//
//  Copyright (C) 2023 David Cosgrove
//
//   @@ All Rights Reserved @@
//  This file is part of the RDKit.
//  The contents are covered by the terms of the BSD license
//  which is included in the file license.txt, found at the root
//  of the RDKit source tree.
//

#include <chrono>
#include <random>
#include <vector>

#include <GraphMol/MolOps.h>
#include <GraphMol/SmilesParse/SmilesParse.h>
#include <GraphMol/SmilesParse/SmilesWrite.h>
#include <GraphMol/Substruct/SubstructMatch.h>

#include <catch2/catch_all.hpp>

#include <GraphMol/RascalMCES/RascalMCES.h>
#include <GraphMol/RascalMCES/RascalOptions.h>
#include <GraphMol/RascalMCES/RascalResult.h>
#include <GraphMol/RascalMCES/RascalDetails.h>

// 'The paper' referenced below is :
// RASCAL: Calculation of Graph Similarity using Maximum Common
// Edge Subgraphs, John W. Raymond, Eleanor J. Gardiner, Peter Willett
// 'The Computer Journal', 45, 631-644 (2002).
// https://eprints.whiterose.ac.uk/3568/1/willets3.pdf

using namespace RDKit;
using namespace RDKit::RascalMCES;
using namespace RDKit::RascalMCES::details;

void check_smarts_ok(const RDKit::ROMol &mol1, const RDKit::ROMol &mol2,
                     const RascalResult &res) {
  auto qmol = v2::SmilesParse::MolFromSmarts(res.getSmarts());
  REQUIRE(qmol);
  RDKit::MatchVectType dont_care;
  CHECK(RDKit::SubstructMatch(mol1, *qmol, dont_care));
  CHECK(RDKit::SubstructMatch(mol2, *qmol, dont_care));
}

void check_expected_bonds(
    const RascalResult &res,
    const std::vector<std::vector<std::pair<int, int>>> &exp_bond_matches) {
  auto found_it = std::find(exp_bond_matches.begin(), exp_bond_matches.end(),
                            res.getBondMatches());
  CHECK(found_it != exp_bond_matches.end());
}

TEST_CASE("Very small test", "[basics]") {
  auto m1 = "OCC(=O)N"_smiles;
  REQUIRE(m1);
  auto m2 = "NC(=O)C=O"_smiles;
  REQUIRE(m2);

  RascalOptions opts;
  std::map<int, std::vector<std::pair<int, int>>> degSeqs1, degSeqs2;
  auto tier1_sim = tier1Sim(*m1, *m2, degSeqs1, degSeqs2);
  REQUIRE_THAT(tier1_sim, Catch::Matchers::WithinAbs(1.0000, 0.0001));

  std::vector<unsigned int> bondLabels1, bondLabels2;
  getBondLabels(*m1, *m2, opts, bondLabels1, bondLabels2);
  auto tier2_sim =
      tier2Sim(*m1, *m2, degSeqs1, degSeqs2, bondLabels1, bondLabels2);
  REQUIRE_THAT(tier2_sim, Catch::Matchers::WithinAbs(0.7901, 0.0001));

  auto res = rascalMCES(*m1, *m2, opts);

  REQUIRE(res.size() == 1);
  REQUIRE(res.front().getBondMatches().size() == 3);
  std::vector<std::pair<int, int>> exp_bond_matches{{1, 2}, {2, 1}, {3, 0}};
  REQUIRE(exp_bond_matches == res.front().getBondMatches());
  REQUIRE_THAT(res.front().getSimilarity(),
               Catch::Matchers::WithinAbs(0.6049, 0.0001));

  check_smarts_ok(*m1, *m2, res.front());
}

TEST_CASE("Default options", "[basics]") {
  auto m1 = "OCC(=O)N"_smiles;
  REQUIRE(m1);
  auto m2 = "NC(=O)C=O"_smiles;
  REQUIRE(m2);

  auto res = rascalMCES(*m1, *m2);

  REQUIRE(res.size() == 1);
  REQUIRE(res.front().getBondMatches().size() == 3);
  std::vector<std::pair<int, int>> exp_bond_matches{{1, 2}, {2, 1}, {3, 0}};
  REQUIRE(exp_bond_matches == res.front().getBondMatches());
  REQUIRE_THAT(res.front().getSimilarity(),
               Catch::Matchers::WithinAbs(0.6049, 0.0001));

  check_smarts_ok(*m1, *m2, res.front());
}

TEST_CASE("Juglone vs Scopoletin test", "[basics]") {
  auto m1 = "Oc1cccc2C(=O)C=CC(=O)c12"_smiles;
  REQUIRE(m1);
  auto m2 = "O1C(=O)C=Cc2cc(OC)c(O)cc12"_smiles;
  REQUIRE(m2);

  std::map<int, std::vector<std::pair<int, int>>> degSeqs1, degSeqs2;
  auto tier1_sim = tier1Sim(*m1, *m2, degSeqs1, degSeqs2);
  REQUIRE_THAT(tier1_sim, Catch::Matchers::WithinAbs(0.8633, 0.0001));

  RascalOptions opts;
  std::vector<unsigned int> bondLabels1, bondLabels2;
  getBondLabels(*m1, *m2, opts, bondLabels1, bondLabels2);
  auto tier2_sim =
      tier2Sim(*m1, *m2, degSeqs1, degSeqs2, bondLabels1, bondLabels2);
  REQUIRE_THAT(tier2_sim, Catch::Matchers::WithinAbs(0.5632, 0.0001));

  // Note that this differs from the paper, because RDKit thinks both
  // rings in scopoletin are aromatic.
  opts.similarityThreshold = 0.5;
  auto res = rascalMCES(*m1, *m2, opts);
  REQUIRE(res.size() == 1);
  REQUIRE(res.front().getBondMatches().size() == 8);
  // symmetry means there is more than one solution.  Re-factoring may
  // produce different, equivalent, results.
  std::vector<std::vector<std::pair<int, int>>> exp_bond_matches;
  exp_bond_matches.push_back(
      {{0, 10}, {1, 11}, {2, 12}, {3, 14}, {4, 5}, {10, 1}, {12, 9}, {13, 6}});
  exp_bond_matches.push_back(
      {{0, 7}, {1, 6}, {2, 5}, {3, 14}, {4, 12}, {10, 1}, {12, 9}, {13, 11}});
  exp_bond_matches.push_back(
      {{0, 7}, {1, 9}, {2, 11}, {3, 12}, {4, 14}, {6, 1}, {12, 6}, {13, 5}});
  exp_bond_matches.push_back(
      {{0, 10}, {1, 11}, {2, 12}, {3, 14}, {4, 5}, {6, 1}, {12, 9}, {13, 6}});
  check_expected_bonds(res.front(), exp_bond_matches);
  REQUIRE_THAT(res.front().getSimilarity(),
               Catch::Matchers::WithinAbs(0.3691, 0.0001));

  check_smarts_ok(*m1, *m2, res.front());
}

TEST_CASE("Methadone vs mepiridine test", "[basics]") {
  auto m1 = "c1ccccc1C(C(=O)CC)(c1ccccc1)CC(C)N(C)C"_smiles;
  REQUIRE(m1);
  auto m2 = "c1ccccc1C1(CCN(C)CC1)C(=O)OCC"_smiles;
  REQUIRE(m2);

  // It's a general requirement that the first mol is smaller than the second.
  std::map<int, std::vector<std::pair<int, int>>> degSeqs1, degSeqs2;
  auto tier1_sim = tier1Sim(*m1, *m2, degSeqs1, degSeqs2);
  REQUIRE_THAT(tier1_sim, Catch::Matchers::WithinAbs(0.7044, 0.0001));

  std::vector<unsigned int> bondLabels1, bondLabels2;
  RascalOptions opts;
  getBondLabels(*m1, *m2, opts, bondLabels1, bondLabels2);
  auto tier2_sim =
      tier2Sim(*m1, *m2, degSeqs1, degSeqs2, bondLabels1, bondLabels2);
  REQUIRE_THAT(tier2_sim, Catch::Matchers::WithinAbs(0.6262, 0.0001));

