# Path: graphviz/_tools.py
# def attach(object: typing.Any, name: str) -> typing.Callable:
#     def decorator(func):
# def mkdirs(filename, *, mode: int = 0o777) -> None:
# def mapping_items(mapping):
# def promote_pathlike(filepath: typing.Union[os.PathLike, str]
#                      ) -> pathlib.Path:
# def promote_pathlike(filepath: None) -> None:
# def promote_pathlike(filepath: typing.Union[os.PathLike, str, None]
#                      ) -> typing.Optional[pathlib.Path]:
# def promote_pathlike(filepath: typing.Union[os.PathLike, str, None]
#                      ) -> typing.Optional[pathlib.Path]:
# def promote_pathlike_directory(directory: typing.Union[os.PathLike, str, None], *,
#                                default: typing.Union[os.PathLike, str, None] = None,
#                                ) -> pathlib.Path:
# def deprecate_positional_args(*,
#                               supported_number: int,
#                               category: typing.Type[Warning] = PendingDeprecationWarning,
#                               stacklevel: int = 1):
#         def nulldecorator(func):
#     def decorator(func):
#         def wrapper(*args, **kwargs):
# 
# Path: graphviz/backend/rendering.py
# def get_format(outfile: pathlib.Path, *, format: typing.Optional[str]) -> str:
# def get_supported_suffixes() -> typing.List[str]:
# def get_supported_formats() -> typing.List[str]:
# def infer_format(outfile: pathlib.Path) -> str:
# def get_outfile(filepath: typing.Union[os.PathLike, str], *,
#                 format: str,
#                 renderer: typing.Optional[str] = None,
#                 formatter: typing.Optional[str] = None) -> pathlib.Path:
# def get_filepath(outfile: typing.Union[os.PathLike, str]) -> pathlib.Path:
# def render(engine: str,
#            format: str,
#            filepath: typing.Union[os.PathLike, str],
#            renderer: typing.Optional[str] = ...,
#            formatter: typing.Optional[str] = ...,
#            quiet: bool = ..., *,
#            outfile: typing.Union[os.PathLike, str, None] = ...,
#            raise_if_result_exists: bool = ...,
#            overwrite_filepath: bool = ...) -> str:
# def render(engine: str,
#            format: typing.Optional[str] = ...,
#            filepath: typing.Union[os.PathLike, str, None] = ...,
#            renderer: typing.Optional[str] = ...,
#            formatter: typing.Optional[str] = ...,
#            quiet: bool = False, *,
#            outfile: typing.Union[os.PathLike, str, None] = ...,
#            raise_if_result_exists: bool = ...,
#            overwrite_filepath: bool = ...) -> str:
# def render(engine: str,
#            format: typing.Optional[str] = ...,
#            filepath: typing.Union[os.PathLike, str, None] = ...,
#            renderer: typing.Optional[str] = ...,
#            formatter: typing.Optional[str] = ...,
#            quiet: bool = False, *,
#            outfile: typing.Union[os.PathLike, str, None] = ...,
#            raise_if_result_exists: bool = ...,
#            overwrite_filepath: bool = ...) -> str:
# def render(engine: str,
#            format: typing.Optional[str] = None,
#            filepath: typing.Union[os.PathLike, str, None] = None,
#            renderer: typing.Optional[str] = None,
#            formatter: typing.Optional[str] = None,
#            quiet: bool = False, *,
#            outfile: typing.Union[os.PathLike, str, None] = None,
#            raise_if_result_exists: bool = False,
#            overwrite_filepath: bool = False) -> str:


import pathlib
import os
import shutil
import subprocess
import pytest
import graphviz
import _common
from graphviz import _tools
from graphviz.backend import rendering
     ('spam.dot', 'plain', 'plain', graphviz.FormatSuffixMismatchWarning,
      r"expected format 'dot' from outfile differs from given format: 'plain'"),
     ('spam', 'svg', 'svg', graphviz.UnknownSuffixWarning,
      r"unknown outfile suffix '' \(expected: '\.svg'\)"),
     ('spam.peng', 'png', 'png', graphviz.UnknownSuffixWarning,
      r"unknown outfile suffix '.peng' \(expected: '\.png'\)"),
     ('spam', 'pdf', 'pdf', graphviz.UnknownSuffixWarning,
      r"unknown outfile suffix '' \(expected: '\.pdf'\)")])
def test_get_format_warns(outfile_name, format, expected_result,
                          expected_warning, match):
    outfile = pathlib.Path(outfile_name)

    with pytest.warns(expected_warning, match=match):
        result = rendering.get_format(outfile, format=format)

    assert result == expected_result


@pytest.mark.parametrize(
    'outfile_name,  expected_exception, match',
    [('spam', graphviz.RequiredArgumentError,
      r"cannot infer rendering format from suffix '' of outfile: 'spam'"),
     ('spam.peng', graphviz.RequiredArgumentError,
      r"cannot infer rendering format from suffix '.peng' of outfile: 'spam.peng'"),
     ('spam.wav', graphviz.RequiredArgumentError,
      r"cannot infer rendering format from suffix '.wav' of outfile: 'spam.wav'")])
def test_get_format_raises(outfile_name, expected_exception, match):
    outfile = pathlib.Path(outfile_name)

    with pytest.raises(expected_exception, match=match):

