src/tint/utils/containers/map_test.cc

// Copyright 2021 The Dawn & Tint Authors
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#include "src/tint/utils/containers/map.h"

#include <unordered_map>

#include "gtest/gtest.h"

namespace tint {
namespace {

TEST(Lookup, Test) {
    std::unordered_map<int, int> map;
    map.emplace(10, 1);
    EXPECT_EQ(Lookup(map, 10, 0), 1);    // exists, with if_missing
    EXPECT_EQ(Lookup(map, 10), 1);       // exists, without if_missing
    EXPECT_EQ(Lookup(map, 20, 50), 50);  // missing, with if_missing
    EXPECT_EQ(Lookup(map, 20), 0);       // missing, without if_missing
}

TEST(GetOrAddTest, NewKey) {
    std::unordered_map<int, int> map;
    EXPECT_EQ(GetOrAdd(map, 1, [&] { return 2; }), 2);
    EXPECT_EQ(map.size(), 1u);
    EXPECT_EQ(map[1], 2);
}

TEST(GetOrAddTest, ExistingKey) {
    std::unordered_map<int, int> map;
    map[1] = 2;
    bool called = false;
    EXPECT_EQ(GetOrAdd(map, 1,
                       [&] {
                           called = true;
                           return -2;
                       }),
              2);
    EXPECT_EQ(called, false);
    EXPECT_EQ(map.size(), 1u);
    EXPECT_EQ(map[1], 2);
}

}  // namespace
}  // namespace tint