text: // Copyright (c) 2018, The BMNC Project based on The Monero Project
  //
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  // permitted provided that the following conditions are met:
  //
  // 1. Redistributions of source code must retain the above copyright notice, this list of
  //    conditions and the following disclaimer.
  //
  // 2. Redistributions in binary form must reproduce the above copyright notice, this list
  //    of conditions and the following disclaimer in the documentation and/or other
  //    materials provided with the distribution.
  //
  // 3. Neither the name of the copyright holder nor the names of its contributors may be
  //    used to endorse or promote products derived from this software without specific
  //    prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
  // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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  // THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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  // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  #include <cstdint>
  #include <gtest/gtest.h>
  #include <memory>
  #include <sstream>
  #include <string>
  
  #include "cryptonote_basic/cryptonote_basic_impl.h"
  
  namespace
  {
    static constexpr const std::uint8_t source[] = {
      0x8b, 0x65, 0x59, 0x70, 0x15, 0x37, 0x99, 0xaf, 0x2a, 0xea, 0xdc, 0x9f, 0xf1, 0xad, 0xd0, 0xea,
      0x6c, 0x72, 0x51, 0xd5, 0x41, 0x54, 0xcf, 0xa9, 0x2c, 0x17, 0x3a, 0x0d, 0xd3, 0x9c, 0x1f, 0x94,
      0x6c, 0x72, 0x51, 0xd5, 0x41, 0x54, 0xcf, 0xa9, 0x2c, 0x17, 0x3a, 0x0d, 0xd3, 0x9c, 0x1f, 0x94,
      0x8b, 0x65, 0x59, 0x70, 0x15, 0x37, 0x99, 0xaf, 0x2a, 0xea, 0xdc, 0x9f, 0xf1, 0xad, 0xd0, 0xea
    };
  
    static constexpr const char expected[] =
      "8b655970153799af2aeadc9ff1add0ea6c7251d54154cfa92c173a0dd39c1f94"
      "6c7251d54154cfa92c173a0dd39c1f948b655970153799af2aeadc9ff1add0ea";
  
    template<typename T>
    bool is_formatted()
    {
      T value{};
  
      static_assert(alignof(T) == 1, "T must have 1 byte alignment");
      static_assert(sizeof(T) <= sizeof(source), "T is too large for source");
      static_assert(sizeof(T) * 2 <= sizeof(expected), "T is too large for destination");
      std::memcpy(std::addressof(value), source, sizeof(T));
  
      std::stringstream out;
      out << "BEGIN" << value << "END";  
      return out.str() == "BEGIN<" + std::string{expected, sizeof(T) * 2} + ">END";
    }
  }
  
  TEST(Crypto, Ostream)
  {
    EXPECT_TRUE(is_formatted<crypto::hash8>());
    EXPECT_TRUE(is_formatted<crypto::hash>());
    EXPECT_TRUE(is_formatted<crypto::public_key>());
    EXPECT_TRUE(is_formatted<crypto::secret_key>());
    EXPECT_TRUE(is_formatted<crypto::signature>());
    EXPECT_TRUE(is_formatted<crypto::key_derivation>());
    EXPECT_TRUE(is_formatted<crypto::key_image>());
  }
  