The code changes in `pattern_test.go` update the ARR body parsing logic. The message body parsing now correctly handles ARR bodies with a different pattern format. This ensures accurate extraction of data based on patterns and improves the overall functionality of the code.
The code changes rename the "Text" field in the AFTN struct to "Body" to improve clarity and consistency. This change aligns with the naming convention used in other parts of the codebase and enhances code readability.