  opts.similarityThreshold = 0.6;
  auto res = rascalMCES(*m1, *m2, opts);
  REQUIRE(res.size() == 1);
  REQUIRE(res.front().getBondMatches().size() == 16);
  std::vector<std::vector<std::pair<int, int>>> exp_bond_matches;
  // doing this with a full initialiser confuses the auto-formatter in a
  // very unsavoury way.
  exp_bond_matches.push_back({{0, 3},
                              {1, 2},
                              {2, 1},
                              {3, 0},
                              {4, 17},
                              {5, 5},
                              {6, 12},
                              {7, 13},
                              {9, 16},
                              {10, 6},
                              {16, 18},
                              {17, 11},
                              {19, 10},
                              {20, 8},
                              {21, 9},
                              {22, 4}});
  exp_bond_matches.push_back({{5, 18},
                              {6, 12},
                              {7, 13},
                              {9, 16},
                              {10, 5},
                              {11, 4},
                              {12, 3},
                              {13, 2},
                              {14, 1},
                              {15, 0},
                              {16, 6},
                              {17, 7},
                              {19, 8},
                              {20, 9},
                              {21, 10},
                              {23, 17}});
  exp_bond_matches.push_back({{5, 18},
                              {6, 12},
                              {7, 13},
                              {9, 16},
                              {10, 5},
                              {11, 17},
                              {12, 0},
                              {13, 1},
                              {14, 2},
                              {15, 3},
                              {16, 6},
                              {17, 7},
                              {19, 8},
                              {20, 10},
                              {21, 9},
                              {23, 4}});
  exp_bond_matches.push_back({{5, 6},
                              {6, 12},
                              {7, 13},
                              {9, 16},
                              {10, 5},
                              {11, 17},
                              {12, 0},
                              {13, 1},
                              {14, 2},
                              {15, 3},
                              {16, 18},
                              {17, 11},
                              {19, 10},
                              {20, 8},
                              {21, 9},
                              {23, 4}});
  exp_bond_matches.push_back({{0, 3},
                              {1, 2},
                              {2, 1},
                              {3, 0},
                              {4, 17},
                              {5, 5},
                              {6, 12},
                              {7, 13},
                              {9, 16},
                              {10, 18},
                              {16, 6},
                              {17, 7},
                              {19, 8},
                              {20, 10},
                              {21, 9},
                              {22, 4}});
  REQUIRE(res.front().getSmarts() ==
          "c1:c:c:c:c:c:1-C(-C=O)(-[#6])-CCN(-C)-C.CC");

  check_expected_bonds(res.front(), exp_bond_matches);
  REQUIRE_THAT(res.front().getSimilarity(),
               Catch::Matchers::WithinAbs(0.6262, 0.0001));

  check_smarts_ok(*m1, *m2, res.front());
}

TEST_CASE("testosterone vs estradiol", "[basics]") {
  auto m1 = "CC12CCC3C(C1CCC2O)CCC4=CC(=O)CCC34C"_smiles;
  REQUIRE(m1);
  auto m2 = "CC12CCC3C(C1CCC2O)CCC4=C3C=CC(=C4)O"_smiles;
  REQUIRE(m2);

  RascalOptions opts;
  opts.similarityThreshold = 0.6;
  auto res = rascalMCES(*m1, *m2, opts);
  REQUIRE(res.size() == 1);
  REQUIRE(res.front().getBondMatches().size() == 16);
  std::vector<std::vector<std::pair<int, int>>> exp_bond_matches;
  exp_bond_matches.push_back({{0, 0},
                              {1, 1},
                              {2, 2},
                              {3, 3},
                              {4, 4},
                              {5, 5},
                              {6, 6},
                              {7, 7},
                              {8, 8},
                              {9, 9},
                              {10, 10},
                              {11, 11},
                              {12, 12},
                              {20, 19},
                              {21, 20},
                              {22, 21}});
  std::sort(exp_bond_matches.begin(), exp_bond_matches.end());
  bool matched = false;
  for (const auto &ebm : exp_bond_matches) {
    if (ebm == res.front().getBondMatches()) {
      matched = true;
      break;
    }
  }
  REQUIRE(matched);
  REQUIRE_THAT(res.front().getSimilarity(),
               Catch::Matchers::WithinAbs(0.4966, 0.0001));
  check_smarts_ok(*m1, *m2, res.front());
}

TEST_CASE("Symmetrical esters test", "[basics]") {
  auto m1 = "c1c(OC)c(OC)c(OC)cc1C(=O)OCCCOC(=O)c1cc(OC)c(OC)c(OC)c1"_smiles;
  REQUIRE(m1);
  auto m2 = "c1c(OC)c(OC)c(OC)cc1C(=O)OCCOC(=O)c1cc(OC)c(OC)c(OC)c1"_smiles;
  REQUIRE(m2);

  // It's a general requirement that the first mol is smaller than the second.
  std::map<int, std::vector<std::pair<int, int>>> degSeqs1, degSeqs2;
  auto tier1_sim = tier1Sim(*m1, *m2, degSeqs1, degSeqs2);
  REQUIRE_THAT(tier1_sim, Catch::Matchers::WithinAbs(0.9701, 0.0001));

  std::vector<unsigned int> bondLabels1, bondLabels2;
  RascalOptions opts;
  getBondLabels(*m1, *m2, opts, bondLabels1, bondLabels2);
  auto tier2_sim =
      tier2Sim(*m1, *m2, degSeqs1, degSeqs2, bondLabels1, bondLabels2);
  REQUIRE_THAT(tier2_sim, Catch::Matchers::WithinAbs(0.9701, 0.0001));

  opts.similarityThreshold = 0.7;
  auto res = rascalMCES(*m1, *m2, opts);
  REQUIRE(res.size() == 1);
  REQUIRE(res.front().getBondMatches().size() == 32);
  std::vector<std::vector<std::pair<int, int>>> exp_bond_matches;
  exp_bond_matches.push_back(
      {{0, 0},   {1, 1},   {2, 2},   {3, 3},   {4, 4},   {5, 5},   {6, 6},
       {7, 7},   {8, 8},   {9, 9},   {10, 10}, {11, 11}, {12, 12}, {13, 13},
       {14, 14}, {15, 15}, {18, 17}, {19, 18}, {20, 19}, {21, 32}, {22, 30},
       {23, 28}, {24, 29}, {25, 27}, {26, 25}, {27, 26}, {28, 24}, {29, 22},
       {30, 23}, {31, 21}, {32, 31}, {33, 20}});
  exp_bond_matches.push_back(
      {{0, 0},   {1, 1},   {2, 2},   {3, 3},   {4, 4},   {5, 5},   {6, 6},
       {7, 7},   {8, 8},   {9, 9},   {10, 10}, {11, 11}, {12, 12}, {13, 13},
       {14, 14}, {17, 16}, {18, 17}, {19, 18}, {20, 19}, {21, 20}, {22, 21},
       {23, 22}, {24, 23}, {25, 24}, {26, 25}, {27, 26}, {28, 27}, {29, 28},
       {30, 29}, {31, 30}, {32, 31}, {33, 32}});
  exp_bond_matches.push_back(
      {{0, 0},   {1, 1},   {2, 2},   {3, 3},   {4, 4},   {5, 5},   {6, 6},
       {7, 7},   {8, 8},   {9, 9},   {10, 10}, {11, 11}, {12, 12}, {13, 13},
       {14, 14}, {15, 15}, {18, 17}, {19, 18}, {20, 19}, {21, 20}, {22, 21},
       {23, 22}, {24, 23}, {25, 24}, {26, 25}, {27, 26}, {28, 27}, {29, 28},
       {30, 29}, {31, 30}, {32, 31}, {33, 32}});
  exp_bond_matches.push_back(
      {{0, 30},  {1, 28},  {2, 29},  {3, 27},  {4, 25},  {5, 26},  {6, 24},
       {7, 22},  {8, 23},  {9, 21},  {10, 20}, {11, 19}, {12, 18}, {13, 17},
       {16, 15}, {17, 14}, {18, 13}, {19, 12}, {20, 11}, {21, 10}, {22, 9},
       {23, 7},  {24, 8},  {25, 6},  {26, 4},  {27, 5},  {28, 3},  {29, 1},
       {30, 2},  {31, 0},  {32, 32}, {33, 31}});
  exp_bond_matches.push_back(
      {{0, 0},   {1, 1},   {2, 2},   {3, 3},   {4, 4},   {5, 5},   {6, 6},
       {7, 7},   {8, 8},   {9, 9},   {10, 10}, {11, 11}, {12, 12}, {13, 13},
       {14, 14}, {17, 16}, {18, 17}, {19, 18}, {20, 19}, {21, 32}, {22, 30},
       {23, 28}, {24, 29}, {25, 27}, {26, 25}, {27, 26}, {28, 24}, {29, 22},
       {30, 23}, {31, 21}, {32, 31}, {33, 20}});
  exp_bond_matches.push_back(
      {{0, 9},   {1, 7},   {2, 8},   {3, 6},   {4, 4},   {5, 5},   {6, 3},
       {7, 1},   {8, 2},   {9, 0},   {10, 31}, {11, 11}, {12, 12}, {13, 13},
       {14, 14}, {17, 16}, {18, 17}, {19, 18}, {20, 19}, {21, 32}, {22, 30},
       {23, 28}, {24, 29}, {25, 27}, {26, 25}, {27, 26}, {28, 24}, {29, 22},
       {30, 23}, {31, 21}, {32, 10}, {33, 20}});
  exp_bond_matches.push_back(
      {{0, 30},  {1, 28},  {2, 29},  {3, 27},  {4, 25},  {5, 26},  {6, 24},
       {7, 22},  {8, 23},  {9, 21},  {10, 20}, {11, 19}, {12, 18}, {13, 17},
       {14, 16}, {17, 14}, {18, 13}, {19, 12}, {20, 11}, {21, 10}, {22, 9},
       {23, 7},  {24, 8},  {25, 6},  {26, 4},  {27, 5},  {28, 3},  {29, 1},
       {30, 2},  {31, 0},  {32, 32}, {33, 31}});
  exp_bond_matches.push_back(
      {{0, 9},   {1, 7},   {2, 8},   {3, 6},   {4, 4},   {5, 5},   {6, 3},
       {7, 1},   {8, 2},   {9, 0},   {10, 31}, {11, 11}, {12, 12}, {13, 13},
       {16, 15}, {17, 16}, {18, 17}, {19, 18}, {20, 19}, {21, 32}, {22, 30},
       {23, 28}, {24, 29}, {25, 27}, {26, 25}, {27, 26}, {28, 24}, {29, 22},
       {30, 23}, {31, 21}, {32, 10}, {33, 20}});
  REQUIRE(
      res.front().getSmarts() ==
      "c1:c(-OC):c(-OC):c(-OC):c:c:1-C(=O)-O.CCOC(=O)-c1:c:c(-OC):c(-OC):c(-OC):c:1");
  check_expected_bonds(res.front(), exp_bond_matches);
  REQUIRE_THAT(res.front().getSimilarity(),
               Catch::Matchers::WithinAbs(0.9405, 0.0001));
  check_smarts_ok(*m1, *m2, res.front());
}

