                if i >= 14:
                    break
            out2 = our_file.getvalue()

    assert t.dynamic_miniters
    assert '  0%|          | 0/100 [00:00<' in out
    assert '11%' in out and '11%' in out2
    # assert '12%' not in out and '12%' in out2
    assert '13%' in out and '13%' in out2
    assert '14%' in out and '14%' in out2


@mark.slow
def test_rlock_creation():
    """Test that importing tqdm does not create multiprocessing objects."""
    mp = importorskip('multiprocessing')
    if not hasattr(mp, 'get_context'):
        skip("missing multiprocessing.get_context")

    # Use 'spawn' instead of 'fork' so that the process does not inherit any
    # globals that have been constructed by running other tests
    ctx = mp.get_context('spawn')
    with ctx.Pool(1) as pool:
        # The pool will propagate the error if the target method fails
        pool.apply(_rlock_creation_target)


def _rlock_creation_target():
    """Check that the RLock has not been constructed."""
    import multiprocessing as mp
    patch = importorskip('unittest.mock').patch

    # Patch the RLock class/method but use the original implementation
    with patch('multiprocessing.RLock', wraps=mp.RLock) as rlock_mock:
        # Importing the module should not create a lock
        from tqdm import tqdm
        assert rlock_mock.call_count == 0
        # Creating a progress bar should initialize the lock
        with closing(StringIO()) as our_file:
            with tqdm(file=our_file) as _:  # NOQA
                pass
        assert rlock_mock.call_count == 1
        # Creating a progress bar again should reuse the lock
        with closing(StringIO()) as our_file:
            with tqdm(file=our_file) as _:  # NOQA
                pass
        assert rlock_mock.call_count == 1


def test_disable():
    """Test disable"""
    with closing(StringIO()) as our_file:
        for _ in tqdm(range(3), file=our_file, disable=True):
            pass
        assert our_file.getvalue() == ''

    with closing(StringIO()) as our_file:
        progressbar = tqdm(total=3, file=our_file, miniters=1, disable=True)
        progressbar.update(3)
        progressbar.close()
        assert our_file.getvalue() == ''


def test_infinite_total():
    """Test treatment of infinite total"""
    with closing(StringIO()) as our_file:
        for _ in tqdm(range(3), file=our_file, total=float("inf")):
            pass


def test_nototal():
    """Test unknown total length"""
    with closing(StringIO()) as our_file:
        for _ in tqdm(iter(range(10)), file=our_file, unit_scale=10):
            pass
        assert "100it" in our_file.getvalue()

    with closing(StringIO()) as our_file:
        for _ in tqdm(iter(range(10)), file=our_file,
                      bar_format="{l_bar}{bar}{r_bar}"):
            pass
        assert "10/?" in our_file.getvalue()


def test_unit():
    """Test SI unit prefix"""
    with closing(StringIO()) as our_file:
        for _ in tqdm(range(3), file=our_file, miniters=1, unit="bytes"):
            pass
        assert 'bytes/s' in our_file.getvalue()


def test_ascii():
    """Test ascii/unicode bar"""
    # Test ascii autodetection
    with closing(StringIO()) as our_file:
        with tqdm(total=10, file=our_file, ascii=None) as t:
            assert t.ascii  # TODO: this may fail in the future

    # Test ascii bar
    with closing(StringIO()) as our_file:
        for _ in tqdm(range(3), total=15, file=our_file, miniters=1,
                      mininterval=0, ascii=True):
            pass
        res = our_file.getvalue().strip("\r").split("\r")
    assert '7%|6' in res[1]
    assert '13%|#3' in res[2]
    assert '20%|##' in res[3]

    # Test unicode bar
    with closing(UnicodeIO()) as our_file:
        with tqdm(total=15, file=our_file, ascii=False, mininterval=0) as t:
            for _ in range(3):
                t.update()
        res = our_file.getvalue().strip("\r").split("\r")
    assert u"7%|\u258b" in res[1]
    assert u"13%|\u2588\u258e" in res[2]
    assert u"20%|\u2588\u2588" in res[3]

    # Test custom bar
    for bars in [" .oO0", " #"]:
        with closing(StringIO()) as our_file:
            for _ in tqdm(range(len(bars) - 1), file=our_file, miniters=1,
                          mininterval=0, ascii=bars, ncols=27):
                pass
            res = our_file.getvalue().strip("\r").split("\r")
        for b, line in zip(bars, res):
            assert '|' + b + '|' in line


def test_update():
    """Test manual creation and updates"""
    res = None
    with closing(StringIO()) as our_file:
        with tqdm(total=2, file=our_file, miniters=1, mininterval=0) as progressbar:
            assert len(progressbar) == 2
            progressbar.update(2)
            assert '| 2/2' in our_file.getvalue()
            progressbar.desc = 'dynamically notify of 4 increments in total'
            progressbar.total = 4
            progressbar.update(-1)
            progressbar.update(2)
        res = our_file.getvalue()
    assert '| 3/4 ' in res
    assert 'dynamically notify of 4 increments in total' in res


def test_close():
    """Test manual creation and closure and n_instances"""

