# -*- coding: utf-8 -*-
from __future__ import print_function, unicode_literals

import os

import six

from pelican import readers
from pelican.tests.support import get_settings, unittest
from pelican.utils import SafeDatetime

try:
    from unittest.mock import patch
except ImportError:
    try:
        from mock import patch
    except ImportError:
        patch = False

CUR_DIR = os.path.dirname(__file__)
CONTENT_PATH = os.path.join(CUR_DIR, 'content')


def _path(*args):
    return os.path.join(CONTENT_PATH, *args)


class ReaderTest(unittest.TestCase):

    def read_file(self, path, **kwargs):
        # Isolate from future API changes to readers.read_file
        r = readers.Readers(settings=get_settings(**kwargs))
        return r.read_file(base_path=CONTENT_PATH, path=path)

    def assertDictHasSubset(self, dictionary, subset):
        for key, value in subset.items():
            if key in dictionary:
                real_value = dictionary.get(key)
                self.assertEqual(
                    value,
                    real_value,
                    'Expected %s to have value %s, but was %s' %
                    (key, value, real_value))
            else:
                self.fail(
                    'Expected %s to have value %s, but was not in Dict' %
                    (key, value))


class TestAssertDictHasSubset(ReaderTest):
    def setUp(self):
        self.dictionary = {
            'key-a': 'val-a',
            'key-b': 'val-b'
        }

    def tearDown(self):
        self.dictionary = None

    def test_subset(self):
        self.assertDictHasSubset(self.dictionary, {'key-a': 'val-a'})

    def test_equal(self):
        self.assertDictHasSubset(self.dictionary, self.dictionary)

    def test_fail_not_set(self):
        six.assertRaisesRegex(
            self,
            AssertionError,
            r'Expected.*key-c.*to have value.*val-c.*but was not in Dict',
            self.assertDictHasSubset,
            self.dictionary,
            {'key-c': 'val-c'})

    def test_fail_wrong_val(self):
        six.assertRaisesRegex(
            self,
            AssertionError,
            r'Expected .*key-a.* to have value .*val-b.* but was .*val-a.*',
            self.assertDictHasSubset,
            self.dictionary,
            {'key-a': 'val-b'})


class DefaultReaderTest(ReaderTest):

    def test_readfile_unknown_extension(self):
        with self.assertRaises(TypeError):
            self.read_file(path='article_with_metadata.unknownextension')

    @unittest.skipUnless(patch, 'Needs Mock module')
    def test_find_empty_alt(self):
        with patch('pelican.readers.logger') as log_mock:
            content = ['<img alt="" src="test-image.png" width="300px" />',
                       '<img src="test-image.png"  width="300px" alt="" />']

            for tag in content:
                readers.find_empty_alt(tag, '/test/path')
                log_mock.warning.assert_called_with(
                    u'Empty alt attribute for image %s in %s',
                    u'test-image.png',
                    u'/test/path',
                    extra={'limit_msg':
                           'Other images have empty alt attributes'}
                )


class RstReaderTest(ReaderTest):

    def test_article_with_metadata(self):
        page = self.read_file(path='article_with_metadata.rst')
        expected = {
            'category': 'yeah',
            'author': 'Alexis Métaireau',
            'title': 'This is a super article !',
            'summary': '<p class="first last">Multi-line metadata should be'
                       ' supported\nas well as <strong>inline'
                       ' markup</strong> and stuff to &quot;typogrify'
                       '&quot;...</p>\n',
            'date': SafeDatetime(2010, 12, 2, 10, 14),
            'modified': SafeDatetime(2010, 12, 2, 10, 20),
            'tags': ['foo', 'bar', 'foobar'],
            'custom_field': 'http://notmyidea.org',
        }

        self.assertDictHasSubset(page.metadata, expected)

    def test_article_with_filename_metadata(self):
        page = self.read_file(
            path='2012-11-29_rst_w_filename_meta#foo-bar.rst',
            FILENAME_METADATA=None)
        expected = {
            'category': 'yeah',
            'author': 'Alexis Métaireau',
            'title': 'Rst with filename metadata',
            'reader': 'rst',
        }
        self.assertDictHasSubset(page.metadata, expected)