TEST_CASE("dyphylline similarities") {
  auto dyphylline = "OCC(O)CN1C=NC2=C1C(=O)N(C)C(=O)N(C)2"_smiles;
  // The paper has the similarity scores as 0.78, 0.57, 0.51, 0.63 and 0.35
  // respectively. This implementation makes Viagra 0.19 because of the default
  // completeAromaticRings. Without that, it comes to 0.26.  The 0.63 for
  // enprofylline could be a typo, as this gets 0.73.  The 0.51 for captogon is
  // a mystery - with 15 atoms and 16 bonds in the MCES, 0.48 is correct.  To
  // get 0.51 there would need to be 16 atoms in the MCES which doesn't look
  // right.
  std::vector<std::tuple<std::shared_ptr<RDKit::RWMol>, std::string, double>> mols{
      {"CN1C=NC2=C1C(=O)N(C)C(=O)N(C)2"_smiles, "caffeine", 0.78},
      {"C12C(=O)NC(=O)NC(NC(=O)N2)=1"_smiles, "uric acid", 0.57},
      {"c1ccccc1CC(C)N(C)CCN1C=NC2=C1C(=O)N(C)C(=O)N(C)2"_smiles, "captagon",
       0.48},
      {"CCCN1C(=O)NC(=O)C2N=CNC1=2"_smiles, "enprofylline", 0.73},
      {"CN1CCN(CC1)S(=O)(=O)c1ccc(OCC)c(c1)C1=NC(=O)C2N(C)N=C(CCC)C(N1)=2"_smiles,
       "viagra", 0.19},
      {"OCCN(C)C1=NC2N(C)C(=O)N(C)C(=O)C(N1C)=2"_smiles, "cafaminol", 0.80}};
  RascalOptions opts;
  opts.similarityThreshold = 0.3;
  for (size_t i = 0; i < 6; ++i) {
    auto m = mols[i];
    auto res = rascalMCES(*dyphylline, *std::get<0>(m), opts);
    REQUIRE(res.size() == 1);
    REQUIRE_THAT(res.front().getSimilarity(),
                 Catch::Matchers::WithinAbs(std::get<2>(m), 0.01));
    check_smarts_ok(*dyphylline, *std::get<0>(m), res.front());
  }
}

TEST_CASE("delta-y exchange", "[basics]") {
  RascalOptions opts;
  opts.similarityThreshold = 0.1;
  {
    // A delta-y exchange causes a false match, which in this
    // case will have the cyclopropyl ring matching part of the
    // t-butyl, a 3-bond match.
    auto m1 = "CC1CC1"_smiles;
    REQUIRE(m1);
    auto m2 = "CC(C)(C)C"_smiles;
    REQUIRE(m2);

    auto res = rascalMCES(*m1, *m2, opts);
    REQUIRE(res.size() == 1);
    REQUIRE(res.front().getBondMatches().size() == 3);
    std::vector<std::vector<std::pair<int, int>>> exp_bond_matches;
    exp_bond_matches.push_back({{0, 1}, {1, 3}, {3, 0}});
    exp_bond_matches.push_back({{0, 2}, {1, 3}, {3, 1}});
    exp_bond_matches.push_back({{0, 1}, {1, 2}, {3, 3}});
    check_expected_bonds(res.front(), exp_bond_matches);
    REQUIRE_THAT(res.front().getSimilarity(),
                 Catch::Matchers::WithinAbs(0.6806, 0.0001));
    check_smarts_ok(*m1, *m2, res.front());
  }
  {
    // A delta-y exchange causes a false match, which in this
    // case will have the cyclopropyl ring matching part of the
    // t-butyl, a 3-bond match.
    auto m1 = "C1CCCCC12CC2"_smiles;
    REQUIRE(m1);
    auto m2 = "C1CCCCC1(C)(C)"_smiles;
    REQUIRE(m2);

    auto res = rascalMCES(*m1, *m2, opts);
    REQUIRE(res.size() == 1);
    REQUIRE(res.front().getBondMatches().size() == 8);
    std::vector<std::vector<std::pair<int, int>>> exp_bond_matches;
    exp_bond_matches.push_back(
        {{0, 3}, {1, 2}, {2, 1}, {3, 0}, {4, 7}, {5, 6}, {7, 4}, {8, 5}});
    exp_bond_matches.push_back(
        {{0, 3}, {1, 2}, {2, 1}, {3, 0}, {4, 7}, {5, 5}, {7, 4}, {8, 6}});
    check_expected_bonds(res.front(), exp_bond_matches);
    REQUIRE_THAT(res.front().getSimilarity(),
                 Catch::Matchers::WithinAbs(0.9412, 0.0001));
    check_smarts_ok(*m1, *m2, res.front());
  }
}

TEST_CASE("bad aromatics 1") {
  std::vector<std::tuple<std::string, std::string, unsigned int, unsigned int>>
      tests = {
          {"c1ccccc1C(=O)c1ccncc1", "c1ccccc1C(=O)c1ccccc1", 9, 13},
          {"c1ccccc1C(=O)c1cc[nH]c1", "c1ccccc1C(=O)c1cnccc1", 9, 13},
          {"c1ccccc1C(=O)c1ccncc1", "c1ccccc1C(=O)c1cnccc1", 14, 14},
          {"c1ccccc1C(=O)c1ccc2cnccc2c1", "c1ccccc1C(=O)c1cnccc1", 14, 14}};

  RascalOptions opts;
  opts.similarityThreshold = 0.7;
  for (auto &test : tests) {
    std::unique_ptr<RDKit::RWMol> m1(RDKit::SmilesToMol(std::get<0>(test)));
    std::unique_ptr<RDKit::RWMol> m2(RDKit::SmilesToMol(std::get<1>(test)));
    opts.completeAromaticRings = true;
    auto res = rascalMCES(*m1, *m2, opts);
    REQUIRE(res.size() == 1);
    REQUIRE(res.front().getBondMatches().size() == std::get<2>(test));
    check_smarts_ok(*m1, *m2, res.front());

    opts.completeAromaticRings = false;
    res = rascalMCES(*m1, *m2, opts);
    REQUIRE(res.size() == 1);
    REQUIRE(res.front().getBondMatches().size() == std::get<3>(test));
    check_smarts_ok(*m1, *m2, res.front());
  }
}