    # With `leave` option
    with closing(StringIO()) as our_file:
        progressbar = tqdm(total=3, file=our_file, miniters=10)
        progressbar.update(3)
        assert '| 3/3 ' not in our_file.getvalue()  # Should be blank
        assert len(tqdm._instances) == 1
        progressbar.close()
        assert len(tqdm._instances) == 0
        assert '| 3/3 ' in our_file.getvalue()

    # Without `leave` option
    with closing(StringIO()) as our_file:
        progressbar = tqdm(total=3, file=our_file, miniters=10, leave=False)
        progressbar.update(3)
        progressbar.close()
        assert '| 3/3 ' not in our_file.getvalue()  # Should be blank

    # With all updates
    with closing(StringIO()) as our_file:
        assert len(tqdm._instances) == 0
        with tqdm(total=3, file=our_file, miniters=0, mininterval=0,
                  leave=True) as progressbar:
            assert len(tqdm._instances) == 1
            progressbar.update(3)
            res = our_file.getvalue()
            assert '| 3/3 ' in res  # Should be blank
            assert '\n' not in res
        # close() called
        assert len(tqdm._instances) == 0

        exres = res.rsplit(', ', 1)[0]
        res = our_file.getvalue()
        assert res[-1] == '\n'
        if not res.startswith(exres):
            raise AssertionError(f"\n<<< Expected:\n{exres}, ...it/s]\n>>> Got:\n{res}\n===")

    # Closing after the output stream has closed
    with closing(StringIO()) as our_file:
        t = tqdm(total=2, file=our_file)
        t.update()
        t.update()
    t.close()


def test_ema():
    """Test exponential weighted average"""
    ema = EMA(0.01)
    assert round(ema(10), 2) == 10
    assert round(ema(1), 2) == 5.48
    assert round(ema(), 2) == 5.48
    assert round(ema(1), 2) == 3.97
    assert round(ema(1), 2) == 3.22


def test_smoothing():
    """Test exponential weighted average smoothing"""
    timer = DiscreteTimer()

    # -- Test disabling smoothing
    with closing(StringIO()) as our_file:
        with tqdm(range(3), file=our_file, smoothing=None, leave=True) as t:
            cpu_timify(t, timer)

            for _ in t:
                pass
        assert '| 3/3 ' in our_file.getvalue()

    # -- Test smoothing
    # 1st case: no smoothing (only use average)
    with closing(StringIO()) as our_file2:
        with closing(StringIO()) as our_file:
            t = tqdm(range(3), file=our_file2, smoothing=None, leave=True,
                     miniters=1, mininterval=0)
            cpu_timify(t, timer)

            with tqdm(range(3), file=our_file, smoothing=None, leave=True,
                      miniters=1, mininterval=0) as t2:
                cpu_timify(t2, timer)

                for i in t2:
                    # Sleep more for first iteration and
                    # see how quickly rate is updated
                    if i == 0:
                        timer.sleep(0.01)
                    else:
                        # Need to sleep in all iterations
                        # to calculate smoothed rate
                        # (else delta_t is 0!)
                        timer.sleep(0.001)
                    t.update()
            n_old = len(tqdm._instances)
            t.close()
            assert len(tqdm._instances) == n_old - 1
            # Get result for iter-based bar
            a = progressbar_rate(get_bar(our_file.getvalue(), 3))
        # Get result for manually updated bar
        a2 = progressbar_rate(get_bar(our_file2.getvalue(), 3))

    # 2nd case: use max smoothing (= instant rate)
    with closing(StringIO()) as our_file2:
        with closing(StringIO()) as our_file:
            t = tqdm(range(3), file=our_file2, smoothing=1, leave=True,
                     miniters=1, mininterval=0)
            cpu_timify(t, timer)

            with tqdm(range(3), file=our_file, smoothing=1, leave=True,
                      miniters=1, mininterval=0) as t2:
                cpu_timify(t2, timer)

                for i in t2:
                    if i == 0:
                        timer.sleep(0.01)
                    else:
                        timer.sleep(0.001)
                    t.update()
            t.close()
            # Get result for iter-based bar
            b = progressbar_rate(get_bar(our_file.getvalue(), 3))
        # Get result for manually updated bar
        b2 = progressbar_rate(get_bar(our_file2.getvalue(), 3))

    # 3rd case: use medium smoothing
    with closing(StringIO()) as our_file2:
        with closing(StringIO()) as our_file:
            t = tqdm(range(3), file=our_file2, smoothing=0.5, leave=True,
                     miniters=1, mininterval=0)
            cpu_timify(t, timer)

            t2 = tqdm(range(3), file=our_file, smoothing=0.5, leave=True,
                      miniters=1, mininterval=0)
            cpu_timify(t2, timer)

            for i in t2:
                if i == 0:
                    timer.sleep(0.01)
                else:
                    timer.sleep(0.001)
                t.update()
            t2.close()
            t.close()
            # Get result for iter-based bar
            c = progressbar_rate(get_bar(our_file.getvalue(), 3))
        # Get result for manually updated bar
        c2 = progressbar_rate(get_bar(our_file2.getvalue(), 3))

    # Check that medium smoothing's rate is between no and max smoothing rates
    assert a <= c <= b
    assert a2 <= c2 <= b2


@mark.skipif(nt_and_no_colorama, reason="Windows without colorama")
def test_deprecated_nested():
    """Test nested progress bars"""
    # TODO: test degradation on windows without colorama?

