Add unit test for remote logo and fav icon

tests/roots/test-remote-logo/conf.py

@@ -0,0 +1,5 @@
+latex_documents = [
+    ('index', 'test.tex', 'The basic Sphinx documentation for testing', 'Sphinx', 'report')
+]
+html_logo = "https://www.python.org/static/img/python-logo.png"
+html_favicon = "https://www.python.org/static/favicon.ico"

tests/roots/test-remote-logo/index.rst

@@ -0,0 +1,32 @@
+The basic Sphinx documentation for testing
+==========================================
+
+Sphinx is a tool that makes it easy to create intelligent and beautiful
+documentation for Python projects (or other documents consisting of multiple
+reStructuredText sources), written by Georg Brandl.  It was originally created
+for the new Python documentation, and has excellent facilities for Python
+project documentation, but C/C++ is supported as well, and more languages are
+planned.
+
+Sphinx uses reStructuredText as its markup language, and many of its strengths
+come from the power and straightforwardness of reStructuredText and its parsing
+and translating suite, the Docutils.
+
+features
+--------
+
+Among its features are the following:
+
+* Output formats: HTML (including derivative formats such as HTML Help, Epub
+  and Qt Help), plain text, manual pages and LaTeX or direct PDF output
+  using rst2pdf
+* Extensive cross-references: semantic markup and automatic links
+  for functions, classes, glossary terms and similar pieces of information
+* Hierarchical structure: easy definition of a document tree, with automatic
+  links to siblings, parents and children
+* Automatic indices: general index as well as a module index
+* Code handling: automatic highlighting using the Pygments highlighter
+* Flexible HTML output using the Jinja 2 templating engine
+* Various extensions are available, e.g. for automatic testing of snippets
+  and inclusion of appropriately formatted docstrings
+* Setuptools integration

tests/test_build_html.py

@@ -1330,6 +1330,16 @@ def test_html_remote_images(app, status, warning):
     assert not (app.outdir / 'python-logo.png').exists()
 
 
+@pytest.mark.sphinx('html', testroot='remote-logo')
+def test_html_remote_logo(app, status, warning):
+    app.builder.build_all()
+
+    result = (app.outdir / 'index.html').read_text()
+    assert ('<img class="logo" src="https://www.python.org/static/img/python-logo.png" alt="Logo"/>' in result)
+    assert ('<link rel="shortcut icon" href="https://www.python.org/static/favicon.ico"/>' in result)
+    assert not (app.outdir / 'python-logo.png').exists()
+
+
 @pytest.mark.sphinx('html', testroot='basic')
 def test_html_sidebar(app, status, warning):
     ctx = {}