# Path: graphviz/_tools.py
# def attach(object: typing.Any, name: str) -> typing.Callable:
#     def decorator(func):
# def mkdirs(filename, *, mode: int = 0o777) -> None:
# def mapping_items(mapping):
# def promote_pathlike(filepath: typing.Union[os.PathLike, str]
#                      ) -> pathlib.Path:
# def promote_pathlike(filepath: None) -> None:
# def promote_pathlike(filepath: typing.Union[os.PathLike, str, None]
#                      ) -> typing.Optional[pathlib.Path]:
# def promote_pathlike(filepath: typing.Union[os.PathLike, str, None]
#                      ) -> typing.Optional[pathlib.Path]:
# def promote_pathlike_directory(directory: typing.Union[os.PathLike, str, None], *,
#                                default: typing.Union[os.PathLike, str, None] = None,
#                                ) -> pathlib.Path:
# def deprecate_positional_args(*,
#                               supported_number: int,
#                               category: typing.Type[Warning] = PendingDeprecationWarning,
#                               stacklevel: int = 1):
#         def nulldecorator(func):
#     def decorator(func):
#         def wrapper(*args, **kwargs):
# 
# Path: graphviz/backend/rendering.py
# def get_format(outfile: pathlib.Path, *, format: typing.Optional[str]) -> str:
# def get_supported_suffixes() -> typing.List[str]:
# def get_supported_formats() -> typing.List[str]:
# def infer_format(outfile: pathlib.Path) -> str:
# def get_outfile(filepath: typing.Union[os.PathLike, str], *,
#                 format: str,
#                 renderer: typing.Optional[str] = None,
#                 formatter: typing.Optional[str] = None) -> pathlib.Path:
# def get_filepath(outfile: typing.Union[os.PathLike, str]) -> pathlib.Path:
# def render(engine: str,
#            format: str,
#            filepath: typing.Union[os.PathLike, str],
#            renderer: typing.Optional[str] = ...,
#            formatter: typing.Optional[str] = ...,
#            quiet: bool = ..., *,
#            outfile: typing.Union[os.PathLike, str, None] = ...,
#            raise_if_result_exists: bool = ...,
#            overwrite_filepath: bool = ...) -> str:
# def render(engine: str,
#            format: typing.Optional[str] = ...,
#            filepath: typing.Union[os.PathLike, str, None] = ...,
#            renderer: typing.Optional[str] = ...,
#            formatter: typing.Optional[str] = ...,
#            quiet: bool = False, *,
#            outfile: typing.Union[os.PathLike, str, None] = ...,
#            raise_if_result_exists: bool = ...,
#            overwrite_filepath: bool = ...) -> str:
# def render(engine: str,
#            format: typing.Optional[str] = ...,
#            filepath: typing.Union[os.PathLike, str, None] = ...,
#            renderer: typing.Optional[str] = ...,
#            formatter: typing.Optional[str] = ...,
#            quiet: bool = False, *,
#            outfile: typing.Union[os.PathLike, str, None] = ...,
#            raise_if_result_exists: bool = ...,
#            overwrite_filepath: bool = ...) -> str:
# def render(engine: str,
#            format: typing.Optional[str] = None,
#            filepath: typing.Union[os.PathLike, str, None] = None,
#            renderer: typing.Optional[str] = None,
#            formatter: typing.Optional[str] = None,
#            quiet: bool = False, *,
#            outfile: typing.Union[os.PathLike, str, None] = None,
#            raise_if_result_exists: bool = False,
#            overwrite_filepath: bool = False) -> str:


# Path: tests/backend/test_rendering.py
import pathlib
import os
import shutil
import subprocess
import pytest
import graphviz
import _common
from graphviz import _tools
from graphviz.backend import rendering

     ('spam.dot', 'plain', 'plain', graphviz.FormatSuffixMismatchWarning,
      r"expected format 'dot' from outfile differs from given format: 'plain'"),
     ('spam', 'svg', 'svg', graphviz.UnknownSuffixWarning,
      r"unknown outfile suffix '' \(expected: '\.svg'\)"),
     ('spam.peng', 'png', 'png', graphviz.UnknownSuffixWarning,
      r"unknown outfile suffix '.peng' \(expected: '\.png'\)"),
     ('spam', 'pdf', 'pdf', graphviz.UnknownSuffixWarning,
      r"unknown outfile suffix '' \(expected: '\.pdf'\)")])
def test_get_format_warns(outfile_name, format, expected_result,
                          expected_warning, match):
    outfile = pathlib.Path(outfile_name)

    with pytest.warns(expected_warning, match=match):
        result = rendering.get_format(outfile, format=format)

    assert result == expected_result


@pytest.mark.parametrize(
    'outfile_name,  expected_exception, match',
    [('spam', graphviz.RequiredArgumentError,
      r"cannot infer rendering format from suffix '' of outfile: 'spam'"),
     ('spam.peng', graphviz.RequiredArgumentError,
      r"cannot infer rendering format from suffix '.peng' of outfile: 'spam.peng'"),
     ('spam.wav', graphviz.RequiredArgumentError,
      r"cannot infer rendering format from suffix '.wav' of outfile: 'spam.wav'")])
def test_get_format_raises(outfile_name, expected_exception, match):
    outfile = pathlib.Path(outfile_name)

    with pytest.raises(expected_exception, match=match):

        rendering.get_format(outfile, format=None)