Confirm Python 3.12 and fix failing test

Confirmed that all tests pass with a Python 3.12 virtual environment
(and fixes a flaky test)

Author: delfanbaum

jupyter_book_to_htmlbook/file_processing.py

@@ -215,7 +215,7 @@ def process_chapter_soup(
 
     # perform initial swapping and namespace designation
     chapter, bib = get_main_section(base_soup)
-    if bib and not chapter:  # bibs can be their own chapters
+    if bib and not chapter or bib == chapter:  # bibs can be their own chapters
         chapter = bib
         bib = None
 

tests/test_main.py

@@ -150,7 +150,7 @@ def test_missing_files_raises_python_error(self,
         monkeypatch.chdir(tmp_path)  # patch for our build target
         result = runner.invoke(app, [str(test_env), 'build'])
         assert result.exit_code != 0
-        assert type(result.exception) == FileNotFoundError
+        assert type(result.exception) is FileNotFoundError
 
     @pytest.mark.jb
     @pytest.mark.slow