    # Artificially test nested loop printing
    # Without leave
    our_file = StringIO()
    try:
        tqdm(total=2, file=our_file, nested=True)
    except TqdmDeprecationWarning:
        if """`nested` is deprecated and automated.
Use `position` instead for manual control.""" not in our_file.getvalue():
            raise
    else:
        raise DeprecationError("Should not allow nested kwarg")


def test_bar_format():
    """Test custom bar formatting"""
    with closing(StringIO()) as our_file:
        bar_format = ('{l_bar}{bar}|{n_fmt}/{total_fmt}-{n}/{total}'
                      '{percentage}{rate}{rate_fmt}{elapsed}{remaining}')
        for _ in trange(2, file=our_file, leave=True, bar_format=bar_format):
            pass
        out = our_file.getvalue()
    assert "\r  0%|          |0/2-0/20.0None?it/s00:00?\r" in out

    # Test unicode string auto conversion
    with closing(StringIO()) as our_file:
        bar_format = r'hello world'
        with tqdm(ascii=False, bar_format=bar_format, file=our_file) as t:
            assert isinstance(t.bar_format, str)


def test_custom_format():
    """Test adding additional derived format arguments"""
    class TqdmExtraFormat(tqdm):
        """Provides a `total_time` format parameter"""
        @property
        def format_dict(self):
            d = super().format_dict
            total_time = d["elapsed"] * (d["total"] or 0) / max(d["n"], 1)
            d.update(total_time=self.format_interval(total_time) + " in total")
            return d

    with closing(StringIO()) as our_file:
        for _ in TqdmExtraFormat(
                range(10), file=our_file,
                bar_format="{total_time}: {percentage:.0f}%|{bar}{r_bar}"):
            pass
        assert "00:00 in total" in our_file.getvalue()


def test_eta(capsys):
    """Test eta bar_format"""
    from datetime import datetime as dt
    for _ in trange(999, miniters=1, mininterval=0, leave=True,
                    bar_format='{l_bar}{eta:%Y-%m-%d}'):
        pass
    _, err = capsys.readouterr()
    assert f"\r100%|{dt.now():%Y-%m-%d}\n" in err


def test_unpause():
    """Test unpause"""
    timer = DiscreteTimer()
    with closing(StringIO()) as our_file:
        t = trange(10, file=our_file, leave=True, mininterval=0)
        cpu_timify(t, timer)
        timer.sleep(0.01)
        t.update()
        timer.sleep(0.01)
        t.update()
        timer.sleep(0.1)  # longer wait time
        t.unpause()
        timer.sleep(0.01)
        t.update()
        timer.sleep(0.01)
        t.update()
        t.close()
        r_before = progressbar_rate(get_bar(our_file.getvalue(), 2))
        r_after = progressbar_rate(get_bar(our_file.getvalue(), 3))
    assert r_before == r_after


def test_disabled_unpause(capsys):
    """Test disabled unpause"""
    with tqdm(total=10, disable=True) as t:
        t.update()
        t.unpause()
        t.update()
        print(t)
    out, err = capsys.readouterr()
    assert not err
    assert out == '  0%|          | 0/10 [00:00<?, ?it/s]\n'


def test_reset():
    """Test resetting a bar for re-use"""
    with closing(StringIO()) as our_file:
        with tqdm(total=10, file=our_file,
                  miniters=1, mininterval=0, maxinterval=0) as t:
            t.update(9)
            t.reset()
            t.update()
            t.reset(total=12)
            t.update(10)
        assert '| 1/10' in our_file.getvalue()
        assert '| 10/12' in our_file.getvalue()


def test_disabled_reset(capsys):
    """Test disabled reset"""
    with tqdm(total=10, disable=True) as t:
        t.update(9)
        t.reset()
        t.update()
        t.reset(total=12)
        t.update(10)
        print(t)
    out, err = capsys.readouterr()
    assert not err
    assert out == '  0%|          | 0/12 [00:00<?, ?it/s]\n'


@mark.skipif(nt_and_no_colorama, reason="Windows without colorama")
def test_position():
    """Test positioned progress bars"""
    # Artificially test nested loop printing
    # Without leave
    our_file = StringIO()
    kwargs = {'file': our_file, 'miniters': 1, 'mininterval': 0, 'maxinterval': 0}
    t = tqdm(total=2, desc='pos2 bar', leave=False, position=2, **kwargs)
    t.update()
    t.close()
    out = our_file.getvalue()
    res = [m[0] for m in RE_pos.findall(out)]
    exres = ['\n\n\rpos2 bar:   0%',
             '\n\n\rpos2 bar:  50%',
             '\n\n\r      ']

    pos_line_diff(res, exres)