        page = self.read_file(
            path='2012-11-29_rst_w_filename_meta#foo-bar.rst',
            FILENAME_METADATA=r'(?P<date>\d{4}-\d{2}-\d{2}).*')
        expected = {
            'category': 'yeah',
            'author': 'Alexis Métaireau',
            'title': 'Rst with filename metadata',
            'date': SafeDatetime(2012, 11, 29),
            'reader': 'rst',
        }
        self.assertDictHasSubset(page.metadata, expected)

        page = self.read_file(
            path='2012-11-29_rst_w_filename_meta#foo-bar.rst',
            FILENAME_METADATA=(
                r'(?P<date>\d{4}-\d{2}-\d{2})'
                r'_(?P<Slug>.*)'
                r'#(?P<MyMeta>.*)-(?P<author>.*)'))
        expected = {
            'category': 'yeah',
            'author': 'Alexis Métaireau',
            'title': 'Rst with filename metadata',
            'date': SafeDatetime(2012, 11, 29),
            'slug': 'rst_w_filename_meta',
            'mymeta': 'foo',
            'reader': 'rst',
        }
        self.assertDictHasSubset(page.metadata, expected)

    def test_article_with_optional_filename_metadata(self):
        page = self.read_file(
            path='2012-11-29_rst_w_filename_meta#foo-bar.rst',
            FILENAME_METADATA=r'(?P<date>\d{4}-\d{2}-\d{2})?')
        expected = {
            'date': SafeDatetime(2012, 11, 29),
            'reader': 'rst',
        }
        self.assertDictHasSubset(page.metadata, expected)

        page = self.read_file(
            path='article.rst',
            FILENAME_METADATA=r'(?P<date>\d{4}-\d{2}-\d{2})?')
        expected = {
            'reader': 'rst',
        }
        self.assertDictHasSubset(page.metadata, expected)
        self.assertNotIn('date', page.metadata, 'Date should not be set.')

    def test_article_metadata_key_lowercase(self):
        # Keys of metadata should be lowercase.
        reader = readers.RstReader(settings=get_settings())
        content, metadata = reader.read(
            _path('article_with_uppercase_metadata.rst'))

        self.assertIn('category', metadata, 'Key should be lowercase.')
        self.assertEqual('Yeah', metadata.get('category'),
                         'Value keeps case.')

    def test_article_extra_path_metadata(self):
        input_with_metadata = '2012-11-29_rst_w_filename_meta#foo-bar.rst'
        page_metadata = self.read_file(
            path=input_with_metadata,
            FILENAME_METADATA=(
                r'(?P<date>\d{4}-\d{2}-\d{2})'
                r'_(?P<Slug>.*)'
                r'#(?P<MyMeta>.*)-(?P<author>.*)'
            ),
            EXTRA_PATH_METADATA={
                input_with_metadata: {
                    'key-1a': 'value-1a',
                    'key-1b': 'value-1b'
                }
            }
        )
        expected_metadata = {
            'category': 'yeah',
            'author': 'Alexis Métaireau',
            'title': 'Rst with filename metadata',
            'date': SafeDatetime(2012, 11, 29),
            'slug': 'rst_w_filename_meta',
            'mymeta': 'foo',
            'reader': 'rst',
            'key-1a': 'value-1a',
            'key-1b': 'value-1b'
        }
        self.assertDictHasSubset(page_metadata.metadata, expected_metadata)

        input_file_path_without_metadata = 'article.rst'
        page_without_metadata = self.read_file(
            path=input_file_path_without_metadata,
            EXTRA_PATH_METADATA={
                input_file_path_without_metadata: {
                    'author': 'Charlès Overwrite'
                }
            }
        )
        expected_without_metadata = {
            'category': 'misc',
            'author': 'Charlès Overwrite',
            'title': 'Article title',
            'reader': 'rst',
        }
        self.assertDictHasSubset(
            page_without_metadata.metadata,
            expected_without_metadata)

