webkit/dom_storage/dom_storage_map_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 "base/utf_string_conversions.h"
   6 #include "testing/gtest/include/gtest/gtest.h"
   7 #include "webkit/dom_storage/dom_storage_map.h"
   8
   9 namespace dom_storage {
  10
  11 TEST(DomStorageMapTest, DomStorageMapBasics) {
  12   const base::string16 kKey(ASCIIToUTF16("key"));
  13   const base::string16 kValue(ASCIIToUTF16("value"));
  14   const size_t kValueBytes = kValue.size() * sizeof(char16);
  15   const size_t kItemBytes =
  16       (kKey.size() + kValue.size()) * sizeof(char16);
  17   const base::string16 kKey2(ASCIIToUTF16("key2"));
  18   const size_t kKey2Bytes = kKey2.size() * sizeof(char16);
  19   const base::string16 kValue2(ASCIIToUTF16("value2"));
  20   const size_t kItem2Bytes =
  21       (kKey2.size() + kValue2.size()) * sizeof(char16);
  22   const size_t kQuota = 1024;  // 1K quota for this test.
  23
  24   scoped_refptr<DomStorageMap> map(new DomStorageMap(kQuota));
  25   base::string16 old_value;
  26   NullableString16 old_nullable_value;
  27   ValuesMap swap;
  28   scoped_refptr<DomStorageMap> copy;
  29
  30   // Check the behavior of an empty map.
  31   EXPECT_EQ(0u, map->Length());
  32   EXPECT_TRUE(map->Key(0).is_null());
  33   EXPECT_TRUE(map->Key(100).is_null());
  34   EXPECT_TRUE(map->GetItem(kKey).is_null());
  35   EXPECT_FALSE(map->RemoveItem(kKey, &old_value));
  36   EXPECT_EQ(0u, map->bytes_used());
  37   copy = map->DeepCopy();
  38   EXPECT_EQ(0u, copy->Length());
  39   EXPECT_EQ(0u, copy->bytes_used());
  40   map->SwapValues(&swap);
  41   EXPECT_TRUE(swap.empty());
  42
  43   // Check the behavior of a map containing some values.
  44   EXPECT_TRUE(map->SetItem(kKey, kValue, &old_nullable_value));
  45   EXPECT_TRUE(old_nullable_value.is_null());
  46   EXPECT_EQ(1u, map->Length());
  47   EXPECT_EQ(kKey, map->Key(0).string());
  48   EXPECT_TRUE(map->Key(1).is_null());
  49   EXPECT_EQ(kValue, map->GetItem(kKey).string());
  50   EXPECT_TRUE(map->GetItem(kKey2).is_null());
  51   EXPECT_EQ(kItemBytes, map->bytes_used());
  52   EXPECT_TRUE(map->RemoveItem(kKey, &old_value));
  53   EXPECT_EQ(0u, map->bytes_used());
  54   EXPECT_EQ(kValue, old_value);
  55   old_value.clear();
  56
  57   EXPECT_TRUE(map->SetItem(kKey, kValue, &old_nullable_value));
  58   EXPECT_TRUE(map->SetItem(kKey2, kValue, &old_nullable_value));
  59   EXPECT_TRUE(old_nullable_value.is_null());
  60   EXPECT_EQ(kItemBytes + kKey2Bytes + kValueBytes, map->bytes_used());
  61   EXPECT_TRUE(map->SetItem(kKey2, kValue2, &old_nullable_value));
  62   EXPECT_EQ(kItemBytes + kItem2Bytes, map->bytes_used());
  63   EXPECT_EQ(kValue, old_nullable_value.string());
  64   EXPECT_EQ(2u, map->Length());
  65   EXPECT_EQ(kKey, map->Key(0).string());
  66   EXPECT_EQ(kKey2, map->Key(1).string());
  67   EXPECT_EQ(kKey, map->Key(0).string());
  68   EXPECT_EQ(kItemBytes + kItem2Bytes, map->bytes_used());
  69
  70   copy = map->DeepCopy();
  71   EXPECT_EQ(2u, copy->Length());
  72   EXPECT_EQ(kValue, copy->GetItem(kKey).string());
  73   EXPECT_EQ(kValue2, copy->GetItem(kKey2).string());
  74   EXPECT_EQ(kKey, copy->Key(0).string());
  75   EXPECT_EQ(kKey2, copy->Key(1).string());
  76   EXPECT_TRUE(copy->Key(2).is_null());
  77   EXPECT_EQ(kItemBytes + kItem2Bytes, copy->bytes_used());
  78
  79   map->SwapValues(&swap);
  80   EXPECT_EQ(2ul, swap.size());
  81   EXPECT_EQ(0u, map->Length());
  82   EXPECT_EQ(0u, map->bytes_used());
  83 }
  84
  85 TEST(DomStorageMapTest, EnforcesQuota) {
  86   const base::string16 kKey = ASCIIToUTF16("test_key");
  87   const base::string16 kValue = ASCIIToUTF16("test_value");
  88   const base::string16 kKey2 = ASCIIToUTF16("test_key_2");
  89
  90   // A 50 byte quota is too small to hold both keys, so we
  91   // should see the DomStorageMap enforcing it.
  92   const size_t kQuota = 50;
  93
  94   base::string16 old_value;
  95   NullableString16 old_nullable_value;
  96
  97   scoped_refptr<DomStorageMap> map(new DomStorageMap(kQuota));
  98   EXPECT_TRUE(map->SetItem(kKey, kValue, &old_nullable_value));
  99   EXPECT_FALSE(map->SetItem(kKey2, kValue, &old_nullable_value));
 100   EXPECT_EQ(1u, map->Length());
 101
 102   EXPECT_TRUE(map->RemoveItem(kKey, &old_value));
 103   EXPECT_EQ(kValue, old_value);
 104   EXPECT_EQ(0u, map->Length());
 105   EXPECT_TRUE(map->SetItem(kKey2, kValue, &old_nullable_value));
 106   EXPECT_EQ(1u, map->Length());
 107
 108   // Verify that the SwapValues method does not do quota checking.
 109   ValuesMap swap;
 110   swap[kKey] = NullableString16(kValue, false);
 111   swap[kKey2] = NullableString16(kValue, false);
 112   map->SwapValues(&swap);
 113   EXPECT_GT(map->bytes_used(), kQuota);
 114
 115   // When overbudget, a new value of greater size than the existing value can
 116   // not be set, but a new value of lesser or equal size can be set.
 117   EXPECT_TRUE(map->SetItem(kKey, kValue, &old_nullable_value));
 118   EXPECT_FALSE(map->SetItem(kKey, base::string16(kValue + kValue),
 119                             &old_nullable_value));
 120   EXPECT_TRUE(map->SetItem(kKey, base::string16(), &old_nullable_value));
 121   EXPECT_EQ(kValue, old_nullable_value.string());
 122 }
 123
 124 }  // namespace dom_storage