/** Next low number guess test. */
 @Test
 public void nextLowNumberGuessTest() {
   when(rangeGenerator.generateRange(4)).thenReturn(new Range(16, 32));
   long nextHighNumber = nextGuess.nextLowNumber(16);
   assertThat(nextHighNumber, is(16L));
   verify(rangeGenerator).generateRange(4);
 }
  /** Next low number fine grained guess test. */
  @Test
  public void nextLowNumberFineGrainedGuessTest() {
    ReflectionTestUtils.setField(nextGuess, "fineGrainedGuesser", fineGrainedGuess);

    int currentNum = 27;
    when(fineGrainedGuess.moveToPreviousRange(currentNum)).thenReturn(false);
    when(fineGrainedGuess.nextLowNumber(27)).thenReturn(26L);
    long nextLow = nextGuess.nextLowNumber(currentNum);
    assertThat(nextLow, is(26L));

    verify(rangeGenerator, never()).generateRange(Matchers.anyInt());
    verify(fineGrainedGuess, times(1)).moveToPreviousRange(currentNum);
    verify(fineGrainedGuess, times(1)).nextLowNumber(currentNum);
  }