### Question:
Utils { public static double toSeconds(long nanoseconds) { return nanoseconds / 1000000000.0; }  static double toSeconds(long nanoseconds);  }### Answer:
@Test public void correctlyConvertsNanoSecondsToSeconds() { double expected = 0.123456789; long nanoseconds = 123456789; double actual = Utils.toSeconds(nanoseconds); assertEquals(expected, actual); }