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diff --git a/tests/test_syntax/extensions/test_legacy_attrs.py b/tests/test_syntax/extensions/test_legacy_attrs.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 TestCase
+
+
+class TestLegacyAtrributes(TestCase):
+
+    maxDiff = None
+
+    def testLegacyAttrs(self):
+        self.assertMarkdownRenders(
+            self.dedent("""
+                # Header {@id=inthebeginning}
+
+                Now, let's try something *inline{@class=special}*, to see if it works
+
+                @id=TABLE.OF.CONTENTS}
+
+
+                * {@id=TABLEOFCONTENTS}
+
+
+                Or in the middle of the text {@id=TABLEOFCONTENTS}
+
+                {@id=tableofcontents}
+
+                [![{@style=float: left; margin: 10px; border:
+                none;}](http://fourthought.com/images/ftlogo.png "Fourthought
+                logo")](http://fourthought.com/)
+
+                ![img{@id=foo}][img]
+
+                [img]: http://example.com/i.jpg
+            """),
+            self.dedent("""
+                <h1 id="inthebeginning">Header </h1>
+                <p>Now, let's try something <em class="special">inline</em>, to see if it works</p>
+                <p>@id=TABLE.OF.CONTENTS}</p>
+                <ul>
+                <li id="TABLEOFCONTENTS"></li>
+                </ul>
+                <p id="TABLEOFCONTENTS">Or in the middle of the text </p>
+                <p id="tableofcontents"></p>
+                <p><a href="http://fourthought.com/"><img alt="" src="http://fourthought.com/images/ftlogo.png" style="float: left; margin: 10px; border: none;" title="Fourthought logo" /></a></p>
+                <p><img alt="img" id="foo" src="http://example.com/i.jpg" /></p>
+            """),  # noqa: E501
+            extensions=['legacy_attrs']
+        )