diff --git a/contrib/api_template.py b/contrib/api_template.py
index aa95174..89ed331 100644
--- a/contrib/api_template.py
+++ b/contrib/api_template.py
@@ -3,7 +3,8 @@
 
 class YourAPI:
     """Your API Class.
-    Get infos for a manga from example.org
+
+    Get infos for a manga from example.org.
 
     Args:
         url_uuid (str): URL or UUID of the manga
@@ -23,9 +24,7 @@ class YourAPI:
     img_base_url = "https://uploads.mangadex.org"
 
     def __init__(self, url_uuid, language, forcevol):
-        """
-        get infos to initiate class
-        """
+        """get infos to initiate class."""
         self.api_name = "Your API Name"
 
         self.url_uuid = url_uuid
@@ -67,8 +66,7 @@ class YourAPI:
         }
 
         def get_chapter_images(chapter: str, download_wait: float) -> list:
-            """
-            Get chapter images as a list (full links)
+            """Get chapter images as a list (full links).
 
             Args:
                 chapter: The chapter number (chapter data index)
@@ -77,7 +75,6 @@ class YourAPI:
             Returns:
                 The list of urls of the page images
             """
-
             # example
             return [
                 "https://abc.def/image/123.png",
@@ -85,10 +82,10 @@ class YourAPI:
                 "https://abc.def/image/12345.png",
             ]
 
-        def create_metadata(self, chapter: str) -> dict:
-            """
-            Get metadata with correct keys for ComicInfo.xml
-            Provide as much metadata as possible. empty/false values will be ignored
+        def create_metadata(chapter: str) -> dict:
+            """Get metadata with correct keys for ComicInfo.xml.
+
+            Provide as much metadata as possible. empty/false values will be ignored.
 
             Args:
                 chapter: The chapter number (chapter data index)
@@ -96,7 +93,6 @@ class YourAPI:
             Returns:
                 The metadata as a dict
             """
-
             # metadata types. have to be valid
             # {key: (type, default value, valid values)}
             {
diff --git a/mangadlp/api/mangadex.py b/mangadlp/api/mangadex.py
index 12abf93..a6e3f11 100644
--- a/mangadlp/api/mangadex.py
+++ b/mangadlp/api/mangadex.py
@@ -9,7 +9,8 @@ from mangadlp import utils
 
 class Mangadex:
     """Mangadex API Class.
-    Get infos for a manga from mangadex.org
+
+    Get infos for a manga from mangadex.org.
 
     Args:
         url_uuid (str): URL or UUID of the manga
diff --git a/mangadlp/app.py b/mangadlp/app.py
index 1fb58a8..439deb3 100644
--- a/mangadlp/app.py
+++ b/mangadlp/app.py
@@ -14,7 +14,7 @@ from mangadlp.utils import get_file_format
 
 
 def match_api(url_uuid: str) -> type:
-    """Match the correct api class from a string
+    """Match the correct api class from a string.
 
     Args:
         url_uuid: url/uuid to check
@@ -22,7 +22,6 @@ def match_api(url_uuid: str) -> type:
     Returns:
         The class of the API to use
     """
-
     # apis to check
     apis: list[tuple[str, re.Pattern, type]] = [
         (
@@ -53,6 +52,7 @@ def match_api(url_uuid: str) -> type:
 
 class MangaDLP:
     """Download Mangas from supported sites.
+
     After initialization, start the script with the function get_manga().
 
     Args:
diff --git a/mangadlp/cli.py b/mangadlp/cli.py
index b62e1cc..0da36a2 100644
--- a/mangadlp/cli.py
+++ b/mangadlp/cli.py
@@ -228,11 +228,7 @@ def readin_list(_ctx, _param, value) -> list:
 )
 @click.pass_context
 def main(ctx: click.Context, **kwargs) -> None:
-    """
-    Script to download mangas from various sites
-
-    """
-
+    """Script to download mangas from various sites."""
     url_uuid: str = kwargs.pop("url_uuid")
     read_mangas: list[str] = kwargs.pop("read_mangas")
     verbosity: int = kwargs.pop("verbosity")
diff --git a/mangadlp/hooks.py b/mangadlp/hooks.py
index 31c702a..514af64 100644
--- a/mangadlp/hooks.py
+++ b/mangadlp/hooks.py
@@ -5,7 +5,10 @@ from loguru import logger as log
 
 
 def run_hook(command: str, hook_type: str, **kwargs) -> int:
-    """
+    """Run a command.
+
+    Run a command with subprocess.run and add kwargs to the environment.
+
     Args:
         command (str): command to run
         hook_type (str): type of the hook
@@ -14,7 +17,6 @@ def run_hook(command: str, hook_type: str, **kwargs) -> int:
     Returns:
         exit_code (int): exit code of command
     """
-
     # check if hook commands are empty
     if not command or command == "None":
         log.debug(f"Hook '{hook_type}' empty. Not running")
diff --git a/mangadlp/logger.py b/mangadlp/logger.py
index 576baa5..f332ed4 100644
--- a/mangadlp/logger.py
+++ b/mangadlp/logger.py
@@ -8,9 +8,7 @@ LOGURU_FMT = "{time:%Y-%m-%dT%H:%M:%S%z} | <level>[{level: <7}]</level> [{name:
 
 # from loguru docs
 class InterceptHandler(logging.Handler):
-    """
-    Intercept python logging messages and log them via loguru.logger
-    """
+    """Intercept python logging messages and log them via loguru.logger."""
 
     def emit(self, record):
         # Get corresponding Loguru level if it exists
diff --git a/mangadlp/metadata.py b/mangadlp/metadata.py
index 343a3cc..3e31463 100644
--- a/mangadlp/metadata.py
+++ b/mangadlp/metadata.py
@@ -84,7 +84,7 @@ def validate_metadata(metadata_in: dict) -> Dict[str, dict]:
 
