override val badValue: Cache =
        Cache(
          object : ForwardingFileSystem(FakeFileSystem()) {
            override fun onPathParameter(
              path: Path,
              functionName: String,
              parameterName: String,
            ): Path = TODO()
          },
          "/cash".toPath(),
          1,
        )

    fileSystem.createDirectories(cache.directoryPath)
    val loggingFileSystem: FileSystem =
      object : ForwardingFileSystem(fileSystem) {
        override fun onPathParameter(
          path: Path,
          functionName: String,
          parameterName: String,
        ): Path {
          events.add("$functionName:$path")
          return path
        }