    def test_article_extra_path_metadata_dont_overwrite(self):
        # EXTRA_PATH_METADATA['author'] should get ignored
        # since we don't overwrite already set values
        input_file_path = '2012-11-29_rst_w_filename_meta#foo-bar.rst'
        page = self.read_file(
            path=input_file_path,
            FILENAME_METADATA=(
                r'(?P<date>\d{4}-\d{2}-\d{2})'
                r'_(?P<Slug>.*)'
                r'#(?P<MyMeta>.*)-(?P<orginalauthor>.*)'
            ),
            EXTRA_PATH_METADATA={
                input_file_path: {
                    'author': 'Charlès Overwrite',
                    'key-1b': 'value-1b'
                }
            }
        )
        expected = {
            'category': 'yeah',
            'author': 'Alexis Métaireau',
            'title': 'Rst with filename metadata',
            'date': SafeDatetime(2012, 11, 29),
            'slug': 'rst_w_filename_meta',
            'mymeta': 'foo',
            'reader': 'rst',
            'key-1b': 'value-1b'
        }
        self.assertDictHasSubset(page.metadata, expected)

    def test_article_extra_path_metadata_recurse(self):
        parent = "TestCategory"
        notparent = "TestCategory/article"
        path = "TestCategory/article_without_category.rst"

        epm = {
            parent: {'epmr_inherit': parent,
                     'epmr_override': parent, },
            notparent: {'epmr_bogus': notparent},
            path:   {'epmr_override': path, },
            }
        expected_metadata = {
            'epmr_inherit': parent,
            'epmr_override': path,
            }

        page = self.read_file(path=path, EXTRA_PATH_METADATA=epm)
        self.assertDictHasSubset(page.metadata, expected_metadata)

        # Make sure vars aren't getting "inherited" by mistake...
        path = "article.rst"
        page = self.read_file(path=path, EXTRA_PATH_METADATA=epm)
        for k in expected_metadata.keys():
            self.assertNotIn(k, page.metadata)

        # Same, but for edge cases where one file's name is a prefix of
        # another.
        path = "TestCategory/article_without_category.rst"
        page = self.read_file(path=path, EXTRA_PATH_METADATA=epm)
        for k in epm[notparent].keys():
            self.assertNotIn(k, page.metadata)

    def test_typogrify(self):
        # if nothing is specified in the settings, the content should be
        # unmodified
        page = self.read_file(path='article.rst')
        expected = ('<p>THIS is some content. With some stuff to '
                    '&quot;typogrify&quot;...</p>\n<p>Now with added '
                    'support for <abbr title="three letter acronym">'
                    'TLA</abbr>.</p>\n')

        self.assertEqual(page.content, expected)

        try:
            # otherwise, typogrify should be applied
            page = self.read_file(path='article.rst', TYPOGRIFY=True)
            expected = (
                '<p><span class="caps">THIS</span> is some content. '
                'With some stuff to&nbsp;&#8220;typogrify&#8221;&#8230;</p>\n'
                '<p>Now with added support for <abbr title="three letter '
                'acronym"><span class="caps">TLA</span></abbr>.</p>\n')

            self.assertEqual(page.content, expected)
        except ImportError:
            return unittest.skip('need the typogrify distribution')

    def test_typogrify_summary(self):
        # if nothing is specified in the settings, the summary should be
        # unmodified
        page = self.read_file(path='article_with_metadata.rst')
        expected = ('<p class="first last">Multi-line metadata should be'
                    ' supported\nas well as <strong>inline'
                    ' markup</strong> and stuff to &quot;typogrify'
                    '&quot;...</p>\n')

        self.assertEqual(page.metadata['summary'], expected)

        try:
            # otherwise, typogrify should be applied
            page = self.read_file(path='article_with_metadata.rst',
                                  TYPOGRIFY=True)
            expected = ('<p class="first last">Multi-line metadata should be'
                        ' supported\nas well as <strong>inline'
                        ' markup</strong> and stuff to&nbsp;&#8220;typogrify'
                        '&#8221;&#8230;</p>\n')

