Coverage for src/usls/application/_helpers.py: 100%

1"""Internal helpers for USLSService — validation and input normalization. 

2 

3Extracted from service.py to keep that file focused on use-case orchestration. 

4Schedule-strength analytics helpers live in ``_analytics_helpers.py``. 

5""" 

6 

7_DATE_PATTERN_LENGTH = 8 

8 

9 

10def _validate_yyyymmdd(value: str, label: str) -> str: 

11 """Return ``value`` if it is exactly 8 digits, else raise ValueError citing ``label``.""" 

12 if not value.isdigit() or len(value) != _DATE_PATTERN_LENGTH: 

13 raise ValueError(f"{label} must be in YYYYMMDD format, got {value!r}") 

14 return value