NthLastModifiedTimeTrackerTest.java

package storm.starter.tools;

import static org.fest.assertions.api.Assertions.assertThat;

import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;

import backtype.storm.utils.Time;

public class NthLastModifiedTimeTrackerTest {

    private static final int ANY_NUM_TIMES_TO_TRACK = 3;
    private static final int MILLIS_IN_SEC = 1000;

    @DataProvider
    public Object[][] illegalNumTimesData() {
        return new Object[][] { { -10 }, { -3 }, { -2 }, { -1 }, { 0 } };
    }

    @Test(expectedExceptions = IllegalArgumentException.class, dataProvider = "illegalNumTimesData")
    public void negativeOrZeroNumTimesToTrackShouldThrowIAE(int numTimesToTrack) {
        new NthLastModifiedTimeTracker(numTimesToTrack);
    }

    @DataProvider
    public Object[][] legalNumTimesData() {
        return new Object[][] { { 1 }, { 2 }, { 3 }, { 20 } };
    }

    @Test(dataProvider = "legalNumTimesData")
    public void positiveNumTimesToTrackShouldBeOk(int numTimesToTrack) {
        new NthLastModifiedTimeTracker(numTimesToTrack);
    }

    @DataProvider
    public Object[][] whenNotYetMarkedAsModifiedData() {
        return new Object[][] { { 0 }, { 1 }, { 2 }, { 3 }, { 4 }, { 5 }, { 8 }, { 10 } };
    }

    @Test(dataProvider = "whenNotYetMarkedAsModifiedData")
    public void shouldReturnCorrectModifiedTimeEvenWhenNotYetMarkedAsModified(int secondsToAdvance) {
        // given
        Time.startSimulating();
        NthLastModifiedTimeTracker tracker = new NthLastModifiedTimeTracker(ANY_NUM_TIMES_TO_TRACK);

        // when
        advanceSimulatedTimeBy(secondsToAdvance);
        int seconds = tracker.secondsSinceOldestModification();

        // then
        assertThat(seconds).isEqualTo(secondsToAdvance);

        // cleanup
        Time.stopSimulating();
    }

    @DataProvider
    public Object[][] simulatedTrackerIterations() {
        return new Object[][] {
                { 1, new int[] { 0, 1 }, new int[] { 0, 0 } },
                { 1, new int[] { 0, 2 }, new int[] { 0, 0 } },
                { 2, new int[] { 2, 2 }, new int[] { 2, 2 } },
                { 2, new int[] { 0, 4 }, new int[] { 0, 4 } },
                { 1, new int[] { 1, 1, 1, 1, 1, 1, 1 }, new int[] { 0, 0, 0, 0, 0, 0, 0 } },
                { 1, new int[] { 1, 2, 3, 4, 5, 6, 7 }, new int[] { 0, 0, 0, 0, 0, 0, 0 } },
                { 2, new int[] { 1, 1, 1, 1, 1, 1, 1 }, new int[] { 1, 1, 1, 1, 1, 1, 1 } },
                { 2, new int[] { 2, 2, 2, 2, 2, 2, 2 }, new int[] { 2, 2, 2, 2, 2, 2, 2 } },
                { 2, new int[] { 1, 2, 3, 4, 5, 6, 7 }, new int[] { 1, 2, 3, 4, 5, 6, 7 } },
                { 3, new int[] { 1, 1, 1, 1, 1, 1, 1 }, new int[] { 1, 2, 2, 2, 2, 2, 2 } },
                { 3, new int[] { 1, 2, 3, 4, 5, 6, 7 }, new int[] { 1, 3, 5, 7, 9, 11, 13 } },
                { 3, new int[] { 2, 2, 2, 2, 2, 2, 2 }, new int[] { 2, 4, 4, 4, 4, 4, 4 } },
                { 4, new int[] { 1, 1, 1, 1, 1, 1, 1 }, new int[] { 1, 2, 3, 3, 3, 3, 3 } },
                { 4, new int[] { 1, 2, 3, 4, 5, 6, 7 }, new int[] { 1, 3, 6, 9, 12, 15, 18 } },
                { 4, new int[] { 2, 2, 2, 2, 2, 2, 2 }, new int[] { 2, 4, 6, 6, 6, 6, 6 } },
                { 5, new int[] { 1, 1, 1, 1, 1, 1, 1 }, new int[] { 1, 2, 3, 4, 4, 4, 4 } },
                { 5, new int[] { 1, 2, 3, 4, 5, 6, 7 }, new int[] { 1, 3, 6, 10, 14, 18, 22 } },
                { 5, new int[] { 2, 2, 2, 2, 2, 2, 2 }, new int[] { 2, 4, 6, 8, 8, 8, 8 } },
                { 6, new int[] { 1, 1, 1, 1, 1, 1, 1 }, new int[] { 1, 2, 3, 4, 5, 5, 5 } },
                { 6, new int[] { 1, 2, 3, 4, 5, 6, 7 }, new int[] { 1, 3, 6, 10, 15, 20, 25 } },
                { 6, new int[] { 2, 2, 2, 2, 2, 2, 2 }, new int[] { 2, 4, 6, 8, 10, 10, 10 } },
                { 3, new int[] { 1, 2, 3 }, new int[] { 1, 3, 5 } } };
    }

    @Test(dataProvider = "simulatedTrackerIterations")
    public void shouldReturnCorrectModifiedTimeWhenMarkedAsModified(int numTimesToTrack,
        int[] secondsToAdvancePerIteration, int[] expLastModifiedTimes) {
        // given
        Time.startSimulating();
        NthLastModifiedTimeTracker tracker = new NthLastModifiedTimeTracker(numTimesToTrack);

        int[] modifiedTimes = new int[expLastModifiedTimes.length];

        // when
        int i = 0;
        for (int secondsToAdvance : secondsToAdvancePerIteration) {
            advanceSimulatedTimeBy(secondsToAdvance);
            tracker.markAsModified();
            modifiedTimes[i] = tracker.secondsSinceOldestModification();
            i++;
        }

        // then
        assertThat(modifiedTimes).isEqualTo(expLastModifiedTimes);

        // cleanup
        Time.stopSimulating();
    }

    private void advanceSimulatedTimeBy(int seconds) {
        Time.advanceTime(seconds * MILLIS_IN_SEC);
    }
}