    # Test iteration-based tqdm positioning
    our_file = StringIO()
    kwargs["file"] = our_file
    for _ in trange(2, desc='pos0 bar', position=0, **kwargs):
        for _ in trange(2, desc='pos1 bar', position=1, **kwargs):
            for _ in trange(2, desc='pos2 bar', position=2, **kwargs):
                pass
    out = our_file.getvalue()
    res = [m[0] for m in RE_pos.findall(out)]
    exres = ['\rpos0 bar:   0%',
             '\n\rpos1 bar:   0%',
             '\n\n\rpos2 bar:   0%',
             '\n\n\rpos2 bar:  50%',
             '\n\n\rpos2 bar: 100%',
             '\rpos2 bar: 100%',
             '\n\n\rpos1 bar:  50%',
             '\n\n\rpos2 bar:   0%',
             '\n\n\rpos2 bar:  50%',
             '\n\n\rpos2 bar: 100%',
             '\rpos2 bar: 100%',
             '\n\n\rpos1 bar: 100%',
             '\rpos1 bar: 100%',
             '\n\rpos0 bar:  50%',
             '\n\rpos1 bar:   0%',
             '\n\n\rpos2 bar:   0%',
             '\n\n\rpos2 bar:  50%',
             '\n\n\rpos2 bar: 100%',
             '\rpos2 bar: 100%',
             '\n\n\rpos1 bar:  50%',
             '\n\n\rpos2 bar:   0%',
             '\n\n\rpos2 bar:  50%',
             '\n\n\rpos2 bar: 100%',
             '\rpos2 bar: 100%',
             '\n\n\rpos1 bar: 100%',
             '\rpos1 bar: 100%',
             '\n\rpos0 bar: 100%',
             '\rpos0 bar: 100%',
             '\n']
    pos_line_diff(res, exres)

    # Test manual tqdm positioning
    our_file = StringIO()
    kwargs["file"] = our_file
    kwargs["total"] = 2
    t1 = tqdm(desc='pos0 bar', position=0, **kwargs)
    t2 = tqdm(desc='pos1 bar', position=1, **kwargs)
    t3 = tqdm(desc='pos2 bar', position=2, **kwargs)
    for _ in range(2):
        t1.update()
        t3.update()
        t2.update()
    out = our_file.getvalue()
    res = [m[0] for m in RE_pos.findall(out)]
    exres = ['\rpos0 bar:   0%',
             '\n\rpos1 bar:   0%',
             '\n\n\rpos2 bar:   0%',
             '\rpos0 bar:  50%',
             '\n\n\rpos2 bar:  50%',
             '\n\rpos1 bar:  50%',
             '\rpos0 bar: 100%',
             '\n\n\rpos2 bar: 100%',
             '\n\rpos1 bar: 100%']
    pos_line_diff(res, exres)
    t1.close()
    t2.close()
    t3.close()

    # Test auto repositioning of bars when a bar is prematurely closed
    # tqdm._instances.clear()  # reset number of instances
    with closing(StringIO()) as our_file:
        t1 = tqdm(total=10, file=our_file, desc='1.pos0 bar', mininterval=0)
        t2 = tqdm(total=10, file=our_file, desc='2.pos1 bar', mininterval=0)
        t3 = tqdm(total=10, file=our_file, desc='3.pos2 bar', mininterval=0)
        res = [m[0] for m in RE_pos.findall(our_file.getvalue())]
        exres = ['\r1.pos0 bar:   0%',
                 '\n\r2.pos1 bar:   0%',
                 '\n\n\r3.pos2 bar:   0%']
        pos_line_diff(res, exres)

        t2.close()
        t4 = tqdm(total=10, file=our_file, desc='4.pos2 bar', mininterval=0)
        t1.update(1)
        t3.update(1)
        t4.update(1)
        res = [m[0] for m in RE_pos.findall(our_file.getvalue())]
        exres = ['\r1.pos0 bar:   0%',
                 '\n\r2.pos1 bar:   0%',
                 '\n\n\r3.pos2 bar:   0%',
                 '\r2.pos1 bar:   0%',
                 '\n\n\r4.pos2 bar:   0%',
                 '\r1.pos0 bar:  10%',
                 '\n\n\r3.pos2 bar:  10%',
                 '\n\r4.pos2 bar:  10%']
        pos_line_diff(res, exres)
        t4.close()
        t3.close()
        t1.close()


def test_set_description():
    """Test set description"""
    with closing(StringIO()) as our_file:
        with tqdm(desc='Hello', file=our_file) as t:
            assert t.desc == 'Hello'
            t.set_description_str('World')
            assert t.desc == 'World'
            t.set_description()
            assert t.desc == ''
            t.set_description('Bye')
            assert t.desc == 'Bye: '
        assert "World" in our_file.getvalue()

    # without refresh
    with closing(StringIO()) as our_file:
        with tqdm(desc='Hello', file=our_file) as t:
            assert t.desc == 'Hello'
            t.set_description_str('World', False)
            assert t.desc == 'World'
            t.set_description(None, False)
            assert t.desc == ''
        assert "World" not in our_file.getvalue()

