# Path: tests/testing/capture_subprocess.py
# def capture_subprocess(cmd, encoding='UTF-8', **popen_kwargs):
#     """Run a command, showing its usual outputs in real time,
#     and return its stdout, stderr output as strings.
# 
#     No temporary files are used.
#     """
#     stdout = Pty()  # libc uses full buffering for stdout if it doesn't see a tty
#     stderr = Pipe()
# 
#     # deadlocks occur if we have any write-end of a pipe open more than once
#     # best practice: close any used write pipes just after spawn
#     outputter = Popen(
#         cmd,
#         stdout=stdout.write,
#         stderr=stderr.write,
#         **popen_kwargs
#     )
#     stdout.readonly()  # deadlock otherwise
#     stderr.readonly()  # deadlock otherwise
# 
#     # start one tee each on the original stdout and stderr
#     # writing each to three places:
#     #    1. the original destination
#     #    2. a pipe just for that one stream
#     stdout_tee = Tee(stdout.read, STDOUT)
#     stderr_tee = Tee(stderr.read, STDERR)
# 
#     # clean up left-over processes and pipes:
#     exit_code = outputter.wait()
#     result = (stdout_tee.join(), stderr_tee.join())
# 
#     result = tuple(
#         bytestring.decode(encoding)
#         for bytestring in result
#     )
# 
#     if exit_code == 0:
#         return result
#     else:
#         error = CalledProcessError(exit_code, cmd)
#         error.result = result
#         raise error


from .capture_subprocess import capture_subprocess
from testing import coverage_warnings_regex
    from venv_update import check_output
    from sys import executable
    from testing.capture_subprocess import __file__ as script
seed(0)  # unpredictable, but repeatable

# system should not deadlock for any given value of these parameters.
LINES = 4000
TIME = 0
WIDTH = 179
ERROR_RATIO = .20

for i in range(LINES):
    if random() > ERROR_RATIO:
        char = '.'
        file = stdout
    else:
        char = '%'
        file = stderr

    for j in range(WIDTH):
        print(char, file=file, end='')
        file.flush()
        sleep(TIME / LINES / WIDTH)
    print(file=file)
    file.flush()
''')


def test_capture_subprocess(tmpdir):
    tmpdir.chdir()
    make_outputter()

    cmd = ('python', 'outputter.py')

# Path: tests/testing/capture_subprocess.py
# def capture_subprocess(cmd, encoding='UTF-8', **popen_kwargs):
#     """Run a command, showing its usual outputs in real time,
#     and return its stdout, stderr output as strings.
# 
#     No temporary files are used.
#     """
#     stdout = Pty()  # libc uses full buffering for stdout if it doesn't see a tty
#     stderr = Pipe()
# 
#     # deadlocks occur if we have any write-end of a pipe open more than once
#     # best practice: close any used write pipes just after spawn
#     outputter = Popen(
#         cmd,
#         stdout=stdout.write,
#         stderr=stderr.write,
#         **popen_kwargs
#     )
#     stdout.readonly()  # deadlock otherwise
#     stderr.readonly()  # deadlock otherwise
# 
#     # start one tee each on the original stdout and stderr
#     # writing each to three places:
#     #    1. the original destination
#     #    2. a pipe just for that one stream
#     stdout_tee = Tee(stdout.read, STDOUT)
#     stderr_tee = Tee(stderr.read, STDERR)
# 
#     # clean up left-over processes and pipes:
#     exit_code = outputter.wait()
#     result = (stdout_tee.join(), stderr_tee.join())
# 
#     result = tuple(
#         bytestring.decode(encoding)
#         for bytestring in result
#     )
# 
#     if exit_code == 0:
#         return result
#     else:
#         error = CalledProcessError(exit_code, cmd)
#         error.result = result
#         raise error


# Path: tests/testing/capture_subprocess_test.py
from .capture_subprocess import capture_subprocess
from testing import coverage_warnings_regex
    from venv_update import check_output
    from sys import executable
    from testing.capture_subprocess import __file__ as script

seed(0)  # unpredictable, but repeatable

# system should not deadlock for any given value of these parameters.
LINES = 4000
TIME = 0
WIDTH = 179
ERROR_RATIO = .20

for i in range(LINES):
    if random() > ERROR_RATIO:
        char = '.'
        file = stdout
    else:
        char = '%'
        file = stderr

    for j in range(WIDTH):
        print(char, file=file, end='')
        file.flush()
        sleep(TIME / LINES / WIDTH)
    print(file=file)
    file.flush()
''')


def test_capture_subprocess(tmpdir):
    tmpdir.chdir()
    make_outputter()

    cmd = ('python', 'outputter.py')

    stdout, stderr = capture_subprocess(cmd)