@PublicAPI(usage = ACCESS)
    public JavaClasses importUrl(URL url) {
        return importUrls(singletonList(url));
    }
@Test
    public void is_resilient_against_broken_ClassFileSources() throws MalformedURLException {
        JavaClasses classes = new ClassFileImporter().importUrl(new File("/broken.class").toURI().toURL());
        assertThat(classes).isEmpty();

        classes = new ClassFileImporter().importUrl(new File("/broken.jar").toURI().toURL());
        assertThat(classes).isEmpty();
    }