    # unicode
    with closing(StringIO()) as our_file:
        with tqdm(total=10, file=our_file) as t:
            t.set_description(u"\xe1\xe9\xed\xf3\xfa")


def test_deprecated_gui():
    """Test internal GUI properties"""
    # Check: StatusPrinter iff gui is disabled
    with closing(StringIO()) as our_file:
        t = tqdm(total=2, gui=True, file=our_file, miniters=1, mininterval=0)
        assert not hasattr(t, "sp")
        try:
            t.update(1)
        except TqdmDeprecationWarning as e:
            if (
                'Please use `tqdm.gui.tqdm(...)` instead of `tqdm(..., gui=True)`'
                not in our_file.getvalue()
            ):
                raise e
        else:
            raise DeprecationError('Should not allow manual gui=True without'
                                   ' overriding __iter__() and update()')
        finally:
            t._instances.clear()
            # t.close()
            # len(tqdm._instances) += 1  # undo the close() decrement

        t = tqdm(range(3), gui=True, file=our_file, miniters=1, mininterval=0)
        try:
            for _ in t:
                pass
        except TqdmDeprecationWarning as e:
            if (
                'Please use `tqdm.gui.tqdm(...)` instead of `tqdm(..., gui=True)`'
                not in our_file.getvalue()
            ):
                raise e
        else:
            raise DeprecationError('Should not allow manual gui=True without'
                                   ' overriding __iter__() and update()')
        finally:
            t._instances.clear()
            # t.close()
            # len(tqdm._instances) += 1  # undo the close() decrement

        with tqdm(total=1, gui=False, file=our_file) as t:
            assert hasattr(t, "sp")


def test_cmp():
    """Test comparison functions"""
    with closing(StringIO()) as our_file:
        t0 = tqdm(total=10, file=our_file)
        t1 = tqdm(total=10, file=our_file)
        t2 = tqdm(total=10, file=our_file)

        assert t0 < t1
        assert t2 >= t0
        assert t0 <= t2

        t3 = tqdm(total=10, file=our_file)
        t4 = tqdm(total=10, file=our_file)
        t5 = tqdm(total=10, file=our_file)
        t5.close()
        t6 = tqdm(total=10, file=our_file)

        assert t3 != t4
        assert t3 > t2
        assert t5 == t6
        t6.close()
        t4.close()
        t3.close()
        t2.close()
        t1.close()
        t0.close()


def test_repr():
    """Test representation"""
    with closing(StringIO()) as our_file:
        with tqdm(total=10, ascii=True, file=our_file) as t:
            assert str(t) == '  0%|          | 0/10 [00:00<?, ?it/s]'


def test_clear():
    """Test clearing bar display"""
    with closing(StringIO()) as our_file:
        t1 = tqdm(total=10, file=our_file, desc='pos0 bar', bar_format='{l_bar}')
        t2 = trange(10, file=our_file, desc='pos1 bar', bar_format='{l_bar}')
        before = squash_ctrlchars(our_file.getvalue())
        t2.clear()
        t1.clear()
        after = squash_ctrlchars(our_file.getvalue())
        t1.close()
        t2.close()
        assert before == ['pos0 bar:   0%|', 'pos1 bar:   0%|']
        assert after == ['', '']


def test_clear_disabled():
    """Test disabled clear"""
    with closing(StringIO()) as our_file:
        with tqdm(total=10, file=our_file, desc='pos0 bar', disable=True,
                  bar_format='{l_bar}') as t:
            t.clear()
        assert our_file.getvalue() == ''


def test_refresh():
    """Test refresh bar display"""
    with closing(StringIO()) as our_file:
        t1 = tqdm(total=10, file=our_file, desc='pos0 bar',
                  bar_format='{l_bar}', mininterval=999, miniters=999)
        t2 = tqdm(total=10, file=our_file, desc='pos1 bar',
                  bar_format='{l_bar}', mininterval=999, miniters=999)
        t1.update()
        t2.update()
        before = squash_ctrlchars(our_file.getvalue())
        t1.refresh()
        t2.refresh()
        after = squash_ctrlchars(our_file.getvalue())
        t1.close()
        t2.close()

        # Check that refreshing indeed forced the display to use realtime state
        assert before == [u'pos0 bar:   0%|', u'pos1 bar:   0%|']
        assert after == [u'pos0 bar:  10%|', u'pos1 bar:  10%|']


def test_disabled_repr(capsys):
    """Test disabled repr"""
    with tqdm(total=10, disable=True) as t:
        str(t)
        t.update()
        print(t)
    out, err = capsys.readouterr()
    assert not err
    assert out == '  0%|          | 0/10 [00:00<?, ?it/s]\n'


def test_disabled_refresh():
    """Test disabled refresh"""
    with closing(StringIO()) as our_file:
        with tqdm(total=10, file=our_file, desc='pos0 bar', disable=True,
                  bar_format='{l_bar}', mininterval=999, miniters=999) as t:
            t.update()
            t.refresh()

        assert our_file.getvalue() == ''


def test_write():
    """Test write messages"""
    s = "Hello world"
    with closing(StringIO()) as our_file:
        # Change format to keep only left part w/o bar and it/s rate
        t1 = tqdm(total=10, file=our_file, desc='pos0 bar',
                  bar_format='{l_bar}', mininterval=0, miniters=1)
        t2 = trange(10, file=our_file, desc='pos1 bar', bar_format='{l_bar}',
                    mininterval=0, miniters=1)
        t3 = tqdm(total=10, file=our_file, desc='pos2 bar',
                  bar_format='{l_bar}', mininterval=0, miniters=1)
        t1.update()
        t2.update()
        t3.update()
        before = our_file.getvalue()

