Testing

Unit tests

cargo test

31 tests covering:

• Mortgage calculation: standard and zero-rate scenarios
• Area/layout extraction: parsing Sreality listing names
• Czech tax: gross-to-net wage conversion
• Savings calculator: various input combinations
• Living expenses: regional lookup
• Linear regression: statistical functions
• Forecast: slope calculation and extrapolation
• Scenario: input validation, computation, sorting, severity colors

Linting

cargo clippy -- -D warnings

Must pass clean (zero warnings as errors).

Formatting

cargo fmt --check

Uses project rustfmt.toml settings:

• max_width = 100
• use_small_heuristics = "Max"