Method TestEmptyStream

cpp/src/arrow/io/memory_test.cc:521–532

  TransformInputStream::TransformFunc transform() const { return T(); }

  void TestEmptyStream() {
    std::shared_ptr<InputStream> wrapped = BufferReader::FromString({});
    auto stream = std::make_shared<TransformInputStream>(wrapped, transform());

    ASSERT_OK_AND_EQ(0, stream->Tell());
    ASSERT_OK_AND_ASSIGN(auto buf, stream->Read(123));
    ASSERT_EQ(buf->size(), 0);
    ASSERT_OK_AND_ASSIGN(buf, stream->Read(0));
    ASSERT_EQ(buf->size(), 0);
    ASSERT_OK_AND_EQ(0, stream->Read(5, out_data_));
    ASSERT_OK_AND_EQ(0, stream->Tell());
  }

  void TestBasics() {
    auto src = Buffer::FromString("1234567890abcdefghi");