TEST_CASE("single fragment") {
  RascalOptions opts;
  std::vector<std::tuple<std::string, std::string, unsigned int, unsigned int>>
      tests = {
          {"C1CC1CCC1NC1", "C1CC1CCCCC1NC1", 8, 5},
          {"c1cnccc1CCc1ncccc1", "c1cnccc1CCCCCCc1ncccc1", 14, 8},
          {"c1ccccc1c1cccc(c1)CCc1ccccc1", "c1ccccc1c1cccc(c1)CCCCCc1ccccc1",
           21, 15},
          {"Cc1cc2nc(-c3cccc(NC(=O)CSc4ccc(Cl)cc4)c3)oc2cc1C  CHEMBL1398008",
           "COc1ccc2oc(-c3ccc(C)c(NC(=O)COc4cc(C)cc(C)c4)c3)nc2c1  CHEMBL1436972",
           27, 21}};
  opts.similarityThreshold = 0.7;
  for (auto &test : tests) {
    opts.ringMatchesRingOnly = true;
    opts.singleLargestFrag = false;
    std::unique_ptr<RDKit::RWMol> m1(RDKit::SmilesToMol(std::get<0>(test)));
    std::unique_ptr<RDKit::RWMol> m2(RDKit::SmilesToMol(std::get<1>(test)));
    auto res = rascalMCES(*m1, *m2, opts);
    REQUIRE(res.front().getNumFrags() == 2);
    REQUIRE(res.front().getBondMatches().size() == std::get<2>(test));
    check_smarts_ok(*m1, *m2, res.front());
    opts.singleLargestFrag = true;
    res = rascalMCES(*m1, *m2, opts);
    REQUIRE(res.front().getNumFrags() == 1);
    REQUIRE(res.front().getBondMatches().size() == std::get<3>(test));
    REQUIRE(res.front().getLargestFragSize() ==
            res.front().getAtomMatches().size());
    check_smarts_ok(*m1, *m2, res.front());
  }
}

TEST_CASE("minimum fragment sizes") {
  RascalOptions opts;

  std::vector<std::tuple<std::string, std::string, unsigned int, unsigned int>>
      tests = {
          {"Oc1cccc2C(=O)C=CC(=O)c12", "O1C(=O)C=Cc2cc(OC)c(O)cc12", 8, 7},
          {"c1ccccc1c1cccc(c1)CCc1ccccc1", "c1ccccc1c1cccc(c1)CCCCCc1ccccc1",
           21, 21},
      };
  opts.similarityThreshold = 0.5;
  for (auto &test : tests) {
    std::unique_ptr<RDKit::RWMol> m1(RDKit::SmilesToMol(std::get<0>(test)));
    std::unique_ptr<RDKit::RWMol> m2(RDKit::SmilesToMol(std::get<1>(test)));
    opts.minFragSize = 1;
    auto res = rascalMCES(*m1, *m2, opts);
    REQUIRE(res.size() == 1);
    REQUIRE(res.front().getBondMatches().size() == std::get<2>(test));
    check_smarts_ok(*m1, *m2, res.front());

    opts.minFragSize = 3;
    res = rascalMCES(*m1, *m2, opts);
    REQUIRE(res.size() == 1);
    REQUIRE(res.front().getBondMatches().size() == std::get<3>(test));
    check_smarts_ok(*m1, *m2, res.front());
  }
}

TEST_CASE("maximum fragment separation") {
  RascalOptions opts;

  std::vector<std::tuple<std::string, std::string, unsigned int, unsigned int>>
      tests = {
          {"c1ccccc1CCc1ccccc1", "c1ccccc1CCCCCCCCc1ccccc1", 14, 9},
          {"c1ccccc1c1cccc(c1)CCc1ccccc1", "c1ccccc1c1cccc(c1)CCCCCCCc1ccccc1",
           21, 16},
      };
  opts.similarityThreshold = 0.5;
  for (auto &test : tests) {
    std::unique_ptr<RDKit::RWMol> m1(RDKit::SmilesToMol(std::get<0>(test)));
    std::unique_ptr<RDKit::RWMol> m2(RDKit::SmilesToMol(std::get<1>(test)));
    {
      opts.maxFragSeparation = -1;
      auto res = rascalMCES(*m1, *m2, opts);
      REQUIRE(res.size() == 1);
      REQUIRE(res.front().getBondMatches().size() == std::get<2>(test));
      check_smarts_ok(*m1, *m2, res.front());
    }
    {
      opts.maxFragSeparation = 3;
      opts.timeout = 300;
      auto res = rascalMCES(*m1, *m2, opts);
      REQUIRE(res.size() == 1);
      REQUIRE(res.front().getBondMatches().size() == std::get<3>(test));
      check_smarts_ok(*m1, *m2, res.front());
    }
  }
}

TEST_CASE("ring matches ring", "[basics]") {
  // This is methadone vs mepiridine.  The default result in this case is
  // very unsavoury due to 2 single bond matches.
  auto m1 = "c1ccccc1C(C(=O)CC)(c1ccccc1)CC(C)N(C)C"_smiles;
  REQUIRE(m1);
  auto m2 = "c1ccccc1C1(CCN(C)CC1)C(=O)OCC"_smiles;
  REQUIRE(m2);

  RascalOptions opts;
  opts.similarityThreshold = 0.6;
  opts.ringMatchesRingOnly = true;
  auto res = rascalMCES(*m1, *m2, opts);
  REQUIRE(res.size() == 1);
  REQUIRE(res.front().getBondMatches().size() == 11);
  std::vector<std::vector<std::pair<int, int>>> exp_bond_matches;
  // doing this with a full initialiser confuses the auto-formatter in a
  // very unsightly way.
  exp_bond_matches.push_back({{0, 0},
                              {1, 1},
                              {2, 2},
                              {3, 3},
                              {4, 4},
                              {5, 5},
                              {6, 12},
                              {7, 13},
                              {9, 16},
                              {19, 9},
                              {22, 17}});
  exp_bond_matches.push_back({{6, 12},
                              {7, 13},
                              {10, 5},
                              {11, 4},
                              {12, 3},
                              {13, 2},
                              {14, 1},
                              {15, 0},
                              {17, 16},
                              {21, 9},
                              {23, 17}});
  exp_bond_matches.push_back({{6, 12},
                              {7, 13},
                              {10, 5},
                              {11, 17},
                              {12, 0},
                              {13, 1},
                              {14, 2},
                              {15, 3},
                              {17, 16},
                              {21, 9},
                              {23, 4}});
  exp_bond_matches.push_back({{6, 12},
                              {7, 13},
                              {10, 5},
                              {11, 17},
                              {12, 0},
                              {13, 1},
                              {14, 2},
                              {15, 3},
                              {17, 16},
                              {20, 9},
                              {23, 4}});

  check_expected_bonds(res.front(), exp_bond_matches);
  REQUIRE_THAT(res.front().getSimilarity(),
               Catch::Matchers::WithinAbs(0.3312, 0.0001));
  check_smarts_ok(*m1, *m2, res.front());

  // This reduces it to the single largest fragment
  opts.singleLargestFrag = true;
  res = rascalMCES(*m1, *m2, opts);
  REQUIRE(res.size() == 1);
  REQUIRE(res.front().getBondMatches().size() == 9);
  REQUIRE_THAT(res.front().getSimilarity(),
               Catch::Matchers::WithinAbs(0.1863, 0.0001));
  REQUIRE(res.front().getSmarts() == "c1:c:c:c:c:c:1-CC=O");
  check_smarts_ok(*m1, *m2, res.front());
}

TEST_CASE("complete smallest rings") {
  RascalOptions opts;
  opts.completeSmallestRings = true;
  opts.similarityThreshold = 0.1;

  auto m1 = "CNC1CCC(C)CC1C"_smiles;
  REQUIRE(m1);
  auto m2 = "CNC1CCC2CCCCCCCCCCCC1C2"_smiles;
  REQUIRE(m2);

  {
    auto res = rascalMCES(*m1, *m2, opts);
    REQUIRE(res.size() == 1);
    REQUIRE(res.front().getNumFrags() == 1);
    REQUIRE(res.front().getSmarts() == "CNC1CCCCC1");
  }

  // Default option; allows partial ring return
  opts.completeSmallestRings = false;
  {
    auto res = rascalMCES(*m1, *m2, opts);
    REQUIRE(res.size() == 1);
    REQUIRE(res.front().getNumFrags() == 1);
    REQUIRE(res.front().getSmarts() == "CNC1CCC(-C)-CC1C");
  }
}

TEST_CASE("multiple cliques returned") {
  std::vector<std::tuple<std::string, std::string, unsigned int, unsigned int,
                         std::vector<std::pair<int, int>>>>
      tests = {
          {"Oc1cccc2C(=O)C=CC(=O)c12",
           "O1C(=O)C=Cc2cc(OC)c(O)cc12",
           8,
           8,
           {{0, 10},
            {1, 9},
            {2, 6},
            {3, 5},
            {4, 14},
            {6, 1},
            {12, 11},
            {13, 12}}},
          {"Oc1cccc2C(=O)C(C)=CC(=O)c12",
           "O1C(=O)C(C)=Cc2cc(OC)c(O)cc12",
           16,
           9,
           {{0, 11},
            {1, 10},
            {2, 7},
            {3, 6},
            {4, 15},
            {8, 3},
            {11, 1},
            {13, 12},
            {14, 13}}},
      };

