python/cc/input_stream_adapter_test.cc

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
///////////////////////////////////////////////////////////////////////////////

#include "tink/python/cc/input_stream_adapter.h"

#include <algorithm>
#include <sstream>

#include "gtest/gtest.h"
#include "absl/memory/memory.h"
#include "tink/input_stream.h"
#include "tink/subtle/random.h"
#include "tink/util/istream_input_stream.h"
#include "tink/util/test_matchers.h"

using crypto::tink::test::IsOk;
using crypto::tink::test::StatusIs;

namespace crypto {
namespace tink {
namespace {

std::unique_ptr<InputStreamAdapter> GetInputStreamAdapter(
    int buffer_size, const std::string& data) {
  auto string_stream = absl::make_unique<std::stringstream>();
  string_stream->write(data.data(), data.size());
  auto input_stream = absl::make_unique<util::IstreamInputStream>(
      std::move(string_stream), buffer_size);
  return absl::make_unique<InputStreamAdapter>(std::move(input_stream));
}

TEST(InputStreamAdapterTest, BasicRead) {
  std::string data = subtle::Random::GetRandomBytes(10);
  auto adapter = GetInputStreamAdapter(-1, data);
  auto read_result = adapter->Read(10);
  ASSERT_THAT(read_result.status(), IsOk());
  EXPECT_EQ(read_result.ValueOrDie(), data);
}

TEST(InputStreamAdapterTest, ReadEOFError) {
  std::string data = subtle::Random::GetRandomBytes(10);
  auto adapter = GetInputStreamAdapter(-1, data);
  auto read_result = adapter->Read(10);
  ASSERT_THAT(read_result.status(), IsOk());
  EXPECT_EQ(read_result.ValueOrDie(), data);
  read_result = adapter->Read(10);
  EXPECT_THAT(read_result.status(), StatusIs(util::error::OUT_OF_RANGE));
}

TEST(InputStreamAdapterTest, MultipleRead) {
  std::string data = subtle::Random::GetRandomBytes(15);
  auto adapter = GetInputStreamAdapter(-1, data);
  auto read_result = adapter->Read(5);
  ASSERT_THAT(read_result.status(), IsOk());
  EXPECT_EQ(read_result.ValueOrDie(), data.substr(0, 5));
  read_result = adapter->Read(5);
  ASSERT_THAT(read_result.status(), IsOk());
  EXPECT_EQ(read_result.ValueOrDie(), data.substr(5, 5));
  read_result = adapter->Read(5);
  ASSERT_THAT(read_result.status(), IsOk());
  EXPECT_EQ(read_result.ValueOrDie(), data.substr(10, 5));
}

TEST(InputStreamAdapterTest, BasicRead1) {
  std::string data = subtle::Random::GetRandomBytes(10);
  auto adapter = GetInputStreamAdapter(-1, data);
  auto read_result = adapter->Read1(10);
  ASSERT_THAT(read_result.status(), IsOk());
  EXPECT_EQ(read_result.ValueOrDie(), data);
}

// In this test size of the IstreamInputStream buffer is smaller than the
// size of data to be read, so multiple calls to Next() will be needed.
TEST(InputStreamAdapterTest, MultipleNext) {
  std::string data = subtle::Random::GetRandomBytes(40);
  auto adapter = GetInputStreamAdapter(10, data);
  auto read_result = adapter->Read(35);
  ASSERT_THAT(read_result.status(), IsOk());
  EXPECT_EQ(read_result.ValueOrDie(), data.substr(0, 35));
}

TEST(InputStreamAdapterTest, ReadUntilEOF) {
  std::string data = subtle::Random::GetRandomBytes(35);
  auto adapter = GetInputStreamAdapter(10, data);
  auto read_result = adapter->Read(-1);
  ASSERT_THAT(read_result.status(), IsOk());
  EXPECT_EQ(read_result.ValueOrDie(), data);
}

TEST(InputStreamAdapterTest, ReadLessThanAvailable) {
  std::string data = subtle::Random::GetRandomBytes(20);
  auto adapter = GetInputStreamAdapter(-1, data);
  auto read_result = adapter->Read(10);
  ASSERT_THAT(read_result.status(), IsOk());
  EXPECT_EQ(read_result.ValueOrDie(), data.substr(0, 10));
}

TEST(InputStreamAdapterTest, ReadMoreThanAvailable) {
  std::string data = subtle::Random::GetRandomBytes(20);
  auto adapter = GetInputStreamAdapter(-1, data);
  auto read_result = adapter->Read(30);
  ASSERT_THAT(read_result.status(), IsOk());
  EXPECT_EQ(read_result.ValueOrDie(), data);
}

}  // namespace
}  // namespace tink
}  // namespace crypto