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#include "base/container/flat_map.h"

#include <functional>

#include "absl/strings/string_view.h"
#include "testing/gmock.h"
#include "testing/gunit.h"

namespace mozc {
namespace {

using ::testing::Eq;
using ::testing::IsNull;
using ::testing::Pointee;

TEST(FlatMapTest, FindOrNull) {
  constexpr auto kMap = CreateFlatMap<int, absl::string_view>({
      {1, "one"},
      {3, "three"},
      {5, "five"},
  });

  EXPECT_THAT(kMap.FindOrNull(0), IsNull());
  EXPECT_THAT(kMap.FindOrNull(1), Pointee(Eq("one")));
  EXPECT_THAT(kMap.FindOrNull(2), IsNull());
  EXPECT_THAT(kMap.FindOrNull(3), Pointee(Eq("three")));
  EXPECT_THAT(kMap.FindOrNull(4), IsNull());
  EXPECT_THAT(kMap.FindOrNull(5), Pointee(Eq("five")));
  EXPECT_THAT(kMap.FindOrNull(6), IsNull());
}

TEST(FlatMapTest, CustomCompare) {
  constexpr auto kMap = CreateFlatMap<int, absl::string_view, std::greater<>>({
      {1, "one"},
      {3, "three"},
      {5, "five"},
  });

  EXPECT_THAT(kMap.FindOrNull(0), IsNull());
  EXPECT_THAT(kMap.FindOrNull(1), Pointee(Eq("one")));
  EXPECT_THAT(kMap.FindOrNull(2), IsNull());
  EXPECT_THAT(kMap.FindOrNull(3), Pointee(Eq("three")));
  EXPECT_THAT(kMap.FindOrNull(4), IsNull());
  EXPECT_THAT(kMap.FindOrNull(5), Pointee(Eq("five")));
  EXPECT_THAT(kMap.FindOrNull(6), IsNull());
}

}  // namespace
}  // namespace mozc