  RascalOptions opts;
  opts.similarityThreshold = 0.5;

  for (auto &test : tests) {
    opts.allBestMCESs = true;
    std::unique_ptr<RDKit::RWMol> m1(RDKit::SmilesToMol(std::get<0>(test)));
    std::unique_ptr<RDKit::RWMol> m2(RDKit::SmilesToMol(std::get<1>(test)));

    auto res = rascalMCES(*m1, *m2, opts);
    REQUIRE(!res.empty());
    CHECK(res.size() == std::get<2>(test));
    CHECK(res.front().getBondMatches().size() == std::get<3>(test));
    CHECK(res.front().getBondMatches() == std::get<4>(test));
    check_smarts_ok(*m1, *m2, res.front());

    opts.allBestMCESs = false;
    res = rascalMCES(*m1, *m2, opts);
    REQUIRE(res.size() == 1);
    // The clique won't necessarily be the best-scoring one, but it should be
    // the same size.
    CHECK(res.front().getBondMatches().size() == std::get<4>(test).size());
    check_smarts_ok(*m1, *m2, res.front());
  }
}

// Anything starting FMCS is taken from the test data for RDKit's FMCS tests.
TEST_CASE("FMCS test1Basics") {
  auto m1 = "CC1CCC(N)CC1"_smiles;
  REQUIRE(m1);
  auto m2 = "CC1CC(C)CC(C)C1"_smiles;
  REQUIRE(m2);

  RascalOptions opts;
  opts.similarityThreshold = 0.6;
  auto res = rascalMCES(*m1, *m2, opts);

  REQUIRE(res.size() == 1);
  REQUIRE(res.front().getBondMatches().size() == 7);
  REQUIRE(res.front().getSmarts() == "CC1CCCCC1");
  REQUIRE_THAT(res.front().getSimilarity(),
               Catch::Matchers::WithinAbs(0.6806, 0.0001));

  check_smarts_ok(*m1, *m2, res.front());
}

TEST_CASE("FMCS test32") {
  std::vector<std::shared_ptr<RDKit::ROMol>> mols{
      {"O=C(Nc1cc(S(N2CCOCC2)(=O)=O)ccc1N1CCOCC1)C=Cc1ccc(Cl)cc1 CHEMBL1515359"_smiles},
      {"c1ccc(C=CC(Nc2cc(S(N3CCOCC3)(=O)=O)ccc2N2CCOCC2)=O)cc1 CHEMBL1590658"_smiles},
      {"Cc1ccc(C=CC(=O)Nc2cc(S(N3CCOCC3)(=O)=O)ccc2N2CCOCC2)cc1 CHEMBL1447567"_smiles},
      {"c1ccc(C=CC(Nc2cc(S(N3CCOCC3)(=O)=O)ccc2N2CCCC2)=O)cc1 CHEMBL1384017"_smiles},
      {"O=C(C=Cc1ccc(F)cc1)Nc1cc(S(N2CCOCC2)(=O)=O)ccc1N1CCCC1 CHEMBL1456416"_smiles},
      {"c1cc(F)cc(C=CC(=O)Nc2c(N3CCCC3)ccc(S(N3CCOCC3)(=O)=O)c2)c1 CHEMBL1308819"_smiles},
      {"CCN1CCN(c2ccc(S(N3CCOCC3)(=O)=O)cc2NC(=O)C=Cc2ccc(C)cc2)CC1 CHEMBL1703007"_smiles},
      {"c1cc(C=CC(=O)Nc2cc(S(N3CCOCC3)(=O)=O)ccc2N2CCOCC2)c([N+]([O-])=O)cc1 CHEMBL1707819"_smiles},
      {"N#CC(=Cc1ccccc1)C(=O)Nc1cc(S(N2CCOCC2)(=O)=O)ccc1N1CCCC1 CHEMBL1500793"_smiles},
      {"C(=Cc1ccc2c(c1)OCO2)C(Nc1cc(S(=O)(=O)N2CCOCC2)ccc1N1CCOCC1)=O CHEMBL1334715"_smiles}};
  RascalOptions opts;
  std::vector<std::tuple<unsigned int, unsigned int, std::string>> exp_res{
      {32, 35,
       "O=C(-Nc1:c:c(-S(-N2CCOCC2)(=O)=O):c:c:c:1-N1CCOCC1)-C=Cc1:c:c:c:c:c:1"},
      {32, 35,
       "O=C(-Nc1:c:c(-S(-N2CCOCC2)(=O)=O):c:c:c:1-N1CCOCC1)-C=Cc1:c:c:c:c:c:1"},
      {31, 33,
       "O=C(-Nc1:c:c(-S(-N2CCOCC2)(=O)=O):c:c:c:1-N(-CC)-CC)-C=Cc1:c:c:c:c:c:1"},
      {31, 33,
       "O=C(-Nc1:c:c(-S(-N2CCOCC2)(=O)=O):c:c:c:1-N(-CC)-CC)-C=Cc1:c:c:c:c:c:1"},
      {31, 33,
       "O=C(-Nc1:c:c(-S(-N2CCOCC2)(=O)=O):c:c:c:1-N(-CC)-CC)-C=Cc1:c:c:c:c:c:1"},
      {31, 33,
       "O=C(-Nc1:c:c(-S(-N2CCOCC2)(=O)=O):c:c:c:1-N(-CC)-CC)-C=Cc1:c:c:c:c:c:1"},
      {32, 35,
       "O=C(-Nc1:c:c(-S(-N2CCOCC2)(=O)=O):c:c:c:1-N1CCOCC1)-C=Cc1:c:c:c:c:c:1"},
      {31, 33,
       "O=C(-Nc1:c:c(-S(-N2CCOCC2)(=O)=O):c:c:c:1-N(-CC)-CC)-C=Cc1:c:c:c:c:c:1"},
      {32, 35,
       "O=C(-Nc1:c:c(-S(-N2CCOCC2)(=O)=O):c:c:c:1-N1CCOCC1)-C=Cc1:c:c:c:c:c:1"},
      {32, 35,
       "c1:c:c:c(-C=CC(-Nc2:c:c(-S(-N3CCOCC3)(=O)=O):c:c:c:2-N2CCOCC2)=O):c:c:1"},
      {31, 33,
       "c1:c:c:c(-C=CC(-Nc2:c:c(-S(-N3CCOCC3)(=O)=O):c:c:c:2-N(-CC)-CC)=O):c:c:1"},
      {31, 33,
       "c1:c:c:c(-C=CC(-Nc2:c:c(-S(-N3CCOCC3)(=O)=O):c:c:c:2-N(-CC)-CC)=O):c:c:1"},
