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package com.yahoo.search.dispatch;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
public class TopKEstimatorTest {
@Test
public void requireHitsAreEstimatedAccordingToPartitionsAndProbability() {
TopKEstimator estimator = new TopKEstimator(30, 0.999);
assertEquals(91.97368471911312, estimator.estimateExactK(200, 3), 0.0);
assertEquals(92, estimator.estimateK(200, 3));
assertEquals(37.96328109101396, estimator.estimateExactK(200, 10), 0.0);
assertEquals(38, estimator.estimateK(200, 10));
assertEquals(23.815737601023095, estimator.estimateExactK(200, 20), 0.0);
assertEquals(24, estimator.estimateK(200, 20));
assertEquals(37.96328109101396, estimator.estimateExactK(200, 10, 0.999), 0.0);
assertEquals(38, estimator.estimateK(200, 10, 0.999));
assertEquals(34.36212304875885, estimator.estimateExactK(200, 10, 0.99), 0.0);
assertEquals(35, estimator.estimateK(200, 10, 0.99));
assertEquals(41.44244358524574, estimator.estimateExactK(200, 10, 0.9999), 0.0);
assertEquals(42, estimator.estimateK(200, 10, 0.9999));
assertEquals(44.909040374464155, estimator.estimateExactK(200, 10, 0.99999), 0.0);
assertEquals(45, estimator.estimateK(200, 10, 0.99999));
}
}
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