A Test-Driven Development (TDD) workflow was followed throughout the project. Every component — from the lowest-level file reader to the GUI window — has a corresponding Google Test suite that was written before (or alongside) the production code. This ensures each module behaves correctly in isolation and makes regressions immediately visible.

SysfsRead class

SysfsReader (include/SysfsRead.hpp, src/core/SysfsRead.cxx) is the lowest-level component. It opens a sysfs-like file and translates its raw text content into a SysfsStatus enum:

File content	Status
`"1"`	`Enabled`
`"error: temp too high"`	`ErrorTempTooHigh`
empty / whitespace-only	`Empty`
file missing	`Unreachable`
anything else	`UnexpectedValue`

The reader never throws on I/O errors; every outcome is expressed through the enum so callers can react without exception handling. A helper trim_in_place strips trailing whitespace and newlines before comparison.

Tests: tests/test_sysfs_read.cxx — covers all five status branches by writing controlled content to a temporary file.