### Question:
UnixSocketFileSystemProvider extends DelegatingFileSystemProvider { @Override public FileSystem getFileSystem(final URI uri) { return super.getFileSystem(convert(uri)); } UnixSocketFileSystemProvider();  UnixSocketFileSystemProvider(final FileSystemProvider delegate); @Override String getScheme(); @Override FileSystem newFileSystem(final URI uri, final Map<String, ?> env); @Override FileSystem getFileSystem(final URI uri); @Override Path getPath(final URI uri);  }### Answer:
@Test public void getFileSystem() { URI uri = URI.create("unix:/bogus.ipc"); provider.getFileSystem(uri); URI u = URI.create("file:/bogus.ipc"); verify(delegate).getFileSystem(u); }