        # Write msg and see if bars are correctly redrawn below the msg
        t1.write(s, file=our_file)  # call as an instance method
        tqdm.write(s, file=our_file)  # call as a class method
        after = our_file.getvalue()

        t1.close()
        t2.close()
        t3.close()

        before_squashed = squash_ctrlchars(before)
        after_squashed = squash_ctrlchars(after)

        assert after_squashed == [s, s] + before_squashed

    # Check that no bar clearing if different file
    with closing(StringIO()) as our_file_bar:
        with closing(StringIO()) as our_file_write:
            t1 = tqdm(total=10, file=our_file_bar, desc='pos0 bar',
                      bar_format='{l_bar}', mininterval=0, miniters=1)

            t1.update()
            before_bar = our_file_bar.getvalue()

            tqdm.write(s, file=our_file_write)

            after_bar = our_file_bar.getvalue()
            t1.close()

            assert before_bar == after_bar

    # Test stdout/stderr anti-mixup strategy
    # Backup stdout/stderr
    stde = sys.stderr
    stdo = sys.stdout
    # Mock stdout/stderr
    with closing(StringIO()) as our_stderr:
        with closing(StringIO()) as our_stdout:
            sys.stderr = our_stderr
            sys.stdout = our_stdout
            t1 = tqdm(total=10, file=sys.stderr, desc='pos0 bar',
                      bar_format='{l_bar}', mininterval=0, miniters=1)

            t1.update()
            before_err = sys.stderr.getvalue()
            before_out = sys.stdout.getvalue()

            tqdm.write(s, file=sys.stdout)
            after_err = sys.stderr.getvalue()
            after_out = sys.stdout.getvalue()

            t1.close()

            assert before_err == '\rpos0 bar:   0%|\rpos0 bar:  10%|'
            assert before_out == ''
            after_err_res = [m[0] for m in RE_pos.findall(after_err)]
            exres = ['\rpos0 bar:   0%|',
                     '\rpos0 bar:  10%|',
                     '\r               ',
                     '\r\rpos0 bar:  10%|']
            pos_line_diff(after_err_res, exres)
            assert after_out == s + '\n'
    # Restore stdout and stderr
    sys.stderr = stde
    sys.stdout = stdo


def test_len():
    """Test advance len (numpy array shape)"""
    np = importorskip('numpy')
    with closing(StringIO()) as f:
        with tqdm(np.zeros((3, 4)), file=f) as t:
            assert len(t) == 3


def test_autodisable_disable():
    """Test autodisable will disable on non-TTY"""
    with closing(StringIO()) as our_file:
        with tqdm(total=10, disable=None, file=our_file) as t:
            t.update(3)
        assert our_file.getvalue() == ''


def test_autodisable_enable():
    """Test autodisable will not disable on TTY"""
    with closing(StringIO()) as our_file:
        our_file.isatty = lambda: True
        with tqdm(total=10, disable=None, file=our_file) as t:
            t.update()
        assert our_file.getvalue() != ''


def test_deprecation_exception():
    def test_TqdmDeprecationWarning():
        with closing(StringIO()) as our_file:
            raise (TqdmDeprecationWarning('Test!', fp_write=getattr(
                our_file, 'write', sys.stderr.write)))

    def test_TqdmDeprecationWarning_nofpwrite():
        raise TqdmDeprecationWarning('Test!', fp_write=None)

    raises(TqdmDeprecationWarning, test_TqdmDeprecationWarning)
    raises(Exception, test_TqdmDeprecationWarning_nofpwrite)


def test_postfix():
    """Test postfix"""
    postfix = {'float': 0.321034, 'gen': 543, 'str': 'h', 'lst': [2]}
    postfix_order = (('w', 'w'), ('a', 0))  # no need for OrderedDict
    expected = ['float=0.321', 'gen=543', 'lst=[2]', 'str=h']
    expected_order = ['w=w', 'a=0', 'float=0.321', 'gen=543', 'lst=[2]', 'str=h']

    # Test postfix set at init
    with closing(StringIO()) as our_file:
        with tqdm(total=10, file=our_file, desc='pos0 bar',
                  bar_format='{r_bar}', postfix=postfix) as t1:
            t1.refresh()
            out = our_file.getvalue()

    # Test postfix set after init
    with closing(StringIO()) as our_file:
        with trange(10, file=our_file, desc='pos1 bar', bar_format='{r_bar}',
                    postfix=None) as t2:
            t2.set_postfix(**postfix)
            t2.refresh()
            out2 = our_file.getvalue()

    # Order of items in dict may change, so need a loop to check per item
    for res in expected:
        assert res in out
        assert res in out2

    # Test postfix (with ordered dict and no refresh) set after init
    with closing(StringIO()) as our_file:
        with trange(10, file=our_file, desc='pos2 bar', bar_format='{r_bar}',
                    postfix=None) as t3:
            t3.set_postfix(postfix_order, False, **postfix)
            t3.refresh()  # explicit external refresh
            out3 = our_file.getvalue()

    out3 = out3[1:-1].split(', ')[3:]
    assert out3 == expected_order

    # Test postfix (with ordered dict and refresh) set after init
    with closing(StringIO()) as our_file:
        with trange(10, file=our_file, desc='pos2 bar',
                    bar_format='{r_bar}', postfix=None) as t4:
            t4.set_postfix(postfix_order, True, **postfix)
            t4.refresh()  # double refresh
            out4 = our_file.getvalue()

    assert out4.count('\r') > out3.count('\r')
    assert out4.count(", ".join(expected_order)) == 2

