@Test
public void testReadBytesFromFile() throws IOException {

    String filename = "build/bytes_test_file";
    byte[] bytes = {1, 2, 3, 10, 11, 12};
    Files.write(bytes, new File(filename));
    byte[] result = FileSystemUtil.readBytesFromFile(filename);
    assertNotNull(result);
    assertThat(result, is(bytes));
}