remoting/base/typed_buffer_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 "remoting/base/typed_buffer.h"
   6 #include "testing/gtest/include/gtest/gtest.h"
   7
   8 namespace remoting {
   9
  10 namespace {
  11
  12 struct Data {
  13   // A variable size vector.
  14   int data[1];
  15 };
  16
  17 }  // namespace
  18
  19 // Check that the default constructor does not allocate the buffer.
  20 TEST(TypedBufferTest, Empty) {
  21   TypedBuffer<Data> buffer;
  22   EXPECT_FALSE(buffer.get());
  23   EXPECT_FALSE(buffer);
  24   EXPECT_EQ(buffer.length(), 0u);
  25 }
  26
  27 // Check that allocating zero-size structure does not allocate the buffer.
  28 TEST(TypedBufferTest, ZeroSize) {
  29   TypedBuffer<Data> buffer(0);
  30   EXPECT_FALSE(buffer.get());
  31   EXPECT_FALSE(buffer);
  32   EXPECT_EQ(buffer.length(), 0u);
  33 }
  34
  35 // Test creation of a buffer and verify that the buffer accessors work.
  36 TEST(TypedBufferTest, Basic) {
  37   TypedBuffer<Data> buffer(sizeof(int) * 10);
  38   EXPECT_TRUE(buffer.get());
  39   EXPECT_TRUE(buffer);
  40   EXPECT_EQ(buffer.length(), sizeof(int) * 10);
  41
  42   // Make sure that operator*() syntax works.
  43   (*buffer).data[9] = 0x12345678;
  44
  45   // Make sure that operator->() syntax works.
  46   EXPECT_EQ(buffer->data[9], 0x12345678);
  47 }
  48
  49 // Test passing ownership.
  50 TEST(TypedBufferTest, Pass) {
  51   TypedBuffer<Data> left;
  52   TypedBuffer<Data> right(sizeof(int));
  53
  54   EXPECT_FALSE(left.get());
  55   EXPECT_EQ(left.length(), 0u);
  56   EXPECT_TRUE(right.get());
  57   EXPECT_EQ(right.length(), sizeof(int));
  58
  59   Data* raw_ptr = right.get();
  60   left = right.Pass();
  61
  62   // Verify that passing ownership transfers both the buffer pointer and its
  63   // length.
  64   EXPECT_EQ(left.get(), raw_ptr);
  65   EXPECT_EQ(left.length(), sizeof(int));
  66
  67   // Verify that the original object was cleared.
  68   EXPECT_FALSE(right.get());
  69   EXPECT_EQ(right.length(), 0u);
  70 }
  71
  72 // Test swapping ownership.
  73 TEST(TypedBufferTest, Swap) {
  74   TypedBuffer<Data> left(sizeof(int));
  75   TypedBuffer<Data> right(sizeof(int) * 2);
  76
  77   EXPECT_TRUE(left.get());
  78   EXPECT_EQ(left.length(), sizeof(int));
  79   EXPECT_TRUE(right.get());
  80   EXPECT_EQ(right.length(), sizeof(int) * 2);
  81
  82   Data* raw_left = left.get();
  83   Data* raw_right = right.get();
  84   left.Swap(right);
  85
  86   // Verify that swapping simply exchange contents of two objects.
  87   // length.
  88   EXPECT_EQ(left.get(), raw_right);
  89   EXPECT_EQ(left.length(), sizeof(int) * 2);
  90   EXPECT_EQ(right.get(), raw_left);
  91   EXPECT_EQ(right.length(), sizeof(int));
  92 }
  93
  94 TEST(TypedBufferTest, GetAtOffset) {
  95   TypedBuffer<Data> buffer(sizeof(int) * 10);
  96   EXPECT_EQ(buffer.get(), buffer.GetAtOffset(0));
  97   EXPECT_EQ(reinterpret_cast<Data*>(&buffer->data[9]),
  98             buffer.GetAtOffset(sizeof(int) * 9));
  99 }
 100
 101 }  // namespace remoting