1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "suggest/core/dictionary/bloom_filter.h" 18 19 #include <gtest/gtest.h> 20 21 #include <algorithm> 22 #include <cstdlib> 23 #include <functional> 24 #include <random> 25 #include <unordered_set> 26 #include <vector> 27 28 namespace latinime { 29 namespace { 30 31 TEST(BloomFilterTest, TestFilter) { 32 static const int TEST_RANDOM_DATA_MAX = 65536; 33 static const int ELEMENT_COUNT = 1000; 34 std::vector<int> elements; 35 36 // Initialize data set with random integers. 37 { 38 // Use the uniform integer distribution [0, TEST_RANDOM_DATA_MAX]. 39 std::uniform_int_distribution<int> distribution(0, TEST_RANDOM_DATA_MAX); 40 auto randomNumberGenerator = std::bind(distribution, std::mt19937()); 41 for (int i = 0; i < ELEMENT_COUNT; ++i) { 42 elements.push_back(randomNumberGenerator()); 43 } 44 } 45 46 // Make sure BloomFilter contains nothing by default. 47 BloomFilter bloomFilter; 48 for (const int elem : elements) { 49 ASSERT_FALSE(bloomFilter.isInFilter(elem)); 50 } 51 52 // Copy some of the test vector into bloom filter. 53 std::unordered_set<int> elementsThatHaveBeenSetInFilter; 54 { 55 // Use the uniform integer distribution [0, 1]. 56 std::uniform_int_distribution<int> distribution(0, 1); 57 auto randomBitGenerator = std::bind(distribution, std::mt19937()); 58 for (const int elem : elements) { 59 if (randomBitGenerator() == 0) { 60 bloomFilter.setInFilter(elem); 61 elementsThatHaveBeenSetInFilter.insert(elem); 62 } 63 } 64 } 65 66 for (const int elem : elements) { 67 const bool existsInFilter = bloomFilter.isInFilter(elem); 68 const bool hasBeenSetInFilter = 69 elementsThatHaveBeenSetInFilter.find(elem) != elementsThatHaveBeenSetInFilter.end(); 70 if (hasBeenSetInFilter) { 71 EXPECT_TRUE(existsInFilter) << "elem: " << elem; 72 } 73 if (!existsInFilter) { 74 EXPECT_FALSE(hasBeenSetInFilter) << "elem: " << elem; 75 } 76 } 77 } 78 79 } // namespace 80 } // namespace latinime 81
