### Question:
RandomUtils { public static long nextLong(final long start, final long end) { return (long) nextDouble(start, end); }  static String randomAlpha(int length); static String randomNumeric(int length); static String randomAlphaNumeric(int length); static long nextLong(final long start, final long end); static double nextDouble(final double start, final double end);  }### Answer:
@Test public void testNextLong() { long start = 100; long end = 150; for (int i = 0; i < 100; i++) { long random = RandomUtils.nextLong(start, end); assertThat(random, Matchers.greaterThanOrEqualTo(start)); assertThat(random, Matchers.lessThan(end)); } }