third_party/WebKit/Source/wtf/OptionalTest.cpp

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "config.h"
   6 #include "wtf/Optional.h"
   7
   8 #include <gtest/gtest.h>
   9
  10 namespace WTF {
  11 namespace {
  12
  13 struct IntBox {
  14     IntBox(int n) : number(n) { }
  15     int number;
  16 };
  17
  18 class DestructionNotifier {
  19 public:
  20     DestructionNotifier(bool& flag) : m_flag(flag) { }
  21     ~DestructionNotifier() { m_flag = true; }
  22 private:
  23     bool& m_flag;
  24 };
  25
  26 TEST(OptionalTest, BooleanTest)
  27 {
  28     Optional<int> optional;
  29     EXPECT_FALSE(optional);
  30     optional.emplace(0);
  31     EXPECT_TRUE(optional);
  32 }
  33
  34 TEST(OptionalTest, Dereference)
  35 {
  36     Optional<int> optional;
  37     optional.emplace(1);
  38     EXPECT_EQ(1, *optional);
  39
  40     Optional<IntBox> optionalIntbox;
  41     optionalIntbox.emplace(42);
  42     EXPECT_EQ(42, optionalIntbox->number);
  43 }
  44
  45 TEST(OptionalTest, DestructorCalled)
  46 {
  47     // Destroying a disengaged optional shouldn't do anything.
  48     {
  49         Optional<DestructionNotifier> optional;
  50     }
  51
  52     // Destroying an engaged optional should call the destructor.
  53     bool isDestroyed = false;
  54     {
  55         Optional<DestructionNotifier> optional;
  56         optional.emplace(isDestroyed);
  57         EXPECT_FALSE(isDestroyed);
  58     }
  59     EXPECT_TRUE(isDestroyed);
  60 }
  61
  62 } // namespace
  63 } // namespace WTF