    # Test setting postfix string directly
    with closing(StringIO()) as our_file:
        with trange(10, file=our_file, desc='pos2 bar', bar_format='{r_bar}',
                    postfix=None) as t5:
            t5.set_postfix_str("Hello", False)
            t5.set_postfix_str("World")
            out5 = our_file.getvalue()

    assert "Hello" not in out5
    out5 = out5[1:-1].split(', ')[3:]
    assert out5 == ["World"]


def test_postfix_direct():
    """Test directly assigning non-str objects to postfix"""
    with closing(StringIO()) as our_file:
        with tqdm(total=10, file=our_file, miniters=1, mininterval=0,
                  bar_format="{postfix[0][name]} {postfix[1]:>5.2f}",
                  postfix=[{'name': "foo"}, 42]) as t:
            for i in range(10):
                if i % 2:
                    t.postfix[0]["name"] = "abcdefghij"[i]
                else:
                    t.postfix[1] = i
                t.update()
        res = our_file.getvalue()
        assert "f  6.00" in res
        assert "h  6.00" in res
        assert "h  8.00" in res
        assert "j  8.00" in res


@contextmanager
def std_out_err_redirect_tqdm(tqdm_file=sys.stderr):
    orig_out_err = sys.stdout, sys.stderr
    try:
        sys.stdout = sys.stderr = DummyTqdmFile(tqdm_file)
        yield orig_out_err[0]
    # Relay exceptions
    except Exception as exc:
        raise exc
    # Always restore sys.stdout/err if necessary
    finally:
        sys.stdout, sys.stderr = orig_out_err


def test_file_redirection():
    """Test redirection of output"""
    with closing(StringIO()) as our_file:
        # Redirect stdout to tqdm.write()
        with std_out_err_redirect_tqdm(tqdm_file=our_file):
            with tqdm(total=3) as pbar:
                print("Such fun")
                pbar.update(1)
                print("Such", "fun")
                pbar.update(1)
                print("Such ", end="")
                print("fun")
                pbar.update(1)
        res = our_file.getvalue()
        assert res.count("Such fun\n") == 3
        assert "0/3" in res
        assert "3/3" in res


def test_external_write():
    """Test external write mode"""
    with closing(StringIO()) as our_file:
        # Redirect stdout to tqdm.write()
        for _ in trange(3, file=our_file):
            del tqdm._lock  # classmethod should be able to recreate lock
            with tqdm.external_write_mode(file=our_file):
                our_file.write("Such fun\n")
        res = our_file.getvalue()
        assert res.count("Such fun\n") == 3
        assert "0/3" in res
        assert "3/3" in res


def test_unit_scale():
    """Test numeric `unit_scale`"""
    with closing(StringIO()) as our_file:
        for _ in tqdm(range(9), unit_scale=9, file=our_file,
                      miniters=1, mininterval=0):
            pass
        out = our_file.getvalue()
        assert '81/81' in out


def patch_lock(thread=True):
    """decorator replacing tqdm's lock with vanilla threading/multiprocessing"""
    try:
        if thread:
            from threading import RLock
        else:
            from multiprocessing import RLock
        lock = RLock()
    except (ImportError, OSError) as err:
        skip(str(err))

    def outer(func):
        """actual decorator"""
        @wraps(func)
        def inner(*args, **kwargs):
            """set & reset lock even if exceptions occur"""
            default_lock = tqdm.get_lock()
            try:
                tqdm.set_lock(lock)
                return func(*args, **kwargs)
            finally:
                tqdm.set_lock(default_lock)
        return inner
    return outer


@patch_lock(thread=False)
def test_threading():
    """Test multiprocess/thread-realted features"""
    pass  # TODO: test interleaved output #445


def test_bool():
    """Test boolean cast"""
    def internal(our_file, disable):
        kwargs = {'file': our_file, 'disable': disable}
        with trange(10, **kwargs) as t:
            assert t
        with trange(0, **kwargs) as t:
            assert not t
        with tqdm(total=10, **kwargs) as t:
            assert bool(t)
        with tqdm(total=0, **kwargs) as t:
            assert not bool(t)
        with tqdm([], **kwargs) as t:
            assert not t
        with tqdm([0], **kwargs) as t:
            assert t
        with tqdm(iter([]), **kwargs) as t:
            assert t
        with tqdm(iter([1, 2, 3]), **kwargs) as t:
            assert t
        with tqdm(**kwargs) as t:
            try:
                print(bool(t))
            except TypeError:
                pass
            else:
                raise TypeError("Expected bool(tqdm()) to fail")