            self.assertEqual(page.metadata['summary'], expected)
        except ImportError:
            return unittest.skip('need the typogrify distribution')

    def test_typogrify_ignore_tags(self):
        try:
            # typogrify should be able to ignore user specified tags,
            # but tries to be clever with widont extension
            page = self.read_file(path='article.rst', TYPOGRIFY=True,
                                  TYPOGRIFY_IGNORE_TAGS=['p'])
            expected = ('<p>THIS is some content. With some stuff to&nbsp;'
                        '&quot;typogrify&quot;...</p>\n<p>Now with added '
                        'support for <abbr title="three letter acronym">'
                        'TLA</abbr>.</p>\n')

            self.assertEqual(page.content, expected)

            # typogrify should ignore code blocks by default because
            # code blocks are composed inside the pre tag
            page = self.read_file(path='article_with_code_block.rst',
                                  TYPOGRIFY=True)

            expected = ('<p>An article with some&nbsp;code</p>\n'
                        '<div class="highlight"><pre><span></span>'
                        '<span class="n">x</span>'
                        ' <span class="o">&amp;</span>'
                        ' <span class="n">y</span>\n</pre></div>\n'
                        '<p>A block&nbsp;quote:</p>\n<blockquote>\nx '
                        '<span class="amp">&amp;</span> y</blockquote>\n'
                        '<p>Normal:\nx'
                        ' <span class="amp">&amp;</span>'
                        '&nbsp;y'
                        '</p>\n')

            self.assertEqual(page.content, expected)

            # instruct typogrify to also ignore blockquotes
            page = self.read_file(path='article_with_code_block.rst',
                                  TYPOGRIFY=True,
                                  TYPOGRIFY_IGNORE_TAGS=['blockquote'])

            expected = ('<p>An article with some&nbsp;code</p>\n'
                        '<div class="highlight"><pre><span>'
                        '</span><span class="n">x</span>'
                        ' <span class="o">&amp;</span>'
                        ' <span class="n">y</span>\n</pre></div>\n'
                        '<p>A block&nbsp;quote:</p>\n<blockquote>\nx '
                        '&amp; y</blockquote>\n'
                        '<p>Normal:\nx'
                        ' <span class="amp">&amp;</span>'
                        '&nbsp;y'
                        '</p>\n')

            self.assertEqual(page.content, expected)
        except ImportError:
            return unittest.skip('need the typogrify distribution')
        except TypeError:
            return unittest.skip('need typogrify version 2.0.4 or later')

    def test_article_with_multiple_authors(self):
        page = self.read_file(path='article_with_multiple_authors.rst')
        expected = {
            'authors': ['First Author', 'Second Author']
        }

        self.assertDictHasSubset(page.metadata, expected)

    def test_article_with_multiple_authors_semicolon(self):
        page = self.read_file(
            path='article_with_multiple_authors_semicolon.rst')
        expected = {
            'authors': ['Author, First', 'Author, Second']
        }

        self.assertDictHasSubset(page.metadata, expected)

    def test_article_with_multiple_authors_list(self):
        page = self.read_file(path='article_with_multiple_authors_list.rst')
        expected = {
            'authors': ['Author, First', 'Author, Second']
        }

        self.assertDictHasSubset(page.metadata, expected)

    def test_default_date_formats(self):
        tuple_date = self.read_file(path='article.rst',
                                    DEFAULT_DATE=(2012, 5, 1))
        string_date = self.read_file(path='article.rst',
                                     DEFAULT_DATE='2012-05-01')

        self.assertEqual(tuple_date.metadata['date'],
                         string_date.metadata['date'])

    def test_parse_error(self):
        # Verify that it raises an Exception, not nothing and not SystemExit or
        # some such
        with six.assertRaisesRegex(self, Exception, "underline too short"):
            self.read_file(path='../parse_error/parse_error.rst')


