text: // Copyright (c) 2014-2018, The Cred Project
  // 
  // All rights reserved.
  // 
  // Redistribution and use in source and binary forms, with or without modification, are
  // 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
  // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
  // THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  // STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
  // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  // FIXME: move this into a full wallet2 unit test suite, if possible
  
  #include "gtest/gtest.h"
  
  #include "wallet/wallet2.h"
  
  static crypto::hash make_hash(uint64_t n)
  {
    union
    {
      crypto::hash hash;
      uint64_t n;
    } hash;
    hash.hash = crypto::null_hash;
    hash.n = n;
    return hash.hash;
  }
  
  TEST(hashchain, empty)
  {
    tools::hashchain hashchain;
    ASSERT_EQ(hashchain.size(), 0);
    ASSERT_EQ(hashchain.offset(), 0);
  }
  
  TEST(hashchain, genesis)
  {
    tools::hashchain hashchain;
    hashchain.push_back(make_hash(1));
    ASSERT_EQ(hashchain.size(), 1);
    ASSERT_EQ(hashchain.genesis(), make_hash(1));
    hashchain.push_back(make_hash(2));
    ASSERT_EQ(hashchain.size(), 2);
    ASSERT_EQ(hashchain.genesis(), make_hash(1));
  }
  
  TEST(hashchain, push_back)
  {
    tools::hashchain hashchain;
    hashchain.push_back(make_hash(1));
    hashchain.push_back(make_hash(2));
    hashchain.push_back(make_hash(3));
    ASSERT_EQ(hashchain[0], make_hash(1));
    ASSERT_EQ(hashchain[1], make_hash(2));
    ASSERT_EQ(hashchain[2], make_hash(3));
  }
  
  TEST(hashchain, clear_empty)
  {
    tools::hashchain hashchain;
    ASSERT_TRUE(hashchain.empty());
    hashchain.push_back(make_hash(1));
    ASSERT_FALSE(hashchain.empty());
    hashchain.push_back(make_hash(2));
    ASSERT_FALSE(hashchain.empty());
    hashchain.clear();
    ASSERT_TRUE(hashchain.empty());
  }
  
  TEST(hashchain, crop)
  {
    tools::hashchain hashchain;
    hashchain.push_back(make_hash(1));
    hashchain.push_back(make_hash(2));
    hashchain.push_back(make_hash(3));
    ASSERT_EQ(hashchain.size(), 3);
    ASSERT_EQ(hashchain[0], make_hash(1));
    ASSERT_EQ(hashchain[1], make_hash(2));
    ASSERT_EQ(hashchain[2], make_hash(3));
    hashchain.crop(3);
    ASSERT_EQ(hashchain.size(), 3);
    hashchain.crop(2);
    ASSERT_EQ(hashchain.size(), 2);
    ASSERT_EQ(hashchain[0], make_hash(1));
    ASSERT_EQ(hashchain[1], make_hash(2));
    ASSERT_EQ(hashchain.genesis(), make_hash(1));
    hashchain.crop(0);
    ASSERT_TRUE(hashchain.empty());
    ASSERT_EQ(hashchain.size(), 0);
    hashchain.push_back(make_hash(5));
    ASSERT_EQ(hashchain.genesis(), make_hash(5));
    ASSERT_EQ(hashchain.size(), 1);
  }
  
  TEST(hashchain, trim)
  {
    tools::hashchain hashchain;
    hashchain.push_back(make_hash(1));
    hashchain.push_back(make_hash(2));
    hashchain.push_back(make_hash(3));
    ASSERT_EQ(hashchain.offset(), 0);
    hashchain.trim(2);
    ASSERT_EQ(hashchain.offset(), 2);
    ASSERT_EQ(hashchain.size(), 3);
    ASSERT_EQ(hashchain[2], make_hash(3));
    hashchain.trim(3);
    ASSERT_EQ(hashchain.offset(), 2); // never gets it empty
    ASSERT_EQ(hashchain.size(), 3);
    ASSERT_FALSE(hashchain.empty());
    ASSERT_EQ(hashchain.genesis(), make_hash(1));
  }
  