Stuff and things

tests/test_settings.py

@@ -10,7 +10,7 @@ from discord_rss_bot.settings import data_dir, default_custom_message, get_reade
 def test_reader() -> None:
     """Test the reader."""
     reader: Reader = get_reader()
-    assert isinstance(reader, Reader)
+    assert isinstance(reader, Reader), f"The reader should be an instance of Reader. But it was '{type(reader)}'."
 
     # Test the reader with a custom location.
     with tempfile.TemporaryDirectory() as temp_dir:
@@ -19,7 +19,8 @@ def test_reader() -> None:
 
         custom_loc: pathlib.Path = pathlib.Path(temp_dir, "custom_loc_db.sqlite")
         custom_reader: Reader = get_reader(custom_location=str(custom_loc))
-        assert isinstance(custom_reader, Reader)
+        assert_msg = f"The custom reader should be an instance of Reader. But it was '{type(custom_reader)}'."
+        assert isinstance(custom_reader, Reader), assert_msg
 
         # Close the reader, so we can delete the directory.
         custom_reader.close()
@@ -27,12 +28,13 @@ def test_reader() -> None:
 
 def test_data_dir() -> None:
     """Test the data directory."""
-    assert Path.exists(Path(data_dir))
+    assert Path.exists(Path(data_dir)), f"The data directory '{data_dir}' should exist."
 
 
 def test_default_custom_message() -> None:
     """Test the default custom message."""
-    assert default_custom_message == "{{entry_title}}\n{{entry_link}}"
+    assert_msg = f"The default custom message should be '{{entry_title}}\n{{entry_link}}'. But it was '{default_custom_message}'."  # noqa: E501
+    assert default_custom_message == "{{entry_title}}\n{{entry_link}}", assert_msg
 
 
 def test_get_webhook_for_entry() -> None:
@@ -52,7 +54,7 @@ def test_get_webhook_for_entry() -> None:
         # Add a webhook to the database.
         custom_reader.set_tag("https://www.reddit.com/r/movies.rss", "webhook", "https://example.com")  # type: ignore
         our_tag: str = custom_reader.get_tag("https://www.reddit.com/r/movies.rss", "webhook")  # type: ignore
-        assert our_tag == "https://example.com"
+        assert our_tag == "https://example.com", f"The tag should be 'https://example.com'. But it was '{our_tag}'."
 
         # Close the reader, so we can delete the directory.
         custom_reader.close()