@Test
public void shouldAddRateToFirstWindowSlot() {
// Given
RateWindow rateWindow = createRateWindow(1);
long timestamp = getNowTimestamp(SAMPLE_RATE);
// When
rateWindow.incrementForTimestamp(timestamp);
// Then
assertEquals(rateWindow.getAverageRate(), 1D);
}
@Test
public void shouldAddRatesToSameWindowSlotWithSameTimestamp() {
// Given
RateWindow rateWindow = createRateWindow(1);
long timestamp1 = getNowTimestamp(SAMPLE_RATE);
rateWindow.incrementForTimestamp(timestamp1);
// When
rateWindow.incrementForTimestamp(timestamp1);
// Then
assertEquals(rateWindow.getAverageRate(), 2D);
}
@Test
public void shouldAddRatesToDifferentWindowSlotsWithAnEmptySlotBetween() {
// Given
RateWindow rateWindow = createRateWindow(2);
long timestamp1 = getNowTimestamp(SAMPLE_RATE);
long timestamp2 = timestamp1 + (SAMPLE_RATE * 2);
rateWindow.incrementForTimestamp(timestamp1);
// When
rateWindow.incrementForTimestamp(timestamp2);
// Then
assertEquals(rateWindow.getAverageRate(), 0.5);
}
@Test
public void shouldAddRatesToDifferentWindowSlots() {
// Given
RateWindow rateWindow = createRateWindow(1);
long timestamp1 = getNowTimestamp(SAMPLE_RATE);
long timestamp2 = timestamp1 + SAMPLE_RATE;
rateWindow.incrementForTimestamp(timestamp1);
// When
rateWindow.incrementForTimestamp(timestamp2);
// Then
assertEquals(rateWindow.getAverageRate(), 1D);
}
@Test
public void shouldGetAverageRateWhenTimeIsJustInLatestIndex() {
// Given
RateWindow rateWindow = createRateWindow(2);
long timestamp1 = getNowTimestamp(SAMPLE_RATE);
long timestamp2 = timestamp1 + SAMPLE_RATE;
given(timer.now()).willReturn(timestamp2 + SAMPLE_RATE - 1);
rateWindow.incrementForTimestamp(timestamp1);
rateWindow.incrementForTimestamp(timestamp2);
// When
double rate = rateWindow.getAverageRate();
// Then
assertEquals(rate, 0.5D);
}