This test verifies that logs below the ERROR level are properly muted when plaintext logging is enabled without JSON formatting. It ensures that log output adheres to the configured log level settings.
Added validation to ensure log levels are within valid bounds in `SetLogLevel`. Simplified prefix mapping logic by removing the fallback to INFO level. Expanded test coverage with new test cases for plain text and JSON log outputs.
Introduce unit tests to verify the string and color outputs of StoneLevel. These tests ensure the correct mapping of log levels to their respective string values and color codes.