@unittest.skipUnless(readers.Markdown, "markdown isn't installed")
class MdReaderTest(ReaderTest):

    def test_article_with_metadata(self):
        reader = readers.MarkdownReader(settings=get_settings())
        content, metadata = reader.read(
            _path('article_with_md_extension.md'))
        expected = {
            'category': 'test',
            'title': 'Test md File',
            'summary': '<p>I have a lot to test</p>',
            'date': SafeDatetime(2010, 12, 2, 10, 14),
            'modified': SafeDatetime(2010, 12, 2, 10, 20),
            'tags': ['foo', 'bar', 'foobar'],
        }
        self.assertDictHasSubset(metadata, expected)

        content, metadata = reader.read(
            _path('article_with_markdown_and_nonascii_summary.md'))
        expected = {
            'title': 'マックOS X 10.8でパイソンとVirtualenvをインストールと設定',
            'summary': '<p>パイソンとVirtualenvをまっくでインストールする方法について明確に説明します。</p>',
            'category': '指導書',
            'date': SafeDatetime(2012, 12, 20),
            'modified': SafeDatetime(2012, 12, 22),
            'tags': ['パイソン', 'マック'],
            'slug': 'python-virtualenv-on-mac-osx-mountain-lion-10.8',
        }
        self.assertDictHasSubset(metadata, expected)

    def test_article_with_footnote(self):
        settings = get_settings()
        ec = settings['MARKDOWN']['extension_configs']
        ec['markdown.extensions.footnotes'] = {'SEPARATOR': '-'}
        reader = readers.MarkdownReader(settings)
        content, metadata = reader.read(
            _path('article_with_markdown_and_footnote.md'))
        expected_content = (
            '<p>This is some content'
            '<sup id="fnref-1"><a class="footnote-ref" href="#fn-1"'
            '>1</a></sup>'
            ' with some footnotes'
            '<sup id="fnref-footnote"><a class="footnote-ref" '
            'href="#fn-footnote">2</a></sup></p>\n'

            '<div class="footnote">\n'
            '<hr>\n<ol>\n<li id="fn-1">\n'
            '<p>Numbered footnote&#160;'
            '<a class="footnote-backref" href="#fnref-1" '
            'title="Jump back to footnote 1 in the text">&#8617;</a></p>\n'
            '</li>\n<li id="fn-footnote">\n'
            '<p>Named footnote&#160;'
            '<a class="footnote-backref" href="#fnref-footnote"'
            ' title="Jump back to footnote 2 in the text">&#8617;</a></p>\n'
            '</li>\n</ol>\n</div>')
        expected_metadata = {
            'title': 'Article with markdown containing footnotes',
            'summary': (
                '<p>Summary with <strong>inline</strong> markup '
                '<em>should</em> be supported.</p>'),
            'date': SafeDatetime(2012, 10, 31),
            'modified': SafeDatetime(2012, 11, 1),
            'multiline': [
                'Line Metadata should be handle properly.',
                'See syntax of Meta-Data extension of '
                'Python Markdown package:',
                'If a line is indented by 4 or more spaces,',
                'that line is assumed to be an additional line of the value',
                'for the previous keyword.',
                'A keyword may have as many lines as desired.',
            ]
        }
        self.assertEqual(content, expected_content)
        self.assertDictHasSubset(metadata, expected_metadata)

    def test_article_with_file_extensions(self):
        reader = readers.MarkdownReader(settings=get_settings())
        # test to ensure the md file extension is being processed by the
        # correct reader
        content, metadata = reader.read(
            _path('article_with_md_extension.md'))
        expected = (
            "<h1>Test Markdown File Header</h1>\n"
            "<h2>Used for pelican test</h2>\n"
            "<p>The quick brown fox jumped over the lazy dog's back.</p>")
        self.assertEqual(content, expected)
        # test to ensure the mkd file extension is being processed by the
        # correct reader
        content, metadata = reader.read(
            _path('article_with_mkd_extension.mkd'))
        expected = ("<h1>Test Markdown File Header</h1>\n<h2>Used for pelican"
                    " test</h2>\n<p>This is another markdown test file.  Uses"
                    " the mkd extension.</p>")
        self.assertEqual(content, expected)
        # test to ensure the markdown file extension is being processed by the
        # correct reader
        content, metadata = reader.read(
            _path('article_with_markdown_extension.markdown'))
        expected = ("<h1>Test Markdown File Header</h1>\n<h2>Used for pelican"
                    " test</h2>\n<p>This is another markdown test file.  Uses"
                    " the markdown extension.</p>")
        self.assertEqual(content, expected)
        # test to ensure the mdown file extension is being processed by the
        # correct reader
        content, metadata = reader.read(
            _path('article_with_mdown_extension.mdown'))
        expected = ("<h1>Test Markdown File Header</h1>\n<h2>Used for pelican"
                    " test</h2>\n<p>This is another markdown test file.  Uses"
                    " the mdown extension.</p>")
        self.assertEqual(content, expected)

