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145 lines
3.6 KiB
C++
145 lines
3.6 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibTest/TestCase.h>
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#include <AK/BinarySearch.h>
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#include <AK/Span.h>
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#include <AK/Vector.h>
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#include <cstring>
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#include <new>
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using namespace Test::Randomized;
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TEST_CASE(vector_ints)
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{
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Vector<int> ints;
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ints.append(1);
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ints.append(2);
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ints.append(3);
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auto test1 = *binary_search(ints, 1);
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auto test2 = *binary_search(ints, 2);
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auto test3 = *binary_search(ints, 3);
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EXPECT_EQ(test1, 1);
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EXPECT_EQ(test2, 2);
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EXPECT_EQ(test3, 3);
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}
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TEST_CASE(span_rvalue_reference)
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{
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Array<long, 3> array { 1, 2, 3 };
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size_t nearby_index = 0;
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auto* pointer = binary_search(array.span(), 2, &nearby_index);
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EXPECT_EQ(nearby_index, 1u);
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EXPECT_EQ(pointer, &array[1]);
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}
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TEST_CASE(array_doubles)
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{
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Array<double, 3> array { 1.1, 9.9, 33.33 };
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EXPECT_EQ(binary_search(array, 1.1), &array[0]);
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EXPECT_EQ(binary_search(array, 33.33), &array[2]);
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EXPECT_EQ(binary_search(array, 9.9), &array[1]);
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}
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TEST_CASE(vector_strings)
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{
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Vector<DeprecatedString> strings;
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strings.append("bat");
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strings.append("cat");
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strings.append("dog");
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auto string_compare = [](DeprecatedString const& a, DeprecatedString const& b) -> int {
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return strcmp(a.characters(), b.characters());
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};
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auto test1 = *binary_search(strings, DeprecatedString("bat"), nullptr, string_compare);
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auto test2 = *binary_search(strings, DeprecatedString("cat"), nullptr, string_compare);
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auto test3 = *binary_search(strings, DeprecatedString("dog"), nullptr, string_compare);
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EXPECT_EQ(test1, DeprecatedString("bat"));
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EXPECT_EQ(test2, DeprecatedString("cat"));
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EXPECT_EQ(test3, DeprecatedString("dog"));
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}
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TEST_CASE(single_element)
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{
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Vector<int> ints;
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ints.append(1);
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auto test1 = *binary_search(ints, 1);
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EXPECT_EQ(test1, 1);
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}
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TEST_CASE(not_found)
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{
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Vector<int> ints;
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ints.append(1);
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ints.append(2);
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ints.append(3);
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auto test1 = binary_search(ints, -1);
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auto test2 = binary_search(ints, 0);
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auto test3 = binary_search(ints, 4);
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EXPECT_EQ(test1, nullptr);
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EXPECT_EQ(test2, nullptr);
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EXPECT_EQ(test3, nullptr);
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}
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TEST_CASE(no_elements)
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{
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Vector<int> ints;
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auto test1 = binary_search(ints, 1);
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EXPECT_EQ(test1, nullptr);
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}
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TEST_CASE(constexpr_array_search)
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{
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constexpr Array<int, 3> array = { 1, 17, 42 };
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static_assert(binary_search(array, 42) == &array[2]);
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static_assert(binary_search(array, 17) == &array[1]);
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static_assert(binary_search(array, 3) == nullptr);
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}
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TEST_CASE(unsigned_to_signed_regression)
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{
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Array<u32, 5> const input { 0, 1, 2, 3, 4 };
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// The algorithm computes 1 - input[2] = -1, and if this is (incorrectly) cast
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// to an unsigned then it will look in the wrong direction and miss the 1.
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size_t nearby_index = 1;
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EXPECT_EQ(binary_search(input, 1u, &nearby_index), &input[1]);
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EXPECT_EQ(nearby_index, 1u);
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}
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RANDOMIZED_TEST_CASE(finds_number_that_is_present)
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{
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GEN(vec, Gen::vector(1, 16, []() { return Gen::unsigned_int(); }));
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GEN(i, Gen::unsigned_int(0, vec.size() - 1));
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AK::quick_sort(vec);
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u32 n = vec[i];
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auto ptr = binary_search(vec, n);
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EXPECT_NE(ptr, nullptr);
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EXPECT_EQ(*ptr, n);
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}
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RANDOMIZED_TEST_CASE(doesnt_find_number_that_is_not_present)
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{
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GEN(vec, Gen::vector(1, 16, []() { return Gen::unsigned_int(); }));
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AK::quick_sort(vec);
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u32 not_present = 0;
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while (!vec.find(not_present).is_end()) {
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++not_present;
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}
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EXPECT_EQ(binary_search(vec, not_present), nullptr);
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}
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