libs/ftl/SmallMap_test.cpp

/*
 * Copyright 2020 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <ftl/SmallMap.h>
#include <gtest/gtest.h>

#include <cctype>

namespace android::test {

using ftl::SmallMap;

// Keep in sync with example usage in header file.
TEST(SmallMap, Example) {
    ftl::SmallMap<int, std::string, 3> map;
    EXPECT_TRUE(map.empty());
    EXPECT_FALSE(map.dynamic());

    map = ftl::init::map<int, std::string>(123, "abc")(-1)(42, 3u, '?');
    EXPECT_EQ(map.size(), 3u);
    EXPECT_FALSE(map.dynamic());

    EXPECT_TRUE(map.contains(123));

    EXPECT_EQ(map.find(42, [](const std::string& s) { return s.size(); }), 3u);

    const auto opt = map.find(-1);
    ASSERT_TRUE(opt);

    std::string& ref = *opt;
    EXPECT_TRUE(ref.empty());
    ref = "xyz";

    EXPECT_EQ(map, SmallMap(ftl::init::map(-1, "xyz")(42, "???")(123, "abc")));
}

TEST(SmallMap, Construct) {
    {
        // Default constructor.
        SmallMap<int, std::string, 2> map;

        EXPECT_TRUE(map.empty());
        EXPECT_FALSE(map.dynamic());
    }
    {
        // In-place constructor with same types.
        SmallMap<int, std::string, 5> map =
                ftl::init::map<int, std::string>(123, "abc")(456, "def")(789, "ghi");

        EXPECT_EQ(map.size(), 3u);
        EXPECT_EQ(map.max_size(), 5u);
        EXPECT_FALSE(map.dynamic());

        EXPECT_EQ(map, SmallMap(ftl::init::map(123, "abc")(456, "def")(789, "ghi")));
    }
    {
        // In-place constructor with different types.
        SmallMap<int, std::string, 5> map =
                ftl::init::map<int, std::string>(123, "abc")(-1)(42, 3u, '?');

        EXPECT_EQ(map.size(), 3u);
        EXPECT_EQ(map.max_size(), 5u);
        EXPECT_FALSE(map.dynamic());

        EXPECT_EQ(map, SmallMap(ftl::init::map(42, "???")(123, "abc")(-1, "\0\0\0")));
    }
    {
        // In-place constructor with implicit size.
        SmallMap map = ftl::init::map<int, std::string>(123, "abc")(-1)(42, 3u, '?');

        static_assert(std::is_same_v<decltype(map), SmallMap<int, std::string, 3>>);
        EXPECT_EQ(map.size(), 3u);
        EXPECT_EQ(map.max_size(), 3u);
        EXPECT_FALSE(map.dynamic());

        EXPECT_EQ(map, SmallMap(ftl::init::map(-1, "\0\0\0")(42, "???")(123, "abc")));
    }
}

TEST(SmallMap, Find) {
    {
        // Constant reference.
        const ftl::SmallMap map = ftl::init::map('a', 'A')('b', 'B')('c', 'C');

        const auto opt = map.find('b');
        EXPECT_EQ(opt, 'B');

        const char d = 'D';
        const auto ref = map.find('d').value_or(std::cref(d));
        EXPECT_EQ(ref.get(), 'D');
    }
    {
        // Mutable reference.
        ftl::SmallMap map = ftl::init::map('a', 'A')('b', 'B')('c', 'C');

        const auto opt = map.find('c');
        EXPECT_EQ(opt, 'C');

        char d = 'd';
        const auto ref = map.find('d').value_or(std::ref(d));
        ref.get() = 'D';
        EXPECT_EQ(d, 'D');
    }
    {
        // Constant unary operation.
        const ftl::SmallMap map = ftl::init::map('a', 'x')('b', 'y')('c', 'z');
        EXPECT_EQ(map.find('c', [](char c) { return std::toupper(c); }), 'Z');
    }
    {
        // Mutable unary operation.
        ftl::SmallMap map = ftl::init::map('a', 'x')('b', 'y')('c', 'z');
        EXPECT_TRUE(map.find('c', [](char& c) { c = std::toupper(c); }));

        EXPECT_EQ(map, SmallMap(ftl::init::map('c', 'Z')('b', 'y')('a', 'x')));
    }
}

} // namespace android::test