chore: give unused function a test annotation

Former-commit-id: 94acaa37c593f4952c349d663de71e3f1990926b

src/context.rs

@@ -177,6 +177,7 @@ pub struct DirContents {
 }
 
 impl DirContents {
+    #[cfg(test)]
     fn from_path(base: &PathBuf) -> Result<Self, std::io::Error> {
         Self::from_path_with_timeout(base, Duration::from_secs(30))
     }