src/tint/utils/map_test.cc

// Copyright 2021 The Tint Authors.
//
// 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 "src/tint/utils/map.h"

#include <unordered_map>

#include "gtest/gtest.h"

namespace tint::utils {
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(GetOrCreateTest, NewKey) {
  std::unordered_map<int, int> map;
  EXPECT_EQ(GetOrCreate(map, 1, [&] { return 2; }), 2);
  EXPECT_EQ(map.size(), 1u);
  EXPECT_EQ(map[1], 2);
}

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

}  // namespace
}  // namespace tint::utils