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diff --git a/tests/test_theming.py b/tests/test_theming.py
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+++ b/tests/test_theming.py
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+"""Test the Theme class."""
+
+import os
+
+import alabaster
+import pytest
+
+from sphinx.theming import ThemeError
+
+
+@pytest.mark.sphinx(
+    testroot='theming',
+    confoverrides={'html_theme': 'ziptheme',
+                   'html_theme_options.testopt': 'foo'})
+def test_theme_api(app, status, warning):
+    cfg = app.config
+
+    themes = ['basic', 'default', 'scrolls', 'agogo', 'sphinxdoc', 'haiku',
+              'traditional', 'epub', 'nature', 'pyramid', 'bizstyle', 'classic', 'nonav',
+              'test-theme', 'ziptheme', 'staticfiles', 'parent', 'child']
+    if alabaster.version.__version_info__ >= (0, 7, 11):
+        themes.append('alabaster')
+
+    # test Theme class API
+    assert set(app.registry.html_themes.keys()) == set(themes)
+    assert app.registry.html_themes['test-theme'] == app.srcdir / 'test_theme' / 'test-theme'
+    assert app.registry.html_themes['ziptheme'] == app.srcdir / 'ziptheme.zip'
+    assert app.registry.html_themes['staticfiles'] == app.srcdir / 'test_theme' / 'staticfiles'
+
+    # test Theme instance API
+    theme = app.builder.theme
+    assert theme.name == 'ziptheme'
+    themedir = theme.themedir
+    assert theme.base.name == 'basic'
+    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.keys()
+
+    options = theme.get_options(cfg.html_theme_options)
+    assert options['testopt'] == 'foo'
+    assert options['nosidebar'] == 'false'
+
+    # cleanup temp directories
+    theme.cleanup()
+    assert not os.path.exists(themedir)
+
+
+@pytest.mark.sphinx(testroot='tocdepth')  # a minimal root
+def test_js_source(app, status, warning):
+    # Now sphinx provides non-minified JS files for jquery.js and underscore.js
+    # to clarify the source of the minified files. see also #1434.
+    # If you update the version of the JS file, please update the source of the
+    # JS file and version number in this test.
+
+    app.builder.build(['contents'])
+
+    v = '3.6.0'
+    msg = 'jquery.js version does not match to {v}'.format(v=v)
+    jquery_min = (app.outdir / '_static' / 'jquery.js').read_text(encoding='utf8')
+    assert 'jQuery v{v}'.format(v=v) in jquery_min, msg
+    jquery_src = (app.outdir / '_static' / 'jquery-{v}.js'.format(v=v)).read_text(encoding='utf8')
+    assert 'jQuery JavaScript Library v{v}'.format(v=v) in jquery_src, msg
+
+    v = '1.13.1'
+    msg = 'underscore.js version does not match to {v}'.format(v=v)
+    underscore_min = (app.outdir / '_static' / 'underscore.js').read_text(encoding='utf8')
+    assert 'Underscore.js {v}'.format(v=v) in underscore_min, msg
+    underscore_src = (app.outdir / '_static' / 'underscore-{v}.js'.format(v=v)).read_text(encoding='utf8')
+    assert 'Underscore.js {v}'.format(v=v) in underscore_src, msg
+
+
+@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, status, warning):
+    style = app.builder.dark_highlighter.formatter_args.get('style')
+    assert style.__name__ == 'MonokaiStyle'
+
+    app.build()
+    assert (app.outdir / '_static' / 'pygments_dark.css').exists()
+
+    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