      {31, 33,
       "c1:c:c:c(-C=CC(-Nc2:c:c(-S(-N3CCOCC3)(=O)=O):c:c:c:2-N(-CC)-CC)=O):c:c:1"},
      {31, 33,
       "c1:c:c:c(-C=CC(-Nc2:c:c(-S(-N3CCOCC3)(=O)=O):c:c:c:2-N(-CC)-CC)=O):c:c:1"},
      {32, 35,
       "c1:c:c:c(-C=CC(-Nc2:c:c(-S(-N3CCOCC3)(=O)=O):c:c:c:2-N2CCOCC2)=O):c:c:1"},
      {31, 33,
       "c1:c:c:c(-C=CC(-Nc2:c:c(-S(-N3CCOCC3)(=O)=O):c:c:c:2-N(-CC)-CC)=O):c:c:1"},
      {32, 35,
       "c1:c:c:c(-C=CC(-Nc2:c:c(-S(-N3CCOCC3)(=O)=O):c:c:c:2-N2CCOCC2)=O):c:c:1"},
      {31, 33,
       "c1:c:c:c(-C=CC(=O)-Nc2:c:c(-S(-N3CCOCC3)(=O)=O):c:c:c:2-N(-CC)-CC):c:c:1"},
      {31, 33,
       "c1:c:c:c(-C=CC(=O)-Nc2:c:c(-S(-N3CCOCC3)(=O)=O):c:c:c:2-N(-CC)-CC):c:c:1"},
      {31, 33,
       "c1:c:c:c(-C=CC(=O)-Nc2:c:c(-S(-N3CCOCC3)(=O)=O):c:c:c:2-N(-CC)-CC):c:c:1"},
      {32, 34,
       "Cc1:c:c:c(-C=CC(=O)-Nc2:c:c(-S(-N3CCOCC3)(=O)=O):c:c:c:2-N(-CC)-CC):c:c:1"},
      {32, 35,
       "c1:c:c:c(-C=CC(=O)-Nc2:c:c(-S(-N3CCOCC3)(=O)=O):c:c:c:2-N2CCOCC2):c:c:1"},
      {31, 33,
       "c1:c:c:c(-C=CC(=O)-Nc2:c:c(-S(-N3CCOCC3)(=O)=O):c:c:c:2-N(-CC)-CC):c:c:1"},
      {32, 35,
       "c1:c:c:c(-C=CC(=O)-Nc2:c:c(-S(-N3CCOCC3)(=O)=O):c:c:c:2-N2CCOCC2):c:c:1"},
      {31, 34,
       "c1:c:c:c(-C=CC(-Nc2:c:c(-S(-N3CCOCC3)(=O)=O):c:c:c:2-N2CCCC2)=O):c:c:1"},
      {31, 34,
       "c1:c:c:c(-C=CC(-Nc2:c:c(-S(-N3CCOCC3)(=O)=O):c:c:c:2-N2CCCC2)=O):c:c:1"},
      {31, 33,
       "c1:c:c:c(-C=CC(-Nc2:c:c(-S(-N3CCOCC3)(=O)=O):c:c:c:2-N(-CC)-CC)=O):c:c:1"},
      {31, 33,
       "c1:c:c:c(-C=CC(-Nc2:c:c(-S(-N3CCOCC3)(=O)=O):c:c:c:2-N(-CC)-CC)=O):c:c:1"},
      {31, 34,
       "c1:c:c:c(-C=CC(-Nc2:c:c(-S(-N3CCOCC3)(=O)=O):c:c:c:2-N2CCCC2)=O):c:c:1"},
      {31, 33,
       "c1:c:c:c(-C=CC(-Nc2:c:c(-S(-N3CCOCC3)(=O)=O):c:c:c:2-N(-CC)-CC)=O):c:c:1"},
      {32, 34,
       "O=C(-C=C)-Nc1:c:c(-S(-N2CCOCC2)(=O)=O):c:c:c:1-N1CCCC1.c1:c:c:c(-F):c:c:1"},
      {31, 33,
       "O=C(-C=Cc1:c:c:c:c:c:1)-Nc1:c:c(-S(-N2CCOCC2)(=O)=O):c:c:c:1-N(-CC)-CC"},
      {31, 33,
       "O=C(-C=Cc1:c:c:c:c:c:1)-Nc1:c:c(-S(-N2CCOCC2)(=O)=O):c:c:c:1-N(-CC)-CC"},
      {31, 34,
       "O=C(-C=Cc1:c:c:c:c:c:1)-Nc1:c:c(-S(-N2CCOCC2)(=O)=O):c:c:c:1-N1CCCC1"},
      {31, 33,
       "O=C(-C=Cc1:c:c:c:c:c:1)-Nc1:c:c(-S(-N2CCOCC2)(=O)=O):c:c:c:1-N(-CC)-CC"},
      {31, 33,
       "c1:c:c:c:c(-C=CC(=O)-Nc2:c(-N(-CC)-CC):c:c:c(-S(-N3CCOCC3)(=O)=O):c:2):c:1"},
      {31, 33,
       "c1:c:c:c:c(-C=CC(=O)-Nc2:c(-N(-CC)-CC):c:c:c(-S(-N3CCOCC3)(=O)=O):c:2):c:1"},
      {31, 34,
       "c1:c:c:c:c(-C=CC(=O)-Nc2:c(-N3CCCC3):c:c:c(-S(-N3CCOCC3)(=O)=O):c:2):c:1"},
      {31, 33,
       "c1:c:c:c:c(-C=CC(=O)-Nc2:c(-N(-CC)-CC):c:c:c(-S(-N3CCOCC3)(=O)=O):c:2):c:1"},
      {31, 33,
       "CCN(-c1:c:c:c(-S(-N2CCOCC2)(=O)=O):c:c:1-NC(=O)-C=Cc1:c:c:c:c:c:1)-CC"},
      {31, 33,
       "CCN(-c1:c:c:c(-S(-N2CCOCC2)(=O)=O):c:c:1-NC(=O)-C=Cc1:c:c:c:c:c:1)-CC"},
      {31, 33,
       "CCN(-c1:c:c:c(-S(-N2CCOCC2)(=O)=O):c:c:1-NC(=O)-C=Cc1:c:c:c:c:c:1)-CC"},
      {31, 33,
       "c1:c:c(-C=CC(=O)-Nc2:c:c(-S(-N3CCOCC3)(=O)=O):c:c:c:2-N(-CC)-CC):c:c:c:1"},
      {32, 35,
       "c1:c:c(-C=CC(=O)-Nc2:c:c(-S(-N3CCOCC3)(=O)=O):c:c:c:2-N2CCOCC2):c:c:c:1"},
      {31, 33,
       "C(=Cc1:c:c:c:c:c:1)-C(=O)-Nc1:c:c(-S(-N2CCOCC2)(=O)=O):c:c:c:1-N(-CC)-CC"}};
  size_t k = 0;
  for (size_t i = 0; i < mols.size() - 1; ++i) {
    for (size_t j = i + 1; j < mols.size(); ++j, ++k) {
      auto res = rascalMCES(*mols[i], *mols[j], opts);
      check_smarts_ok(*mols[i], *mols[j], res.front());
      REQUIRE(res.front().getAtomMatches().size() == std::get<0>(exp_res[k]));
      REQUIRE(res.front().getBondMatches().size() == std::get<1>(exp_res[k]));
      REQUIRE(res.front().getSmarts() == std::get<2>(exp_res[k]));
    }
  }
}