    def test_article_with_markdown_markup_extension(self):
        # test to ensure the markdown markup extension is being processed as
        # expected
        page = self.read_file(
            path='article_with_markdown_markup_extensions.md',
            MARKDOWN={
                'extension_configs': {
                    'markdown.extensions.toc': {},
                    'markdown.extensions.codehilite': {},
                    'markdown.extensions.extra': {}
                }
            }
        )
        expected = ('<div class="toc">\n'
                    '<ul>\n'
                    '<li><a href="#level1">Level1</a><ul>\n'
                    '<li><a href="#level2">Level2</a></li>\n'
                    '</ul>\n'
                    '</li>\n'
                    '</ul>\n'
                    '</div>\n'
                    '<h2 id="level1">Level1</h2>\n'
                    '<h3 id="level2">Level2</h3>')

        self.assertEqual(page.content, expected)

    def test_article_with_filename_metadata(self):
        page = self.read_file(
            path='2012-11-30_md_w_filename_meta#foo-bar.md',
            FILENAME_METADATA=None)
        expected = {
            'category': 'yeah',
            'author': 'Alexis Métaireau',
        }
        self.assertDictHasSubset(page.metadata, expected)

        page = self.read_file(
            path='2012-11-30_md_w_filename_meta#foo-bar.md',
            FILENAME_METADATA=r'(?P<date>\d{4}-\d{2}-\d{2}).*')
        expected = {
            'category': 'yeah',
            'author': 'Alexis Métaireau',
            'date': SafeDatetime(2012, 11, 30),
        }
        self.assertDictHasSubset(page.metadata, expected)

        page = self.read_file(
            path='2012-11-30_md_w_filename_meta#foo-bar.md',
            FILENAME_METADATA=(
                r'(?P<date>\d{4}-\d{2}-\d{2})'
                r'_(?P<Slug>.*)'
                r'#(?P<MyMeta>.*)-(?P<author>.*)'))
        expected = {
            'category': 'yeah',
            'author': 'Alexis Métaireau',
            'date': SafeDatetime(2012, 11, 30),
            'slug': 'md_w_filename_meta',
            'mymeta': 'foo',
        }
        self.assertDictHasSubset(page.metadata, expected)

    def test_article_with_optional_filename_metadata(self):
        page = self.read_file(
            path='2012-11-30_md_w_filename_meta#foo-bar.md',
            FILENAME_METADATA=r'(?P<date>\d{4}-\d{2}-\d{2})?')
        expected = {
            'date': SafeDatetime(2012, 11, 30),
            'reader': 'markdown',
        }
        self.assertDictHasSubset(page.metadata, expected)

        page = self.read_file(
            path='empty.md',
            FILENAME_METADATA=r'(?P<date>\d{4}-\d{2}-\d{2})?')
        expected = {
            'reader': 'markdown',
        }
        self.assertDictHasSubset(page.metadata, expected)
        self.assertNotIn('date', page.metadata, 'Date should not be set.')

