### Question:
StringUtil { public static boolean couldBeValidUrl (String url) { return url.matches("[A-Za-z0-9\\-._~:/?#\\[\\]@!$&'()*+,;=%]+"); }  static boolean couldBeValidUrl(String url); static boolean isBlank(String value); static int[] parseIntArray(String source); static String[] parseStringArray(String source); static String[] parseStringArray(String source, boolean intern); static String deNull(String value); static String hexlate(byte[] bytes, int count); static String hexlate(byte[] bytes); static String join(Object[] values); static String join(Object[] values, boolean escape); static String join(Object[] values, String separator);  }### Answer:
@Test public void testCouldBeValidUrl () { assertTrue(couldBeValidUrl("http: assertTrue(couldBeValidUrl("http: assertTrue(couldBeValidUrl("https: assertFalse(couldBeValidUrl("http: assertFalse(couldBeValidUrl("http: }