TEST_CASE("FMCS test190") {
  std::vector<std::shared_ptr<RDKit::ROMol>> mols{
      {"COc1cc2nc(-c3cc(NC(=O)CSc4ccc(Cl)cc4)ccc3)oc2cc1  CHEMBL1479679"_smiles},
      {"COc1cc2nc(-c3cc(NC(=O)CSc4ccc(Cl)cc4)c(C)cc3)oc2cc1  CHEMBL1333382"_smiles},
      {"Cc1cc2oc(-c3cc(NC(=O)CSc4ccc(Cl)cc4)ccc3)nc2cc1  CHEMBL1437584"_smiles},
      {"COc1c(NC(=O)CSc2ccc(Cl)cc2)cc(-c2nc3ccccc3o2)cc1  CHEMBL1601350"_smiles},
      {"Cc1cc2nc(-c3cccc(NC(=O)CSc4ccc(Cl)cc4)c3)oc2cc1C  CHEMBL1398008"_smiles},
      {"Cc1cc2oc(-c3cc(NC(=O)CSc4ccc(Cl)cc4)c(C)cc3)nc2cc1  CHEMBL1612903"_smiles},
      {"COc1cc2nc(-c3cc(NC(=O)Cc4ccc(Cl)cc4)c(C)cc3)oc2cc1  CHEMBL1316483"_smiles},
      {"Cc1c(NC(=O)CSc2ccc(Cl)cc2)cccc1-c1nc2cc(Cl)ccc2o1  CHEMBL1568754"_smiles},
      {"COc1ccc2oc(-c3ccc(C)c(NC(=O)COc4cc(C)cc(C)c4)c3)nc2c1  CHEMBL1436972"_smiles},
      {"Cc1ccc(SCC(=O)Nc2cc(-c3nc4cc(C)ccc4o3)c(O)cc2)cc1  CHEMBL1611932"_smiles},
  };
  RascalOptions opts;
  opts.allBestMCESs = true;
  std::vector<std::tuple<unsigned int, unsigned int, std::string>> exp_res{
      {29, 32,
       "COc1:c:c2:n:c(-c3:c:c(-NC(=O)-CSc4:c:c:c(-Cl):c:c:4):c:c:c:3):o:c:2:c:c:1"},
      {27, 30,
       "c1:c:c2:n:c(-c3:c:c(-NC(=O)-CSc4:c:c:c(-Cl):c:c:4):c:c:c:3):o:c:2:c:c:1"},
      {29, 31,
       "CO.c1:c:c2:n:c(-c3:c:c(-NC(=O)-CSc4:c:c:c(-Cl):c:c:4):c:c:c:3):o:c:2:c:c:1"},
      {27, 30,
       "c1:c:c2:n:c(-c3:c:c(-NC(=O)-CSc4:c:c:c(-Cl):c:c:4):c:c:c:3):o:c:2:c:c:1"},
      {27, 30,
       "c1:c:c2:n:c(-c3:c:c(-NC(=O)-CSc4:c:c:c(-Cl):c:c:4):c:c:c:3):o:c:2:c:c:1"},
      {28, 30,
       "COc1:c:c2:n:c(-c3:c:c(-NC(=O)-C):c:c:c:3):o:c:2:c:c:1.c1:c:c:c(-Cl):c:c:1"},
      {27, 30,
       "c1:c:c2:n:c(-c3:c:c(-NC(=O)-CSc4:c:c:c(-Cl):c:c:4):c:c:c:3):o:c:2:c:c:1"},
      {27, 29,
       "COc1:c:c2:n:c(-c3:c:c(-NC(=O)-C):c:c:c:3):o:c:2:c:c:1.c1:c:c:c:c:c:1"},
      {26, 29,
       "c1:c:c2:n:c(-c3:c:c(-NC(=O)-CSc4:c:c:c:c:c:4):c:c:c:3):o:c:2:c:c:1"},
      {27, 30,
       "c1:c:c2:n:c(-c3:c:c(-NC(=O)-CSc4:c:c:c(-Cl):c:c:4):c:c:c:3):o:c:2:c:c:1"},
      {29, 31,
       "CO.c1:c:c2:n:c(-c3:c:c(-NC(=O)-CSc4:c:c:c(-Cl):c:c:4):c:c:c:3):o:c:2:c:c:1"},
      {27, 30,
       "c1:c:c2:n:c(-c3:c:c(-NC(=O)-CSc4:c:c:c(-Cl):c:c:4):c:c:c:3):o:c:2:c:c:1"},
      {28, 31,
       "c1:c:c2:n:c(-c3:c:c(-NC(=O)-CSc4:c:c:c(-Cl):c:c:4):c(-C):c:c:3):o:c:2:c:c:1"},
      {29, 31,
       "COc1:c:c2:n:c(-c3:c:c(-NC(=O)-C):c(-C):c:c:3):o:c:2:c:c:1.c1:c:c:c(-Cl):c:c:1"},
      {27, 30,
       "c1:c:c2:n:c(-c3:c:c(-NC(=O)-CSc4:c:c:c(-Cl):c:c:4):c:c:c:3):o:c:2:c:c:1"},
      {28, 30,
       "COc1:c:c2:n:c(-c3:c:c(-NC(=O)-C):c(-C):c:c:3):o:c:2:c:c:1.c1:c:c:c:c:c:1"},
      {26, 29,
       "c1:c:c2:n:c(-c3:c:c(-NC(=O)-CSc4:c:c:c:c:c:4):c:c:c:3):o:c:2:c:c:1"},
      {27, 30,
       "c1:c:c2:o:c(-c3:c:c(-NC(=O)-CSc4:c:c:c(-Cl):c:c:4):c:c:c:3):n:c:2:c:c:1"},
      {28, 31,
       "Cc1:c:c2:o:c(-c3:c:c(-NC(=O)-CSc4:c:c:c(-Cl):c:c:4):c:c:c:3):n:c:2:c:c:1"},
      {28, 31,
       "Cc1:c:c2:o:c(-c3:c:c(-NC(=O)-CSc4:c:c:c(-Cl):c:c:4):c:c:c:3):n:c:2:c:c:1"},
      {26, 28,
       "c1:c:c2:o:c(-c3:c:c(-NC(=O)-C):c:c:c:3):n:c:2:c:c:1.c1:c:c:c(-Cl):c:c:1"},
      {27, 30,
       "c1:c:c2:o:c(-c3:c:c(-NC(=O)-CSc4:c:c:c(-Cl):c:c:4):c:c:c:3):n:c:2:c:c:1"},
      {25, 27,
       "c1:c:c2:o:c(-c3:c:c(-NC(=O)-C):c:c:c:3):n:c:2:c:c:1.c1:c:c:c:c:c:1"},
      {26, 29,
       "c1:c:c2:o:c(-c3:c:c(-NC(=O)-CSc4:c:c:c:c:c:4):c:c:c:3):n:c:2:c:c:1"},
      {27, 30,
       "c1:c(-NC(=O)-CSc2:c:c:c(-Cl):c:c:2):c:c(-c2:n:c3:c:c:c:c:c:3:o:2):c:c:1"},
      {27, 30,
       "c1:c(-NC(=O)-CSc2:c:c:c(-Cl):c:c:2):c:c(-c2:n:c3:c:c:c:c:c:3:o:2):c:c:1"},
      {28, 29,
       "CO.c1:c(-NC(=O)-C):c:c(-c2:n:c3:c:c:c:c:c:3:o:2):c:c:1.c1:c:c:c(-Cl):c:c:1"},
      {27, 30,
       "c1:c(-NC(=O)-CSc2:c:c:c(-Cl):c:c:2):c:c(-c2:n:c3:c:c:c:c:c:3:o:2):c:c:1"},
      {27, 28,
       "CO.c1:c(-NC(=O)-C):c:c(-c2:n:c3:c:c:c:c:c:3:o:2):c:c:1.c1:c:c:c:c:c:1"},
      {26, 29,
       "c1:c(-NC(=O)-CSc2:c:c:c:c:c:2):c:c(-c2:n:c3:c:c:c:c:c:3:o:2):c:c:1"},
      {28, 31,
       "c1:c:c2:n:c(-c3:c:c:c:c(-NC(=O)-CSc4:c:c:c(-Cl):c:c:4):c:3):o:c:2:c:c:1-C"},
      {26, 28,
       "c1:c:c2:n:c(-c3:c:c:c:c(-NC(=O)-C):c:3):o:c:2:c:c:1.c1:c:c:c(-Cl):c:c:1"},
      {27, 30,
       "c1:c:c2:n:c(-c3:c:c:c:c(-NC(=O)-CSc4:c:c:c(-Cl):c:c:4):c:3):o:c:2:c:c:1"},
      {25, 27,
       "c1:c:c2:n:c(-c3:c:c:c:c(-NC(=O)-C):c:3):o:c:2:c:c:1.c1:c:c:c:c:c:1"},
      {27, 30,
       "Cc1:c:c2:n:c(-c3:c:c:c:c(-NC(=O)-CSc4:c:c:c:c:c:4):c:3):o:c:2:c:c:1"},
      {27, 29,
       "c1:c:c2:o:c(-c3:c:c(-NC(=O)-C):c(-C):c:c:3):n:c:2:c:c:1.c1:c:c:c(-Cl):c:c:1"},
      {27, 30,
       "c1:c:c2:o:c(-c3:c:c(-NC(=O)-CSc4:c:c:c(-Cl):c:c:4):c:c:c:3):n:c:2:c:c:1"},
      {26, 28,
       "c1:c:c2:o:c(-c3:c:c(-NC(=O)-C):c(-C):c:c:3):n:c:2:c:c:1.c1:c:c:c:c:c:1"},
      {26, 29,
       "c1:c:c2:o:c(-c3:c:c(-NC(=O)-CSc4:c:c:c:c:c:4):c:c:c:3):n:c:2:c:c:1"},
      {26, 28,
       "c1:c:c2:n:c(-c3:c:c(-NC(=O)-C):c:c:c:3):o:c:2:c:c:1.c1:c:c:c(-Cl):c:c:1"},
      {28, 30,
       "COc1:c:c2:n:c(-c3:c:c(-NC(=O)-C):c(-C):c:c:3):o:c:2:c:c:1.c1:c:c:c:c:c:1"},
      {25, 27,
       "c1:c:c2:n:c(-c3:c:c(-NC(=O)-C):c:c:c:3):o:c:2:c:c:1.c1:c:c:c:c:c:1"},
      {25, 27,
       "c1:c(-NC(=O)-C):c:c:c:c:1-c1:n:c2:c:c:c:c:c:2:o:1.c1:c:c:c:c:c:1"},
      {26, 29,
       "c1:c(-NC(=O)-CSc2:c:c:c:c:c:2):c:c:c:c:1-c1:n:c2:c:c:c:c:c:2:o:1"},
      {26, 28,
       "c1:c:c:c2:o:c(-c3:c:c:c:c(-NC(=O)-C):c:3):n:c:2:c:1.c1:c:c(-C):c:c:c:1"}};
  size_t k = 0;
  for (size_t i = 0; i < mols.size() - 1; ++i) {
    for (size_t j = i + 1; j < mols.size(); ++j, ++k) {
      auto res = rascalMCES(*mols[i], *mols[j], opts);
      check_smarts_ok(*mols[i], *mols[j], res.front());
      REQUIRE(res.front().getAtomMatches().size() == std::get<0>(exp_res[k]));
      REQUIRE(res.front().getBondMatches().size() == std::get<1>(exp_res[k]));
      REQUIRE(res.front().getSmarts() == std::get<2>(exp_res[k]));
    }
  }
}

