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// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "util/flat_map.h"
#include <chrono>
#include "absl/strings/string_view.h"
#include "gtest/gtest.h"
namespace openscreen {
namespace {
const FlatMap<int, absl::string_view> kSimpleFlatMap{{-1, "bar"},
{123, "foo"},
{10000, "baz"},
{0, ""}};
} // namespace
TEST(FlatMapTest, Find) {
EXPECT_EQ(kSimpleFlatMap.begin(), kSimpleFlatMap.find(-1));
EXPECT_EQ("bar", kSimpleFlatMap.find(-1)->second);
EXPECT_EQ("foo", kSimpleFlatMap.find(123)->second);
EXPECT_EQ("baz", kSimpleFlatMap.find(10000)->second);
EXPECT_EQ("", kSimpleFlatMap.find(0)->second);
EXPECT_EQ(kSimpleFlatMap.end(), kSimpleFlatMap.find(2));
}
// Since it is backed by a vector, we don't expose an operator[] due
// to potential confusion. If the type of Key is int or std::size_t, do
// you want the std::pair<Key, Value> or just the Value?
TEST(FlatMapTest, Access) {
EXPECT_EQ("bar", kSimpleFlatMap[0].second);
EXPECT_EQ("foo", kSimpleFlatMap[1].second);
EXPECT_EQ("baz", kSimpleFlatMap[2].second);
EXPECT_EQ("", kSimpleFlatMap[3].second);
// NOTE: vector doesn't do any range checking for operator[], only at().
EXPECT_EQ("bar", kSimpleFlatMap.at(0).second);
EXPECT_EQ("foo", kSimpleFlatMap.at(1).second);
EXPECT_EQ("baz", kSimpleFlatMap.at(2).second);
EXPECT_EQ("", kSimpleFlatMap.at(3).second);
// The error message varies widely depending on how the test is run.
// NOTE: Google Test doesn't support death tests on some platforms, such
// as iOS.
#if defined(GTEST_HAS_DEATH_TEST)
EXPECT_DEATH(kSimpleFlatMap.at(31337), ".*");
#endif
}
TEST(FlatMapTest, ErasureAndEmplacement) {
auto mutable_vector = kSimpleFlatMap;
EXPECT_NE(mutable_vector.find(-1), mutable_vector.end());
mutable_vector.erase_key(-1);
EXPECT_EQ(mutable_vector.find(-1), mutable_vector.end());
mutable_vector.emplace_back(-1, "bar");
EXPECT_NE(mutable_vector.find(-1), mutable_vector.end());
// We absolutely should fail to erase something that's not there.
#if defined(GTEST_HAS_DEATH_TEST)
EXPECT_DEATH(mutable_vector.erase_key(12345),
".*failed to erase: element not found.*");
#endif
}
TEST(FlatMapTest, Mutation) {
FlatMap<int, int> mutable_vector{{1, 2}};
EXPECT_EQ(2, mutable_vector[0].second);
mutable_vector[0].second = 3;
EXPECT_EQ(3, mutable_vector[0].second);
}
TEST(FlatMapTest, GenerallyBehavesLikeAVector) {
EXPECT_EQ(kSimpleFlatMap, kSimpleFlatMap);
EXPECT_TRUE(kSimpleFlatMap == kSimpleFlatMap);
for (auto& entry : kSimpleFlatMap) {
if (entry.first != 0) {
EXPECT_LT(0u, entry.second.size());
}
}
FlatMap<int, int> simple;
simple.emplace_back(1, 10);
EXPECT_EQ(simple, (FlatMap<int, int>{{1, 10}}));
auto it = simple.find(1);
ASSERT_NE(it, simple.end());
simple.erase(it);
EXPECT_EQ(simple.find(1), simple.end());
}
TEST(FlatMapTest, CanUseNonDefaultConstructibleThings) {
class NonDefaultConstructible {
public:
NonDefaultConstructible(int x, int y) : x_(x), y_(y) {}
int x() { return x_; }
int y() { return y_; }
private:
int x_;
int y_;
};
FlatMap<int, NonDefaultConstructible> flat_map;
flat_map.emplace_back(3, NonDefaultConstructible(2, 3));
auto it = flat_map.find(3);
ASSERT_TRUE(it != flat_map.end());
EXPECT_GT(it->second.y(), it->second.x());
}
} // namespace openscreen
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