Add test

Assert that loading from cache does not over-write files.

commons/src/cache/app_cache.rs

@@ -387,6 +387,31 @@ mod tests {
  assert_eq!(layer_name!("cache_my_input"), layer);
  }
 
+ #[test]
+ fn test_load_doesnot_clobber_files() {
+ let tmpdir = tempfile::tempdir().unwrap();
+ let cache_path = tmpdir.path().join("cache");
+ let app_path = tmpdir.path().join("app");
+ fs_err::create_dir_all(&cache_path).unwrap();
+ fs_err::create_dir_all(&app_path).unwrap();
+
+ fs_err::write(app_path.join("a.txt"), "app").unwrap();
+ fs_err::write(cache_path.join("a.txt"), "cache").unwrap();
+
+ let store = AppCache {
+ path: app_path.clone(),
+ cache: cache_path,
+ limit: Byte::from_u64(512),
+ keep_path: KeepPath::Runtime,
+ cache_state: CacheState::NewEmpty,
+ };
+
+ store.load().unwrap();
+
+ let contents = fs_err::read_to_string(app_path.join("a.txt")).unwrap();
+ assert_eq!("app", contents);
+ }
+
  #[test]
  fn test_copying_back_to_cache() {
  let tmpdir = tempfile::tempdir().unwrap();