feat: Enhance speaker analysis with gender inference and update related tests

tests/test_text_extractor.py

@@ -0,0 +1,27 @@
+from pathlib import Path
+
+from abogen.text_extractor import extract_from_path
+from abogen.utils import calculate_text_length
+
+
+ASSET = Path("test_assets/alexandre-dumas_the-count-of-monte-cristo_chapman-and-hall.epub")
+
+
+def test_epub_character_counts_align_with_calculated_total():
+    result = extract_from_path(ASSET)
+
+    combined_total = calculate_text_length(result.combined_text)
+    chapter_total = sum(chapter.characters for chapter in result.chapters)
+
+    assert result.total_characters == combined_total == chapter_total
+
+
+def test_epub_metadata_composer_matches_artist():
+    result = extract_from_path(ASSET)
+
+    composer = result.metadata.get("composer") or result.metadata.get("COMPOSER")
+    artist = result.metadata.get("artist") or result.metadata.get("ARTIST")
+
+    assert composer
+    assert composer == artist
+    assert composer != "Narrator"