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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.predicate.utils;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;
/**
* @author bjorncs
*/
public class PostingListSearchTest {
@Test
void require_that_search_find_index_of_first_element_higher() {
int[] values = {2, 8, 4000, 4001, 4100, 10000, 10000000};
int length = values.length;
assertEquals(0, PostingListSearch.interpolationSearch(values, 0, length, 1));
for (int value = 3; value < 8; value++) {
assertEquals(1, PostingListSearch.interpolationSearch(values, 0, length, value));
}
assertEquals(2, PostingListSearch.interpolationSearch(values, 0, length, 8));
assertEquals(values.length, PostingListSearch.interpolationSearch(values, 0, length, 10000000));
assertEquals(values.length, PostingListSearch.interpolationSearch(values, 0, length, 10000001));
}
@Test
void require_that_search_is_correct_for_one_size_arrays() {
int[] values = {100};
assertEquals(0, PostingListSearch.interpolationSearch(values, 0, 1, 0));
assertEquals(0, PostingListSearch.interpolationSearch(values, 0, 1, 99));
assertEquals(1, PostingListSearch.interpolationSearch(values, 0, 1, 100));
assertEquals(1, PostingListSearch.interpolationSearch(values, 0, 1, 101));
assertEquals(1, PostingListSearch.interpolationSearch(values, 0, 1, 10000));
}
@Test
void require_that_search_is_correct_for_sub_arrays() {
int[] values = {0, 2, 8, 4000, 4001, 4100};
assertEquals(1, PostingListSearch.interpolationSearch(values, 1, 2, 1));
assertEquals(2, PostingListSearch.interpolationSearch(values, 1, 2, 2));
assertEquals(2, PostingListSearch.interpolationSearch(values, 1, 4, 2));
assertEquals(4, PostingListSearch.interpolationSearch(values, 1, 4, 4000));
assertEquals(5, PostingListSearch.interpolationSearch(values, 1, 5, 4001));
assertEquals(5, PostingListSearch.interpolationSearch(values, 1, 5, 4101));
}
@Test
void require_that_search_is_correct_for_large_arrays() {
int length = 10000;
int[] values = new int[length];
for (int i = 0; i < length; i++) {
values[i] = 2 * i;
}
assertEquals(1, PostingListSearch.interpolationSearch(values, 1, length, 0));
assertEquals(1227, PostingListSearch.interpolationSearch(values, 1, length, 2452));
assertEquals(1227, PostingListSearch.interpolationSearch(values, 1, length, 2453));
assertEquals(1228, PostingListSearch.interpolationSearch(values, 1, length, 2454));
}
}
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