1
    2
    3
    4
    5
    6
    7
    8
    9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89
   90
   91
   92
   93
   94
   95
   96
   97
   98
   99
  100
  101
  102
  103
  104
  105
  106
  107
  108
  109
  110
  111
  112
  113
  114
  115
  116
  117
  118
  119
  120
  121
  122
  123
  124
  125
  126
  127
  128
  129
  130
  131
  132
  133
  134
  135
  136
  137
  138
  139
  140
  141
  142
  143
  144
  145
  146
  147
  148
  149
  150
  151
  152


base / types / id_type_unittest.cc [blame]

// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/types/id_type.h"

#include <limits>
#include <unordered_map>

#include "testing/gtest/include/gtest/gtest.h"

namespace base {

namespace {

class Foo;
using FooId = IdType<Foo, int, 0>;

// A type that uses both 0 and -1 as invalid values.
using MultipleInvalidId = IdType<class MultipleInvalid, int, 0, 1, -1>;

}  // namespace

TEST(IdType, DefaultValueIsInvalid) {
  FooId foo_id;
  EXPECT_TRUE(foo_id.is_null());

  MultipleInvalidId multi_id;
  EXPECT_TRUE(multi_id.is_null());
}

TEST(IdType, NormalValueIsValid) {
  FooId foo_id = FooId::FromUnsafeValue(123);
  EXPECT_FALSE(foo_id.is_null());

  MultipleInvalidId multi_id = MultipleInvalidId::FromUnsafeValue(123);
  EXPECT_FALSE(multi_id.is_null());
}

TEST(IdType, ExtraInvalidValue) {
  MultipleInvalidId multi_id = MultipleInvalidId::FromUnsafeValue(-1);
  EXPECT_TRUE(multi_id.is_null());
}

TEST(IdType, Generator) {
  FooId::Generator foo_id_generator;
  for (int i = 1; i < 10; i++)
    EXPECT_EQ(foo_id_generator.GenerateNextId(), FooId::FromUnsafeValue(i));
}

TEST(IdType, GeneratorWithNonZeroInvalidValue) {
  using TestId = IdType<class TestIdTag, int, -1>;

  TestId::Generator test_id_generator;
  for (int i = 0; i < 10; i++)
    EXPECT_EQ(test_id_generator.GenerateNextId(), TestId::FromUnsafeValue(i));
}

TEST(IdType, GeneratorWithBigUnsignedInvalidValue) {
  using TestId =
      IdType<class TestIdTag, uint32_t, std::numeric_limits<uint32_t>::max()>;

  TestId::Generator test_id_generator;
  for (int i = 0; i < 10; i++) {
    TestId id = test_id_generator.GenerateNextId();
    EXPECT_FALSE(id.is_null());
    EXPECT_EQ(id, TestId::FromUnsafeValue(i));
  }
}

TEST(IdType, GeneratorWithDifferentStartingValue) {
  using TestId = IdType<class TestIdTag, int, -1, 1>;

  TestId::Generator test_id_generator;
  for (int i = 1; i < 10; i++)
    EXPECT_EQ(test_id_generator.GenerateNextId(), TestId::FromUnsafeValue(i));
}

TEST(IdType, EnsureConstexpr) {
  using TestId = IdType32<class TestTag>;

  // Test constructors.
  static constexpr TestId kZero;
  static constexpr auto kOne = TestId::FromUnsafeValue(1);

  // Test getting the underlying value.
  static_assert(kZero.value() == 0, "");
  static_assert(kOne.value() == 1, "");
  static_assert(kZero.GetUnsafeValue() == 0, "");
  static_assert(kOne.GetUnsafeValue() == 1, "");

  static constexpr MultipleInvalidId kMultiZero;
  static constexpr auto kMultiNegative = MultipleInvalidId::FromUnsafeValue(-1);
  static constexpr auto kMultiOne = MultipleInvalidId::FromUnsafeValue(1);

  // Test is_null().
  static_assert(kZero.is_null(), "");
  static_assert(!kOne.is_null(), "");
  static_assert(kMultiZero.is_null(), "");
  static_assert(kMultiNegative.is_null(), "");
  static_assert(!kMultiOne.is_null(), "");

  // Test operator bool.
  static_assert(!kZero, "");
  static_assert(kOne, "");
  static_assert(!kMultiZero, "");
  static_assert(!kMultiNegative, "");
  static_assert(kMultiOne, "");
}

TEST(IdType, Map) {
  struct TestObject {};
  using TestId = IdType32<class MapTestTag>;
  TestId::Generator id_generator;
  std::unordered_map<TestId, TestObject> map;

  TestObject obj[5];

  for (auto& i : obj) {
    map[id_generator.GenerateNextId()] = i;
  }
}

class IdTypeSpecificValueTest : public ::testing::TestWithParam<int> {
 protected:
  FooId test_id() { return FooId::FromUnsafeValue(GetParam()); }

  FooId other_id() {
    if (GetParam() != std::numeric_limits<int>::max())
      return FooId::FromUnsafeValue(GetParam() + 1);
    else
      return FooId::FromUnsafeValue(std::numeric_limits<int>::min());
  }
};

TEST_P(IdTypeSpecificValueTest, UnsafeValueRoundtrips) {
  int original_value = GetParam();
  FooId id = FooId::FromUnsafeValue(original_value);
  int final_value = id.GetUnsafeValue();
  EXPECT_EQ(original_value, final_value);
}

INSTANTIATE_TEST_SUITE_P(All,
                         IdTypeSpecificValueTest,
                         ::testing::Values(std::numeric_limits<int>::min(),
                                           -1,
                                           0,
                                           1,
                                           123,
                                           std::numeric_limits<int>::max()));

}  // namespace base