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diff --git a/tests/test_theming/test_theming.py b/tests/test_theming/test_theming.py
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+++ b/tests/test_theming/test_theming.py
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+"""Test the Theme class."""
+
+import os
+import shutil
+from pathlib import Path
+from xml.etree.ElementTree import ParseError
+
+import pytest
+from defusedxml.ElementTree import parse as xml_parse
+
+import sphinx.builders.html
+from sphinx.errors import ThemeError
+from sphinx.theming import (
+    _ConfigFile,
+    _convert_theme_conf,
+    _convert_theme_toml,
+    _load_theme,
+    _load_theme_conf,
+    _load_theme_toml,
+)
+
+HERE = Path(__file__).resolve().parent
+
+
+@pytest.mark.sphinx(
+    testroot='theming',
+    confoverrides={'html_theme': 'ziptheme', 'html_theme_options.testopt': 'foo'},
+)
+def test_theme_api(app, status, warning):
+    themes = [
+        'basic',
+        'default',
+        'scrolls',
+        'agogo',
+        'sphinxdoc',
+        'haiku',
+        'traditional',
+        'epub',
+        'nature',
+        'pyramid',
+        'bizstyle',
+        'classic',
+        'nonav',
+        'test-theme',
+        'ziptheme',
+        'staticfiles',
+        'parent',
+        'child',
+        'alabaster',
+    ]
+
+    # test Theme class API
+    assert set(app.registry.html_themes.keys()) == set(themes)
+    assert app.registry.html_themes['test-theme'] == str(
+        app.srcdir / 'test_theme' / 'test-theme'
+    )
+    assert app.registry.html_themes['ziptheme'] == str(app.srcdir / 'ziptheme.zip')
+    assert app.registry.html_themes['staticfiles'] == str(
+        app.srcdir / 'test_theme' / 'staticfiles'
+    )
+
+    # test Theme instance API
+    theme = app.builder.theme
+    assert theme.name == 'ziptheme'
+    assert len(theme.get_theme_dirs()) == 2
+
+    # direct setting
+    assert theme.get_config('theme', 'stylesheet') == 'custom.css'
+    # inherited setting
+    assert theme.get_config('options', 'nosidebar') == 'false'
+    # nonexisting setting
+    assert theme.get_config('theme', 'foobar', 'def') == 'def'
+    with pytest.raises(ThemeError):
+        theme.get_config('theme', 'foobar')
+
+    # options API
+
+    options = theme.get_options({'nonexisting': 'foo'})
+    assert 'nonexisting' not in options
+
+    options = theme.get_options(app.config.html_theme_options)
+    assert options['testopt'] == 'foo'
+    assert options['nosidebar'] == 'false'
+
+    # cleanup temp directories
+    theme._cleanup()
+    assert not any(map(os.path.exists, theme._tmp_dirs))
+
+
+def test_nonexistent_theme_settings(tmp_path):
+    # Check that error occurs with a non-existent theme.toml or theme.conf
+    # (https://github.com/sphinx-doc/sphinx/issues/11668)
+    with pytest.raises(ThemeError):
+        _load_theme('', str(tmp_path))
+
+
+@pytest.mark.sphinx(testroot='double-inheriting-theme')
+def test_double_inheriting_theme(app, status, warning):
+    assert app.builder.theme.name == 'base_theme2'
+    app.build()  # => not raises TemplateNotFound
+
+
+@pytest.mark.sphinx(testroot='theming', confoverrides={'html_theme': 'child'})
+def test_nested_zipped_theme(app, status, warning):
+    assert app.builder.theme.name == 'child'
+    app.build()  # => not raises TemplateNotFound
+
+
+@pytest.mark.sphinx(testroot='theming', confoverrides={'html_theme': 'staticfiles'})
+def test_staticfiles(app, status, warning):
+    app.build()
+    assert (app.outdir / '_static' / 'staticimg.png').exists()
+    assert (app.outdir / '_static' / 'statictmpl.html').exists()
+    assert (app.outdir / '_static' / 'statictmpl.html').read_text(encoding='utf8') == (
+        '<!-- testing static templates -->\n<html><project>Python</project></html>'
