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test_tools.py
# Python Markdown # A Python implementation of John Gruber's Markdown. # Documentation: https://python-markdown.github.io/ # GitHub: https://github.com/Python-Markdown/markdown/ # PyPI: https://pypi.org/project/Markdown/ # Started by Manfred Stienstra (http://www.dwerg.net/). # Maintained for a few years by Yuri Takhteyev (http://www.freewisdom.org). # Currently maintained by Waylan Limberg (https://github.com/waylan), # Dmitry Shachnev (https://github.com/mitya57) and Isaac Muse (https://github.com/facelessuser). # Copyright 2007-2023 The Python Markdown Project (v. 1.7 and later) # Copyright 2004, 2005, 2006 Yuri Takhteyev (v. 0.2-1.6b) # Copyright 2004 Manfred Stienstra (the original version) # License: BSD (see LICENSE.md for details). """ A collection of tools for testing the Markdown code base and extensions. """ from __future__ import annotations import os import sys import unittest import textwrap from typing import Any from . import markdown, Markdown, util try: import tidylib except ImportError: tidylib = None __all__ = ['TestCase', 'LegacyTestCase', 'Kwargs'] class TestCase(unittest.TestCase): """ A [`unittest.TestCase`][] subclass with helpers for testing Markdown output. Define `default_kwargs` as a `dict` of keywords to pass to Markdown for each test. The defaults can be overridden on individual tests. The `assertMarkdownRenders` method accepts the source text, the expected output, and any keywords to pass to Markdown. The `default_kwargs` are used except where overridden by `kwargs`. The output and expected output are passed to `TestCase.assertMultiLineEqual`. An `AssertionError` is raised with a diff if the actual output does not equal the expected output. The `dedent` method is available to dedent triple-quoted strings if necessary. In all other respects, behaves as `unittest.TestCase`. """ default_kwargs: dict[str, Any] = {} """ Default options to pass to Markdown for each test. """ def assertMarkdownRenders(self, source, expected, expected_attrs=None, **kwargs): """ Test that source Markdown text renders to expected output with given keywords. `expected_attrs` accepts a `dict`. Each key should be the name of an attribute on the `Markdown` instance and the value should be the expected value after the source text is parsed by Markdown. After the expected output is tested, the expected value for each attribute is compared against the actual attribute of the `Markdown` instance using `TestCase.assertEqual`. """ expected_attrs = expected_attrs or {} kws = self.default_kwargs.copy() kws.update(kwargs) md = Markdown(**kws) output = md.convert(source) self.assertMultiLineEqual(output, expected) for key, value in expected_attrs.items(): self.assertEqual(getattr(md, key), value) def dedent(self, text): """ Dedent text. """ # TODO: If/when actual output ends with a newline, then use: # return textwrap.dedent(text.strip('/n')) return textwrap.dedent(text).strip() class recursionlimit: """ A context manager which temporarily modifies the Python recursion limit. The testing framework, coverage, etc. may add an arbitrary number of levels to the depth. To maintain consistency in the tests, the current stack depth is determined when called, then added to the provided limit. Example usage: ``` python with recursionlimit(20): # test code here ``` See <https://stackoverflow.com/a/50120316/866026>. """ def __init__(self, limit): self.limit = util._get_stack_depth() + limit self.old_limit = sys.getrecursionlimit() def __enter__(self): sys.setrecursionlimit(self.limit) def __exit__(self, type, value, tb): sys.setrecursionlimit(self.old_limit) ######################### # Legacy Test Framework # ######################### class Kwargs(dict): """ A `dict` like class for holding keyword arguments. """ pass def _normalize_whitespace(text): """ Normalize whitespace for a string of HTML using `tidylib`. """ output, errors = tidylib.tidy_fragment(text, options={ 'drop_empty_paras': 0, 'fix_backslash': 0, 'fix_bad_comments': 0, 'fix_uri': 0, 'join_styles': 0, 'lower_literals': 0, 'merge_divs': 0, 'output_xhtml': 1, 'quote_ampersand': 0, 'newline': 'LF' }) return output class LegacyTestMeta(type): def __new__(cls, name, bases, dct): def generate_test(infile, outfile, normalize, kwargs): def test(self): with open(infile, encoding="utf-8") as f: input = f.read() with open(outfile, encoding="utf-8") as f: # Normalize line endings # (on Windows, git may have altered line endings). expected = f.read().replace("\r\n", "\n") output = markdown(input, **kwargs) if tidylib and normalize: try: expected = _normalize_whitespace(expected) output = _normalize_whitespace(output) except OSError: self.skipTest("Tidylib's c library not available.") elif normalize: self.skipTest('Tidylib not available.') self.assertMultiLineEqual(output, expected) return test location = dct.get('location', '') exclude = dct.get('exclude', []) normalize = dct.get('normalize', False) input_ext = dct.get('input_ext', '.txt') output_ext = dct.get('output_ext', '.html') kwargs = dct.get('default_kwargs', Kwargs()) if os.path.isdir(location): for file in os.listdir(location): infile = os.path.join(location, file) if os.path.isfile(infile): tname, ext = os.path.splitext(file) if ext == input_ext: outfile = os.path.join(location, tname + output_ext) tname = tname.replace(' ', '_').replace('-', '_') kws = kwargs.copy() if tname in dct: kws.update(dct[tname]) test_name = 'test_%s' % tname if tname not in exclude: dct[test_name] = generate_test(infile, outfile, normalize, kws) else: dct[test_name] = unittest.skip('Excluded')(lambda: None) return type.__new__(cls, name, bases, dct) class LegacyTestCase(unittest.TestCase, metaclass=LegacyTestMeta): """ A [`unittest.TestCase`][] subclass for running Markdown's legacy file-based tests. A subclass should define various properties which point to a directory of text-based test files and define various behaviors/defaults for those tests. The following properties are supported: Attributes: location (str): A path to the directory of test files. An absolute path is preferred. exclude (list[str]): A list of tests to exclude. Each test name should comprise the filename without an extension. normalize (bool): A boolean value indicating if the HTML should be normalized. Default: `False`. input_ext (str): A string containing the file extension of input files. Default: `.txt`. output_ext (str): A string containing the file extension of expected output files. Default: `html`. default_kwargs (Kwargs[str, Any]): The default set of keyword arguments for all test files in the directory. In addition, properties can be defined for each individual set of test files within the directory. The property should be given the name of the file without the file extension. Any spaces and dashes in the filename should be replaced with underscores. The value of the property should be a `Kwargs` instance which contains the keyword arguments that should be passed to `Markdown` for that test file. The keyword arguments will "update" the `default_kwargs`. When the class instance is created, it will walk the given directory and create a separate `Unitttest` for each set of test files using the naming scheme: `test_filename`. One `Unittest` will be run for each set of input and output files. """ pass
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