@Test
public void testGetPreInstallUrls() throws Exception {

    final File file1 = new File("./test1.zip");
    final File file2 = new File("./test2.zip");
    final OakMachine machine = builder().withPreInstallUrl(file1.toURI().toURL(), file2.toURI().toURL()).build();
    assertEquals("expect urls",
            Stream.of(file1.getAbsoluteFile(), file2.getAbsoluteFile())
                    .map(compose1(File::toURI, uncheck1(URI::toURL))).collect(Collectors.toList()),
            machine.getPreInstallUrls());
}