+    )
+
+    result = (app.outdir / 'index.html').read_text(encoding='utf8')
+    assert '<meta name="testopt" content="optdefault" />' in result
+
+
+@pytest.mark.sphinx(testroot='theming', confoverrides={'html_theme': 'test-theme'})
+def test_dark_style(app, monkeypatch):
+    monkeypatch.setattr(sphinx.builders.html, '_file_checksum', lambda o, f: '')
+
+    style = app.builder.dark_highlighter.formatter_args.get('style')
+    assert style.__name__ == 'MonokaiStyle'
+
+    app.build()
+    assert (app.outdir / '_static' / 'pygments_dark.css').exists()
+
+    css_file, properties = app.registry.css_files[0]
+    assert css_file == 'pygments_dark.css'
+    assert 'media' in properties
+    assert properties['media'] == '(prefers-color-scheme: dark)'
+
+    assert sorted(f.filename for f in app.builder._css_files) == [
+        '_static/classic.css',
+        '_static/pygments.css',
+        '_static/pygments_dark.css',
+    ]
+
+    result = (app.outdir / 'index.html').read_text(encoding='utf8')
+    assert '<link rel="stylesheet" type="text/css" href="_static/pygments.css" />' in result
+    assert (
+        '<link id="pygments_dark_css" media="(prefers-color-scheme: dark)" '
+        'rel="stylesheet" type="text/css" '
+        'href="_static/pygments_dark.css" />'
+    ) in result
+
+
+@pytest.mark.sphinx(testroot='theming')
+def test_theme_sidebars(app, status, warning):
+    app.build()
+
+    # test-theme specifies globaltoc and searchbox as default sidebars
+    result = (app.outdir / 'index.html').read_text(encoding='utf8')
+    assert '<h3><a href="#">Table of Contents</a></h3>' in result
+    assert '<h3>Related Topics</h3>' not in result
+    assert '<h3>This Page</h3>' not in result
+    assert '<h3 id="searchlabel">Quick search</h3>' in result
+
+
+@pytest.mark.parametrize(
+    'theme_name',
+    [
+        'alabaster',
+        'agogo',
+        'basic',
+        'bizstyle',
+        'classic',
+        'default',
+        'epub',
+        'haiku',
+        'nature',
+        'nonav',
+        'pyramid',
+        'scrolls',
+        'sphinxdoc',
+        'traditional',
+    ],
+)
+def test_theme_builds(make_app, rootdir, sphinx_test_tempdir, theme_name):
+    """Test all the themes included with Sphinx build a simple project and produce valid XML."""
+    testroot_path = rootdir / 'test-basic'
+    srcdir = sphinx_test_tempdir / f'test-theme-{theme_name}'
+    shutil.copytree(testroot_path, srcdir)
+
+    app = make_app(srcdir=srcdir, confoverrides={'html_theme': theme_name})
+    app.build()
+    assert not app.warning.getvalue().strip()
+    assert app.outdir.joinpath('index.html').exists()
+
+    # check that the generated HTML files are well-formed (as strict XML)
+    for html_file in app.outdir.rglob('*.html'):
+        try:
+            xml_parse(html_file)
+        except ParseError as exc:
+            pytest.fail(f'Failed to parse {html_file.relative_to(app.outdir)}: {exc}')
+
+
+def test_config_file_toml():
+    config_path = HERE / 'theme.toml'
+    cfg = _load_theme_toml(str(config_path))
+    config = _convert_theme_toml(cfg)
+
+    assert config == _ConfigFile(
+        stylesheets=('spam.css', 'ham.css'),
+        sidebar_templates=None,
+        pygments_style_default='spam',
+        pygments_style_dark=None,
+        options={'lobster': 'thermidor'},
+    )
+
+
+def test_config_file_conf():
+    config_path = HERE / 'theme.conf'
+    cfg = _load_theme_conf(str(config_path))
+    config = _convert_theme_conf(cfg)
+
+    assert config == _ConfigFile(
+        stylesheets=('spam.css', 'ham.css'),
+        sidebar_templates=None,
+        pygments_style_default='spam',
+        pygments_style_dark=None,
+        options={'lobster': 'thermidor'},
+    )