def test_heading_not_startig_from_h1_should_mention_reason(self):
html = '''
<h2>two</h2>
<h3>three</h3>
'''
reason = TocGenerator(html).is_invalid()
self.assertIn('<h2>two</h2>', reason.lower())
def test_heading_not_startig_from_h1_should_mention_reason(self):
html = '''
<h2>two</h2>
<h3>three</h3>
'''
reason = TocGenerator(html).is_invalid()
self.assertIn('<h2>two</h2>', reason.lower())
def test_invalid_level_of_headings_should_mention_reason(self):
html = '''
<h1>one</h1>
<h1>two</h1>
<h3>three</h3>
'''
reason = TocGenerator(html).is_invalid()
self.assertIn('<h3>three</h3>', reason.lower())
def test_invalid_level_of_headings_should_mention_reason(self):
html = '''
<h1>one</h1>
<h1>two</h1>
<h3>three</h3>
'''
reason = TocGenerator(html).is_invalid()
self.assertIn('<h3>three</h3>', reason.lower())
