public static FileSystem newFileSystem() {
    return newFileSystem(newRandomFileSystemName());
  }
Creates a new in-memory file system with a {@linkplain Configuration#forCurrentPlatform()
default configuration} appropriate to the current operating system.

<p>More specifically, if the operating system is Windows, {@link Configuration#windows()} is
used; if the operating system is Mac OS X, {@link Configuration#osX()} is used; otherwise,
{@link Configuration#unix()} is used.
jimfs/src/main/java/com/google/common/jimfs/Jimfs.java