ui/base/models/list_model_unittest.cc

   1 // Copyright (c) 2012 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 "ui/base/models/list_model.h"
   6
   7 #include "base/basictypes.h"
   8 #include "base/compiler_specific.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "testing/gtest/include/gtest/gtest.h"
  11
  12 namespace ui {
  13
  14 class FooItem {
  15  public:
  16   explicit FooItem(int id) : id_(id) {}
  17
  18   int id() const { return id_; }
  19
  20  private:
  21   int id_;
  22   DISALLOW_COPY_AND_ASSIGN(FooItem);
  23 };
  24
  25 class ListModelTest : public testing::Test,
  26                       public ListModelObserver {
  27  public:
  28   ListModelTest()
  29       : added_count_(0),
  30         removed_count_(0),
  31         moved_count_(0),
  32         changed_count_(0) {
  33   }
  34
  35   void ExpectCountsEqual(size_t added_count,
  36                          size_t removed_count,
  37                          size_t moved_count,
  38                          size_t changed_count) {
  39     EXPECT_EQ(added_count, added_count_);
  40     EXPECT_EQ(removed_count, removed_count_);
  41     EXPECT_EQ(moved_count, moved_count_);
  42     EXPECT_EQ(changed_count, changed_count_);
  43   }
  44
  45   void ClearCounts() {
  46     added_count_ = removed_count_ = moved_count_ = changed_count_ = 0;
  47   }
  48
  49   // ListModelObserver implementation:
  50   void ListItemsAdded(size_t start, size_t count) override {
  51     added_count_ += count;
  52   }
  53   void ListItemsRemoved(size_t start, size_t count) override {
  54     removed_count_ += count;
  55   }
  56   void ListItemMoved(size_t index, size_t target_index) override {
  57     ++moved_count_;
  58   }
  59   void ListItemsChanged(size_t start, size_t count) override {
  60     changed_count_ += count;
  61   }
  62
  63  private:
  64   size_t added_count_;
  65   size_t removed_count_;
  66   size_t moved_count_;
  67   size_t changed_count_;
  68
  69   DISALLOW_COPY_AND_ASSIGN(ListModelTest);
  70 };
  71
  72 TEST_F(ListModelTest, Add) {
  73   ListModel<FooItem> model;
  74   model.AddObserver(this);
  75
  76   // Append FooItem(0)
  77   model.Add(new FooItem(0));
  78   ExpectCountsEqual(1, 0, 0, 0);
  79
  80   // Append FooItem(1)
  81   model.Add(new FooItem(1));
  82   ExpectCountsEqual(2, 0, 0, 0);
  83
  84   // Insert FooItem(2) at position 0
  85   model.AddAt(0, new FooItem(2));
  86   ExpectCountsEqual(3, 0, 0, 0);
  87
  88   // Total 3 items in model.
  89   EXPECT_EQ(3U, model.item_count());
  90
  91   // First one should be FooItem(2), followed by FooItem(0) and FooItem(1)
  92   EXPECT_EQ(2, model.GetItemAt(0)->id());
  93   EXPECT_EQ(0, model.GetItemAt(1)->id());
  94   EXPECT_EQ(1, model.GetItemAt(2)->id());
  95 }
  96
  97 TEST_F(ListModelTest, Remove) {
  98   ListModel<FooItem> model;
  99   model.AddObserver(this);
 100
 101   model.Add(new FooItem(0));
 102   model.Add(new FooItem(1));
 103   model.Add(new FooItem(2));
 104
 105   ClearCounts();
 106
 107   // Remove item at index 1 from model and release memory.
 108   model.DeleteAt(1);
 109   ExpectCountsEqual(0, 1, 0, 0);
 110
 111   EXPECT_EQ(2U, model.item_count());
 112   EXPECT_EQ(0, model.GetItemAt(0)->id());
 113   EXPECT_EQ(2, model.GetItemAt(1)->id());
 114
 115   // Remove all items from model and delete them.
 116   model.DeleteAll();
 117   ExpectCountsEqual(0, 3, 0, 0);
 118 }
 119
 120 TEST_F(ListModelTest, RemoveAll) {
 121   ListModel<FooItem> model;
 122   model.AddObserver(this);
 123
 124   scoped_ptr<FooItem> foo0(new FooItem(0));
 125   scoped_ptr<FooItem> foo1(new FooItem(1));
 126   scoped_ptr<FooItem> foo2(new FooItem(2));
 127
 128   model.Add(foo0.get());
 129   model.Add(foo1.get());
 130   model.Add(foo2.get());
 131
 132   ClearCounts();
 133
 134   // Remove all items and scoped_ptr above would release memory.
 135   model.RemoveAll();
 136   ExpectCountsEqual(0, 3, 0, 0);
 137 }
 138
 139 TEST_F(ListModelTest, Move) {
 140   ListModel<FooItem> model;
 141   model.AddObserver(this);
 142
 143   model.Add(new FooItem(0));
 144   model.Add(new FooItem(1));
 145   model.Add(new FooItem(2));
 146
 147   ClearCounts();
 148
 149   // Moves item at index 0 to index 2.
 150   model.Move(0, 2);
 151   ExpectCountsEqual(0, 0, 1, 0);
 152   EXPECT_EQ(1, model.GetItemAt(0)->id());
 153   EXPECT_EQ(2, model.GetItemAt(1)->id());
 154   EXPECT_EQ(0, model.GetItemAt(2)->id());
 155 }
 156
 157 TEST_F(ListModelTest, FakeUpdate) {
 158   ListModel<FooItem> model;
 159   model.AddObserver(this);
 160
 161   model.Add(new FooItem(0));
 162   model.Add(new FooItem(1));
 163   model.Add(new FooItem(2));
 164
 165   ClearCounts();
 166
 167   model.NotifyItemsChanged(0, 1);
 168   ExpectCountsEqual(0, 0, 0, 1);
 169
 170   model.NotifyItemsChanged(1, 2);
 171   ExpectCountsEqual(0, 0, 0, 3);
 172 }
 173
 174 }  // namespace ui