add cache tests and add cache dedup

mangadlp/cache.py

@@ -44,8 +44,10 @@ class CacheDB:
     def add_chapter(self, chapter: str) -> None:
         log.info(f"Adding chapter to cache-db: {chapter}")
         self.db_uuid_chapters.append(chapter)
+        # dedup entries
+        updated_chapters = list({*self.db_uuid_chapters})
         try:
-            self.db_data[self.db_key]["chapters"] = self.db_uuid_chapters
+            self.db_data[self.db_key]["chapters"] = sorted(updated_chapters)
             self.db_path.write_text(json.dumps(self.db_data, indent=4), encoding="utf8")
         except Exception as exc:
             log.error("Can't write cache-db")

tests/test_06_cache.py

@@ -0,0 +1,77 @@
+import json
+from pathlib import Path
+
+from mangadlp.cache import CacheDB
+
+
+def test_cache_creation():
+    cache_file = Path("cache.json")
+    cache = CacheDB(cache_file, "abc", "en")
+
+    assert cache_file.exists() and cache_file.read_text(encoding="utf8") == "{}"
+    cache_file.unlink()
+
+
+def test_cache_insert():
+    cache_file = Path("cache.json")
+    cache = CacheDB(cache_file, "abc", "en")
+    cache.add_chapter("1")
+    cache.add_chapter("2")
+
+    cache_data = json.loads(cache_file.read_text(encoding="utf8"))
+
+    assert cache_data["abc__en"]["chapters"] == ["1", "2"]
+    cache_file.unlink()
+
+
+def test_cache_update():
+    cache_file = Path("cache.json")
+    cache = CacheDB(cache_file, "abc", "en")
+    cache.add_chapter("1")
+    cache.add_chapter("2")
+
+    cache_data = json.loads(cache_file.read_text(encoding="utf8"))
+    assert cache_data["abc__en"]["chapters"] == ["1", "2"]
+
+    cache.add_chapter("3")
+
+    cache_data = json.loads(cache_file.read_text(encoding="utf8"))
+    assert cache_data["abc__en"]["chapters"] == ["1", "2", "3"]
+
+    cache_file.unlink()
+
+
+def test_cache_multiple():
+    cache_file = Path("cache.json")
+    cache1 = CacheDB(cache_file, "abc", "en")
+    cache1.add_chapter("1")
+    cache1.add_chapter("2")
+
+    cache2 = CacheDB(cache_file, "def", "en")
+    cache2.add_chapter("8")
+    cache2.add_chapter("9")
+
+    cache_data = json.loads(cache_file.read_text(encoding="utf8"))
+
+    assert cache_data["abc__en"]["chapters"] == ["1", "2"]
+    assert cache_data["def__en"]["chapters"] == ["8", "9"]
+
+    cache_file.unlink()
+
+
+def test_cache_lang():
+    cache_file = Path("cache.json")
+    cache1 = CacheDB(cache_file, "abc", "en")
+    cache1.add_chapter("1")
+    cache1.add_chapter("2")
+
+    cache2 = CacheDB(cache_file, "abc", "de")
+    cache2.add_chapter("8")
+    cache2.add_chapter("9")
+
+    cache_data = json.loads(cache_file.read_text(encoding="utf8"))
+
+    assert cache_data["abc__en"]["chapters"] == ["1", "2"]
+    assert cache_data["abc__de"]["chapters"] == ["8", "9"]
+
+    cache_file.unlink()