Function test_files 

pub(crate) fn test_files(
    cache_dir: CacheDir,
    file_type: TestFileFormat,
    repositories: Option<Vec<PackageRepositories>>,
) -> Result<(), Error>

Runs tests for a specific type of testing file format handling binaries for official ArchLinux packages, source repositories and databases.

This function relegates to functions that:

• Download packages.
• Test file parsers on all files.
• Clean up downloaded files.