         # check if metadata type is correct
         log.debug(f"Key:{key} -> value={type(md_to_check)} -> check={metadata_type}")
-        if not isinstance(md_to_check, metadata_type):  # noqa
+        if not isinstance(md_to_check, metadata_type):
             log.warning(
                 f"Metadata has wrong type: {key}:{metadata_type} -> {md_to_check}"
             )
diff --git a/tests/test_04_input.py b/tests/test_04_input.py
index 093558d..a4e4636 100644
--- a/tests/test_04_input.py
+++ b/tests/test_04_input.py
@@ -16,8 +16,6 @@ def test_read_and_url():
 
 
 def test_no_read_and_url():
-    url_uuid = "https://mangadex.org/title/0aea9f43-d4a9-4bf7-bebc-550a512f9b95/shikimori-s-not-just-a-cutie"
-    link_file = "tests/testfile.txt"
     language = "en"
     chapters = "1"
     file_format = "cbz"
@@ -30,7 +28,6 @@ def test_no_read_and_url():
 def test_no_chaps():
     url_uuid = "https://mangadex.org/title/0aea9f43-d4a9-4bf7-bebc-550a512f9b95/shikimori-s-not-just-a-cutie"
     language = "en"
-    chapters = ""
     file_format = "cbz"
     download_path = "tests"
     command_args = f"-u {url_uuid} -l {language} --path {download_path} --format {file_format} --debug"
diff --git a/tests/test_05_hooks.py b/tests/test_05_hooks.py
index 8eb75ac..31ee074 100644
--- a/tests/test_05_hooks.py
+++ b/tests/test_05_hooks.py
@@ -40,7 +40,7 @@ def test_manga_pre_hook(wait_10s):
         manga_pre_hook,
     ]
     script_path = "manga-dlp.py"
-    command = ["python3", script_path] + command_args
+    command = ["python3", script_path, *command_args]
 
     assert subprocess.call(command) == 0
     assert hook_file.is_file()
@@ -72,7 +72,7 @@ def test_manga_post_hook(wait_10s):
         manga_post_hook,
     ]
     script_path = "manga-dlp.py"
-    command = ["python3", script_path] + command_args
+    command = ["python3", script_path, *command_args]
 
     assert subprocess.call(command) == 0
     assert hook_file.is_file()
@@ -104,7 +104,7 @@ def test_chapter_pre_hook(wait_10s):
         chapter_pre_hook,
     ]
     script_path = "manga-dlp.py"
-    command = ["python3", script_path] + command_args
+    command = ["python3", script_path, *command_args]
 
     assert subprocess.call(command) == 0
     assert hook_file.is_file()
@@ -136,7 +136,7 @@ def test_chapter_post_hook(wait_10s):
         chapter_post_hook,
     ]
     script_path = "manga-dlp.py"
-    command = ["python3", script_path] + command_args
+    command = ["python3", script_path, *command_args]
 
     assert subprocess.call(command) == 0
     assert hook_file.is_file()
@@ -176,7 +176,7 @@ def test_all_hooks(wait_10s):
         chapter_post_hook,
     ]
     script_path = "manga-dlp.py"
-    command = ["python3", script_path] + command_args
+    command = ["python3", script_path, *command_args]
 
     assert subprocess.call(command) == 0
     assert Path("tests/manga-pre2.txt").is_file()
diff --git a/tests/test_06_cache.py b/tests/test_06_cache.py
index a3e065b..c46c96b 100644
--- a/tests/test_06_cache.py
+++ b/tests/test_06_cache.py
@@ -6,7 +6,7 @@ from mangadlp.cache import CacheDB
 
 def test_cache_creation():
     cache_file = Path("cache.json")
-    cache = CacheDB(cache_file, "abc", "en", "test")
+    CacheDB(cache_file, "abc", "en", "test")
 
     assert cache_file.exists()
     cache_file.unlink()
diff --git a/tests/test_07_metadata.py b/tests/test_07_metadata.py
index 33ff523..c67b1fe 100644
--- a/tests/test_07_metadata.py
+++ b/tests/test_07_metadata.py
@@ -133,7 +133,7 @@ def test_metadata_chapter_validity(wait_20s):
     schema = xmlschema.XMLSchema("mangadlp/metadata/ComicInfo_v2.0.xsd")
 
     script_path = "manga-dlp.py"
-    command = ["python3", script_path] + command_args
+    command = ["python3", script_path, *command_args]
 
     assert subprocess.call(command) == 0
     assert metadata_path.is_file()
diff --git a/tests/test_11_api_mangadex.py b/tests/test_11_api_mangadex.py
index 38ace21..fc28787 100644
--- a/tests/test_11_api_mangadex.py
+++ b/tests/test_11_api_mangadex.py
@@ -56,7 +56,7 @@ def test_alt_title_fallback():
     forcevol = False
     test = Mangadex(url_uuid, language, forcevol)
 
-    assert test.manga_title == "Iruma à l’école des démons"
+    assert test.manga_title == "Iruma à l`école des démons"
 
 
 def test_chapter_infos():
@@ -206,7 +206,6 @@ def test_get_chapter_images():
     test = Mangadex(url_uuid, language, forcevol)
     img_base_url = "https://uploads.mangadex.org"
     chapter_hash = "0752bc5db298beff6b932b9151dd8437"
-    chapter_uuid = "e86ec2c4-c5e4-4710-bfaa-7604f00939c7"
     chapter_num = "1"
     test_list = [
         f"{img_base_url}/data/{chapter_hash}/x1-0deb4c9bfedd5be49e0a90cfb17cf343888239898c9e7451d569c0b3ea2971f4.jpg",