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diff --git a/tests/test_legacy.py b/tests/test_legacy.py
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+"""
+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 2007-2018 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).
+"""
+
+from markdown.test_tools import LegacyTestCase, Kwargs
+import os
+import warnings
+
+# Warnings should cause tests to fail...
+warnings.simplefilter('error')
+# Except for the warnings that shouldn't
+warnings.filterwarnings('default', category=PendingDeprecationWarning)
+warnings.filterwarnings('default', category=DeprecationWarning, module='markdown')
+
+parent_test_dir = os.path.abspath(os.path.dirname(__file__))
+
+
+class TestBasic(LegacyTestCase):
+    location = os.path.join(parent_test_dir, 'basic')
+
+
+class TestMisc(LegacyTestCase):
+    location = os.path.join(parent_test_dir, 'misc')
+
+
+class TestPhp(LegacyTestCase):
+    """
+    Notes on "excluded" tests:
+
+    Quotes in attributes: attributes get output in different order
+
+    Inline HTML (Span): Backtick in raw HTML attribute TODO: fixme
+
+    Backslash escapes: Weird whitespace issue in output
+
+    Ins & del: Our behavior follows markdown.pl I think PHP is wrong here
+
+    Auto Links: TODO: fix raw HTML so is doesn't match <hr@example.com> as a <hr>.
+
+    Empty List Item: We match markdown.pl here. Maybe someday we'll support this
+
+    Headers: TODO: fix headers to not require blank line before
+
+    Mixed OLs and ULs: We match markdown.pl here. I think PHP is wrong here
+
+    Emphasis: We have various minor differences in combined & incorrect em markup.
+    Maybe fix a few of them - but most aren't too important
+
+    Code block in a list item: We match markdown.pl - not sure how php gets that output??
+
+    PHP-Specific Bugs: Not sure what to make of the escaping stuff here.
+    Why is PHP not removing a blackslash?
+    """
+    location = os.path.join(parent_test_dir, 'php')
+    normalize = True
+    input_ext = '.text'
+    output_ext = '.xhtml'
+    exclude = [
+        'Quotes_in_attributes',
+        'Inline_HTML_(Span)',
+        'Backslash_escapes',
+        'Ins_&_del',
+        'Auto_Links',
+        'Empty_List_Item',
+        'Headers',
+        'Mixed_OLs_and_ULs',
+        'Emphasis',
+        'Code_block_in_a_list_item',
+        'PHP_Specific_Bugs'
+    ]
+
+
+# class TestPhpExtra(LegacyTestCase):
+#     location = os.path.join(parent_test_dir, 'php/extra')
+#     normalize = True
+#     input_ext = '.text'
+#     output_ext = '.xhtml'
+#     default_kwargs = Kwargs(extensions=['extra'])
+
+
+class TestPl2004(LegacyTestCase):
+    location = os.path.join(parent_test_dir, 'pl/Tests_2004')
+    normalize = True
+    input_ext = '.text'
+    exclude = ['Yuri_Footnotes', 'Yuri_Attributes']
+
+
+class TestPl2007(LegacyTestCase):
+    """
+    Notes on "excluded" tests:
+
+    Images: the attributes don't get ordered the same so we skip this
+
+    Code Blocks: some weird whitespace issue
+
+    Links, reference style: weird issue with nested brackets TODO: fixme
+
+    Backslash escapes: backticks in raw html attributes TODO: fixme
+
+    Code Spans: more backticks in raw html attributes TODO: fixme
+    """
+    location = os.path.join(parent_test_dir, 'pl/Tests_2007')
+    normalize = True
+    input_ext = '.text'
+    exclude = [
+        'Images',
+        'Code_Blocks',
+        'Links,_reference_style',
+        'Backslash_escapes',
+        'Code_Spans'
+    ]
+
+
+class TestExtensions(LegacyTestCase):
+    location = os.path.join(parent_test_dir, 'extensions')
+    exclude = ['codehilite']
+
+    attr_list = Kwargs(extensions=['attr_list', 'def_list', 'smarty'])
+
+    codehilite = Kwargs(extensions=['codehilite'])
+
+    toc = Kwargs(extensions=['toc'])
+
+    toc_invalid = Kwargs(extensions=['toc'])
+
+    toc_out_of_order = Kwargs(extensions=['toc'])
+
+    toc_nested = Kwargs(
+        extensions=['toc'],
+        extension_configs={'toc': {'permalink': True}}
+    )
+
+    toc_nested2 = Kwargs(
+        extensions=['toc'],
+        extension_configs={'toc': {'permalink': "[link]"}}
+    )
+
+    toc_nested_list = Kwargs(extensions=['toc'])
+
+    wikilinks = Kwargs(extensions=['wikilinks'])
+
+    github_flavored = Kwargs(extensions=['fenced_code'])
+
+    sane_lists = Kwargs(extensions=['sane_lists'])
+
+    nl2br_w_attr_list = Kwargs(extensions=['nl2br', 'attr_list'])
+
+    admonition = Kwargs(extensions=['admonition'])
+
+    smarty = Kwargs(
+        extensions=['smarty'],
+        extension_configs={'smarty': {'smart_angled_quotes': True}}
+    )
+
+
+class TestExtensionsExtra(LegacyTestCase):
+    location = os.path.join(parent_test_dir, 'extensions/extra')
+    default_kwargs = Kwargs(extensions=['extra'])
+
+    loose_def_list = Kwargs(extensions=['def_list'])
+
+    simple_def_lists = Kwargs(extensions=['def_list'])
+
+    abbr = Kwargs(extensions=['abbr'])
+
+    footnotes = Kwargs(extensions=['footnotes'])
+
+    extra_config = Kwargs(
+        extensions=['extra'],
+        extension_configs={
+            'extra': {
+                'footnotes': {
+                    'PLACE_MARKER': '~~~placemarker~~~'
+                }
+            }
+        }
+    )