feat: add create-config subcommand to generate default config (#577)

tests/unit/test_bot.py

@@ -2,12 +2,12 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
 # SPDX-ArtifactOfProjectHomePage: https://github.com/Second-Hand-Friends/kleinanzeigen-bot/
 import gc, pytest  # isort: skip
+import pathlib
 
 from kleinanzeigen_bot import KleinanzeigenBot
 
 
 class TestKleinanzeigenBot:
-
     @pytest.fixture
     def bot(self) -> KleinanzeigenBot:
         return KleinanzeigenBot()
@@ -26,6 +26,37 @@ class TestKleinanzeigenBot:
         assert bot.ads_selector == "all"
         assert bot.keep_old_ads
 
+    def test_parse_args_create_config(self, bot:KleinanzeigenBot) -> None:
+        """Test parsing of create-config command"""
+        bot.parse_args(["app", "create-config"])
+        assert bot.command == "create-config"
+
+    def test_create_default_config_logs_error_if_exists(self, tmp_path:pathlib.Path, bot:KleinanzeigenBot, caplog:pytest.LogCaptureFixture) -> None:
+        """Test that create_default_config logs an error if the config file already exists."""
+        config_path = tmp_path / "config.yaml"
+        config_path.write_text("dummy: value")
+        bot.config_file_path = str(config_path)
+        with caplog.at_level("ERROR"):
+            bot.create_default_config()
+        assert any("already exists" in m for m in caplog.messages)
+
+    def test_create_default_config_creates_file(self, tmp_path:pathlib.Path, bot:KleinanzeigenBot) -> None:
+        """Test that create_default_config creates a config file if it does not exist."""
+        config_path = tmp_path / "config.yaml"
+        bot.config_file_path = str(config_path)
+        assert not config_path.exists()
+        bot.create_default_config()
+        assert config_path.exists()
+        content = config_path.read_text()
+        assert "username: changeme" in content
+
+    def test_load_config_handles_missing_file(self, tmp_path:pathlib.Path, bot:KleinanzeigenBot) -> None:
+        """Test that load_config creates a default config file if missing. No info log is expected anymore."""
+        config_path = tmp_path / "config.yaml"
+        bot.config_file_path = str(config_path)
+        bot.load_config()
+        assert config_path.exists()
+
     def test_get_version(self, bot:KleinanzeigenBot) -> None:
         """Test version retrieval"""
         version = bot.get_version()