    # test with and without disable
    with closing(StringIO()) as our_file:
        internal(our_file, False)
        internal(our_file, True)


def backendCheck(module):
    """Test tqdm-like module fallback"""
    tn = module.tqdm
    tr = module.trange

    with closing(StringIO()) as our_file:
        with tn(total=10, file=our_file) as t:
            assert len(t) == 10
        with tr(1337) as t:
            assert len(t) == 1337


def test_auto():
    """Test auto fallback"""
    from tqdm import auto, autonotebook
    backendCheck(autonotebook)
    backendCheck(auto)


def test_wrapattr():
    """Test wrapping file-like objects"""
    data = "a twenty-char string"

    with closing(StringIO()) as our_file:
        with closing(StringIO()) as writer:
            with tqdm.wrapattr(writer, "write", file=our_file, bytes=True) as wrap:
                wrap.write(data)
            res = writer.getvalue()
            assert data == res
        res = our_file.getvalue()
        assert '%.1fB [' % len(data) in res

    with closing(StringIO()) as our_file:
        with closing(StringIO()) as writer:
            with tqdm.wrapattr(writer, "write", file=our_file, bytes=False) as wrap:
                wrap.write(data)
        res = our_file.getvalue()
        assert '%dit [' % len(data) in res


def test_float_progress():
    """Test float totals"""
    with closing(StringIO()) as our_file:
        with trange(10, total=9.6, file=our_file) as t:
            with catch_warnings(record=True) as w:
                simplefilter("always", category=TqdmWarning)
                for i in t:
                    if i < 9:
                        assert not w
                assert w
                assert "clamping frac" in str(w[-1].message)


def test_screen_shape():
    """Test screen shape"""
    # ncols
    with closing(StringIO()) as our_file:
        with trange(10, file=our_file, ncols=50) as t:
            list(t)

        res = our_file.getvalue()
        assert all(len(i) == 50 for i in get_bar(res))

    # no second/third bar, leave=False
    with closing(StringIO()) as our_file:
        kwargs = {'file': our_file, 'ncols': 50, 'nrows': 2, 'miniters': 0,
                  'mininterval': 0, 'leave': False}
        with trange(10, desc="one", **kwargs) as t1:
            with trange(10, desc="two", **kwargs) as t2:
                with trange(10, desc="three", **kwargs) as t3:
                    list(t3)
                list(t2)
            list(t1)

        res = our_file.getvalue()
        assert "one" in res
        assert "two" not in res
        assert "three" not in res
        assert "\n\n" not in res
        assert "more hidden" in res
        # double-check ncols
        assert all(len(i) == 50 for i in get_bar(res)
                   if i.strip() and "more hidden" not in i)

    # all bars, leave=True
    with closing(StringIO()) as our_file:
        kwargs = {'file': our_file, 'ncols': 50, 'nrows': 2,
                  'miniters': 0, 'mininterval': 0}
        with trange(10, desc="one", **kwargs) as t1:
            with trange(10, desc="two", **kwargs) as t2:
                assert "two" not in our_file.getvalue()
                with trange(10, desc="three", **kwargs) as t3:
                    assert "three" not in our_file.getvalue()
                    list(t3)
                list(t2)
            list(t1)

        res = our_file.getvalue()
        assert "one" in res
        assert "two" in res
        assert "three" in res
        assert "\n\n" not in res
        assert "more hidden" in res
        # double-check ncols
        assert all(len(i) == 50 for i in get_bar(res)
                   if i.strip() and "more hidden" not in i)

    # second bar becomes first, leave=False
    with closing(StringIO()) as our_file:
        kwargs = {'file': our_file, 'ncols': 50, 'nrows': 2, 'miniters': 0,
                  'mininterval': 0, 'leave': False}
        t1 = tqdm(total=10, desc="one", **kwargs)
        with tqdm(total=10, desc="two", **kwargs) as t2:
            t1.update()
            t2.update()
            t1.close()
            res = our_file.getvalue()
            assert "one" in res
            assert "two" not in res
            assert "more hidden" in res
            t2.update()

        res = our_file.getvalue()
        assert "two" in res


def test_initial():
    """Test `initial`"""
    with closing(StringIO()) as our_file:
        for _ in tqdm(range(9), initial=10, total=19, file=our_file,
                      miniters=1, mininterval=0):
            pass
        out = our_file.getvalue()
        assert '10/19' in out
        assert '19/19' in out


def test_colour():
    """Test `colour`"""
    with closing(StringIO()) as our_file:
        for _ in tqdm(range(9), file=our_file, colour="#beefed"):
            pass
        out = our_file.getvalue()
        assert '\x1b[38;2;%d;%d;%dm' % (0xbe, 0xef, 0xed) in out

        with catch_warnings(record=True) as w:
            simplefilter("always", category=TqdmWarning)
            with tqdm(total=1, file=our_file, colour="charm") as t:
                assert w
                t.update()
            assert "Unknown colour" in str(w[-1].message)

    with closing(StringIO()) as our_file2:
        for _ in tqdm(range(9), file=our_file2, colour="blue"):
            pass
        out = our_file2.getvalue()
        assert '\x1b[34m' in out


def test_closed():
    """Test writing to closed file"""
    with closing(StringIO()) as our_file:
        for i in trange(9, file=our_file, miniters=1, mininterval=0):
            if i == 5:
                our_file.close()


def test_reversed(capsys):
    """Test reversed()"""
    for _ in reversed(tqdm(range(9))):
        pass
    out, err = capsys.readouterr()
    assert not out
    assert '  0%' in err
    assert '100%' in err


def test_contains(capsys):
    """Test __contains__ doesn't iterate"""
    with tqdm(list(range(9))) as t:
        assert 9 not in t
        assert all(i in t for i in range(9))
    out, err = capsys.readouterr()
    assert not out
    assert '  0%' in err
    assert '100%' not in err