static List<String> findClassFiles(JarFile jarFile, String className) {
        String filename = className + ".class";
        return jarFile.stream()
                .map(ZipEntry::getName)
                .map(Paths::get)
                .filter(byFilename(filename))
                .map(Path::toString)
                .collect(Collectors.toList());
    }
@Test
    public void should_NOT_find_class_in_jar() throws IOException {
        assertThat(dummyJarFile).exists();

        try (JarFile jarFile = new JarFile(dummyJarFile.toFile())) {
            List<String> classFiles = JarScanner.findClassFiles(jarFile, "NonExistingClass");

            assertThat(classFiles).isEmpty();
        }
    }