### Question:
CustomStringApi { public static String base64(String line) { return getEncoder().encodeToString(line.getBytes()); }  static String findGroup(String regex, String line); static String findGroupOrDefault(String regex, String line, String defaultValue); static String base64(String line); static String delete(String line, String toDelete); static String substringAfterFirst(String line, String substring); static String substringAfterLast(String line, String substring);  }### Answer:
@Test void testBase64() { assertEquals("aGVsbG8=", base64("hello")); }