@Test
public void testOpen() throws IOException {

	final String sign = "file_open";
	FilePath file = new FilePath(new Path(folder.getRoot().toPath().toString(), sign));
	writeFile(file, sign);
	byte[] buffer = new byte[1024];
	int len = file.getFileSystem().open(file.getPathStr()).read(buffer);
	Assert.assertEquals(new String(buffer, 0, len), sign);
}