Implement reconnect, idle reporting, and security hardening

tests/test_config.py

@@ -1,5 +1,7 @@
 """Config 테스트."""
 
+import pytest
+
 from lazy_enter.config import Config
 
 
@@ -9,3 +11,27 @@ def test_config_defaults():
     assert config.pty_read_timeout == 5
     assert config.output_buffer_interval == 2.0
     assert config.max_message_length == 3000
+    assert config.reconnect_delay_seconds == 5.0
+    assert config.output_idle_report_seconds == 120
+    assert config.input_idle_report_seconds == 300
+
+
+def test_validate_required_settings_missing() -> None:
+    config = Config()
+    config.slack_bot_token = ""
+    config.slack_app_token = ""
+    config.allowed_user_id = ""
+    config.allowed_channel_id = ""
+
+    with pytest.raises(ValueError):
+        config.validate_required_settings()
+
+
+def test_validate_required_settings_ok() -> None:
+    config = Config()
+    config.slack_bot_token = "xoxb-test"
+    config.slack_app_token = "xapp-test"
+    config.allowed_user_id = "U000"
+    config.allowed_channel_id = "C000"
+
+    config.validate_required_settings()