    def test_duplicate_tags_or_authors_are_removed(self):
        reader = readers.MarkdownReader(settings=get_settings())
        content, metadata = reader.read(
            _path('article_with_duplicate_tags_authors.md'))
        expected = {
            'tags': ['foo', 'bar', 'foobar'],
            'authors': ['Author, First', 'Author, Second'],
        }
        self.assertDictHasSubset(metadata, expected)

    def test_empty_file(self):
        reader = readers.MarkdownReader(settings=get_settings())
        content, metadata = reader.read(
            _path('empty.md'))

        self.assertEqual(metadata, {})
        self.assertEqual(content, '')

    def test_empty_file_with_bom(self):
        reader = readers.MarkdownReader(settings=get_settings())
        content, metadata = reader.read(
            _path('empty_with_bom.md'))

        self.assertEqual(metadata, {})
        self.assertEqual(content, '')


class HTMLReaderTest(ReaderTest):
    def test_article_with_comments(self):
        page = self.read_file(path='article_with_comments.html')

        self.assertEqual('''
        Body content
        <!--  This comment is included (including extra whitespace)   -->
    ''', page.content)

    def test_article_with_keywords(self):
        page = self.read_file(path='article_with_keywords.html')
        expected = {
            'tags': ['foo', 'bar', 'foobar'],
        }

        self.assertDictHasSubset(page.metadata, expected)

    def test_article_with_metadata(self):
        page = self.read_file(path='article_with_metadata.html')
        expected = {
            'category': 'yeah',
            'author': 'Alexis Métaireau',
            'title': 'This is a super article !',
            'summary': 'Summary and stuff',
            'date': SafeDatetime(2010, 12, 2, 10, 14),
            'tags': ['foo', 'bar', 'foobar'],
            'custom_field': 'http://notmyidea.org',
        }

        self.assertDictHasSubset(page.metadata, expected)

    def test_article_with_multiple_similar_metadata_tags(self):
        page = self.read_file(path='article_with_multiple_metadata_tags.html')
        expected = {
            'custom_field': ['https://getpelican.com', 'https://www.eff.org'],
        }

        self.assertDictHasSubset(page.metadata, expected)

    def test_article_with_multiple_authors(self):
        page = self.read_file(path='article_with_multiple_authors.html')
        expected = {
            'authors': ['First Author', 'Second Author']
        }

        self.assertDictHasSubset(page.metadata, expected)

    def test_article_with_metadata_and_contents_attrib(self):
        page = self.read_file(path='article_with_metadata_and_contents.html')
        expected = {
            'category': 'yeah',
            'author': 'Alexis Métaireau',
            'title': 'This is a super article !',
            'summary': 'Summary and stuff',
            'date': SafeDatetime(2010, 12, 2, 10, 14),
            'tags': ['foo', 'bar', 'foobar'],
            'custom_field': 'http://notmyidea.org',
        }
        self.assertDictHasSubset(page.metadata, expected)

    def test_article_with_null_attributes(self):
        page = self.read_file(path='article_with_null_attributes.html')

        self.assertEqual('''
        Ensure that empty attributes are copied properly.
        <input name="test" disabled style="" />
    ''', page.content)

    def test_article_with_attributes_containing_double_quotes(self):
        page = self.read_file(path='article_with_attributes_containing_' +
                                   'double_quotes.html')
        self.assertEqual('''
        Ensure that if an attribute value contains a double quote, it is
        surrounded with single quotes, otherwise with double quotes.
        <span data-test="'single quoted string'">Span content</span>
        <span data-test='"double quoted string"'>Span content</span>
        <span data-test="string without quotes">Span content</span>
    ''', page.content)

    def test_article_metadata_key_lowercase(self):
        # Keys of metadata should be lowercase.
        page = self.read_file(path='article_with_uppercase_metadata.html')

        # Key should be lowercase
        self.assertIn('category', page.metadata, 'Key should be lowercase.')

        # Value should keep cases
        self.assertEqual('Yeah', page.metadata.get('category'))

    def test_article_with_nonconformant_meta_tags(self):
        page = self.read_file(path='article_with_nonconformant_meta_tags.html')
        expected = {
            'summary': 'Summary and stuff',
            'title': 'Article with Nonconformant HTML meta tags',
        }

        self.assertDictHasSubset(page.metadata, expected)

    def test_article_with_inline_svg(self):
        page = self.read_file(path='article_with_inline_svg.html')
        expected = {
            'title': 'Article with an inline SVG',
        }
        self.assertDictHasSubset(page.metadata, expected)
