src/google/protobuf/arenastring_unittest.cc

// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
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// Based on mvels@'s frankenstring.

#include <google/protobuf/arenastring.h>

#include <algorithm>
#include <cstdlib>
#include <memory>
#include <string>
#include <vector>

#include <google/protobuf/stubs/logging.h>
#include <google/protobuf/stubs/common.h>
#include <google/protobuf/io/coded_stream.h>
#include <google/protobuf/io/zero_copy_stream_impl.h>
#include <gtest/gtest.h>


namespace google {
namespace protobuf {

using internal::ArenaStringPtr;


static std::string WrapString(const char* value) { return value; }

// Test ArenaStringPtr with arena == NULL.
TEST(ArenaStringPtrTest, ArenaStringPtrOnHeap) {
  ArenaStringPtr field;
  std::string default_value = "default";
  field.UnsafeSetDefault(&default_value);
  EXPECT_EQ(std::string("default"), field.Get());
  field.Set(&default_value, WrapString("Test short"), NULL);
  EXPECT_EQ(std::string("Test short"), field.Get());
  field.Set(&default_value, WrapString("Test long long long long value"), NULL);
  EXPECT_EQ(std::string("Test long long long long value"), field.Get());
  field.Set(&default_value, std::string(""), NULL);
  field.Destroy(&default_value, NULL);

  ArenaStringPtr field2;
  field2.UnsafeSetDefault(&default_value);
  std::string* mut = field2.Mutable(&default_value, NULL);
  EXPECT_EQ(mut, field2.Mutable(&default_value, NULL));
  EXPECT_EQ(mut, &field2.Get());
  EXPECT_NE(&default_value, mut);
  EXPECT_EQ(std::string("default"), *mut);
  *mut = "Test long long long long value";  // ensure string allocates storage
  EXPECT_EQ(std::string("Test long long long long value"), field2.Get());
  field2.Destroy(&default_value, NULL);
}

TEST(ArenaStringPtrTest, ArenaStringPtrOnArena) {
  Arena arena;
  ArenaStringPtr field;
  std::string default_value = "default";
  field.UnsafeSetDefault(&default_value);
  EXPECT_EQ(std::string("default"), field.Get());
  field.Set(&default_value, WrapString("Test short"), &arena);
  EXPECT_EQ(std::string("Test short"), field.Get());
  field.Set(&default_value, WrapString("Test long long long long value"),
            &arena);
  EXPECT_EQ(std::string("Test long long long long value"), field.Get());
  field.Set(&default_value, std::string(""), &arena);
  field.Destroy(&default_value, &arena);

  ArenaStringPtr field2;
  field2.UnsafeSetDefault(&default_value);
  std::string* mut = field2.Mutable(&default_value, &arena);
  EXPECT_EQ(mut, field2.Mutable(&default_value, &arena));
  EXPECT_EQ(mut, &field2.Get());
  EXPECT_NE(&default_value, mut);
  EXPECT_EQ(std::string("default"), *mut);
  *mut = "Test long long long long value";  // ensure string allocates storage
  EXPECT_EQ(std::string("Test long long long long value"), field2.Get());
  field2.Destroy(&default_value, &arena);
}

TEST(ArenaStringPtrTest, ArenaStringPtrOnArenaNoSSO) {
  Arena arena;
  ArenaStringPtr field;
  std::string default_value = "default";
  field.UnsafeSetDefault(&default_value);
  EXPECT_EQ(std::string("default"), field.Get());

  // Avoid triggering the SSO optimization by setting the string to something
  // larger than the internal buffer.
  field.Set(&default_value, WrapString("Test long long long long value"),
            &arena);
  EXPECT_EQ(std::string("Test long long long long value"), field.Get());
  field.Set(&default_value, std::string(""), &arena);
  field.Destroy(&default_value, &arena);

  ArenaStringPtr field2;
  field2.UnsafeSetDefault(&default_value);
  std::string* mut = field2.Mutable(&default_value, &arena);
  EXPECT_EQ(mut, field2.Mutable(&default_value, &arena));
  EXPECT_EQ(mut, &field2.Get());
  EXPECT_NE(&default_value, mut);
  EXPECT_EQ(std::string("default"), *mut);
  *mut = "Test long long long long value";  // ensure string allocates storage
  EXPECT_EQ(std::string("Test long long long long value"), field2.Get());
  field2.Destroy(&default_value, &arena);
}


}  // namespace protobuf
}  // namespace google