TEST_CASE("FMCS test3") {
  std::vector<std::shared_ptr<RDKit::ROMol>> mols{
      {"CN(C)c1ccc(CC(=O)NCCCCCCCCCCNC23CC4CC(C2)CC(C3)C4)cc1 CHEMBL153934"_smiles},
      {"CN(C)c1ccc(CC(=O)NCCCCCCCNC23CC4CC(C2)CC(C3)C4)cc1 CHEMBL152361"_smiles},
      {"CN(C)c1ccc(CC(=O)NCCCCCCCCCCCCNC23CC4CC(C2)CC(C3)C4)cc1 CHEMBL157336"_smiles},
      {"CN(C)c1ccc(CC(=O)NCCCCCCCCCNC23CC4CC(C2)CC(C3)C4)cc1 CHEMBL157429"_smiles},
      {"CN(C)c1ccc(CC(=O)NCCCCCCCCNC23CC4CC(C2)CC(C3)C4)cc1 CHEMBL357551"_smiles},
      {"CN(C)c1ccc(CC(=O)NCCCCCCCCCCCNC23CC4CC(C2)CC(C3)C4)cc1 CHEMBL421974"_smiles},
      {"CN(C)c1ccc(CC(NCCCCCC(NO)=O)=O)cc1 CHEMBL484488"_smiles},
      {"CC(C)Cc1ccc(C(C)C(=O)NC23CC4CC(C2)CC(C3)C4)cc1 CHEMBL564780"_smiles},
      {"c1cc([N+]([O-])=O)ccc1CC(=O)NC1CCCCCC1 CHEMBL1553142"_smiles},
      {"CC1(C)NC(C)(C)CC(NC(=O)Cc2ccccc2)C1 CHEMBL1703640"_smiles},
  };
  RascalOptions opts;
  opts.similarityThreshold = 0.1;
  // Because different compilers can give different equivalent results,
  // get all MCESs, which should then be sorted into a consistent order
  // so the first one should always be the same.  This results in extra
  // run time, but means the tests should work on all platforms.
  //  opts.allBestMCESs = true;
  std::vector<std::tuple<unsigned int, unsigned int, std::string>> exp_res{
      {31, 33,
       "CN(-C)-c1:c:c:c(-CC(=O)-NCCCCCCC):c:c:1.NC12CC3CC(-C1)-CC(-C2)-C3"},
      {34, 36,
       "CN(-C)-c1:c:c:c(-CC(=O)-NCCCCCCCCCC):c:c:1.NC12CC3CC(-C1)-CC(-C2)-C3"},
      {33, 35,
       "CN(-C)-c1:c:c:c(-CC(=O)-NCCCCCCCCC):c:c:1.NC12CC3CC(-C1)-CC(-C2)-C3"},
      {32, 34,
       "CN(-C)-c1:c:c:c(-CC(=O)-NCCCCCCCC):c:c:1.NC12CC3CC(-C1)-CC(-C2)-C3"},
      {34, 36,
       "CN(-C)-c1:c:c:c(-CC(=O)-NCCCCCCCCCC):c:c:1.NC12CC3CC(-C1)-CC(-C2)-C3"},
      {19, 19, "CN(-C)-c1:c:c:c(-CC(=O)-NCCCCCC):c:c:1"},
      {24, 25, "c1:c:c:c(-C):c:c:1.CCC.CCCNC12CC3CC(-C1)-CC(-C2)-C3"},
      {18, 18, "Nc1:c:c:c(-CC(=O)-NCCCCCCC):c:c:1"},
      {19, 18, "c1:c:c:c(-CC(=O)-NCCCC):c:c:1.NC(-C)(-C)-C"},
      {31, 33,
       "CN(-C)-c1:c:c:c(-CC(=O)-NCCCCCCC):c:c:1.NC12CC3CC(-C1)-CC(-C2)-C3"},
      {31, 33,
       "CN(-C)-c1:c:c:c(-CC(=O)-NCCCCCCC):c:c:1.NC12CC3CC(-C1)-CC(-C2)-C3"},
      {31, 33,
       "CN(-C)-c1:c:c:c(-CC(=O)-NCCCCCCC):c:c:1.NC12CC3CC(-C1)-CC(-C2)-C3"},
      {31, 33,
       "CN(-C)-c1:c:c:c(-CC(=O)-NCCCCCCC):c:c:1.NC12CC3CC(-C1)-CC(-C2)-C3"},
      {19, 19, "CN(-C)-c1:c:c:c(-CC(=O)-NCCCCCC):c:c:1"},
      {24, 25, "c1:c:c:c(-C):c:c:1.CCC.CCCNC12CC3CC(-C1)-CC(-C2)-C3"},
      {18, 18, "Nc1:c:c:c(-CC(=O)-NCCCCCCC):c:c:1"},
      {19, 18, "c1:c:c:c(-CC(=O)-NCCCC):c:c:1.NC(-C)(-C)-C"},
      {33, 35,
       "CN(-C)-c1:c:c:c(-CC(=O)-NCCCCCCCCC):c:c:1.NC12CC3CC(-C1)-CC(-C2)-C3"},
      {32, 34,
       "CN(-C)-c1:c:c:c(-CC(=O)-NCCCCCCCC):c:c:1.NC12CC3CC(-C1)-CC(-C2)-C3"},
      {35, 37,
       "CN(-C)-c1:c:c:c(-CC(=O)-NCCCCCCCCCCC):c:c:1.NC12CC3CC(-C1)-CC(-C2)-C3"},
      {19, 19, "CN(-C)-c1:c:c:c(-CC(=O)-NCCCCCC):c:c:1"},
      {24, 25, "c1:c:c:c(-C):c:c:1.CCC.CCCNC12CC3CC(-C1)-CC(-C2)-C3"},
      {18, 18, "Nc1:c:c:c(-CC(=O)-NCCCCCCC):c:c:1"},
      {19, 18, "c1:c:c:c(-CC(=O)-NCCCC):c:c:1.NC(-C)(-C)-C"},
      {32, 34,
       "CN(-C)-c1:c:c:c(-CC(=O)-NCCCCCCCC):c:c:1.NC12CC3CC(-C1)-CC(-C2)-C3"},
      {33, 35,
       "CN(-C)-c1:c:c:c(-CC(=O)-NCCCCCCCCC):c:c:1.NC12CC3CC(-C1)-CC(-C2)-C3"},
      {19, 19, "CN(-C)-c1:c:c:c(-CC(=O)-NCCCCCC):c:c:1"},
      {24, 25, "c1:c:c:c(-C):c:c:1.CCC.CCCNC12CC3CC(-C1)-CC(-C2)-C3"},
      {18, 18, "Nc1:c:c:c(-CC(=O)-NCCCCCCC):c:c:1"},
      {19, 18, "c1:c:c:c(-CC(=O)-NCCCC):c:c:1.NC(-C)(-C)-C"},
      {32, 34,
       "CN(-C)-c1:c:c:c(-CC(=O)-NCCCCCCCC):c:c:1.NC12CC3CC(-C1)-CC(-C2)-C3"},
      {19, 19, "CN(-C)-c1:c:c:c(-CC(=O)-NCCCCCC):c:c:1"},
      {24, 25, "c1:c:c:c(-C):c:c:1.CCC.CCCNC12CC3CC(-C1)-CC(-C2)-C3"},
      {18, 18, "Nc1:c:c:c(-CC(=O)-NCCCCCCC):c:c:1"},
      {19, 18, "c1:c:c:c(-CC(=O)-NCCCC):c:c:1.NC(-C)(-C)-C"},
      {19, 19, "CN(-C)-c1:c:c:c(-CC(=O)-NCCCCCC):c:c:1"},
      {24, 25, "c1:c:c:c(-C):c:c:1.CCC.CCCNC12CC3CC(-C1)-CC(-C2)-C3"},
      {18, 18, "Nc1:c:c:c(-CC(=O)-NCCCCCCC):c:c:1"},
      {19, 18, "c1:c:c:c(-CC(=O)-NCCCC):c:c:1.NC(-C)(-C)-C"},
      {16, 16, "c1:c:c:c(-CC(-NCCCCCC)=O):c:c:1"},
      {18, 17, "c1:c:c:c(-CC(-NCCCCCC)=O):c:c:1.NO"},
      {17, 16, "c1:c:c:c(-CC(-NCCCC)=O):c:c:1.CCN"},
      {17, 17, "c1:c:c:c(-CC(=O)-NC(-CCCCC)-C):c:c:1"},
      {18, 18, "c1:c:c:c(-CC(=O)-NC(-CC(-C)-C)-CCC):c:c:1"},
      {17, 17, "c1:c:c:c:c:c:1-CC(=O)-NC(-CCC)-CCC"}};
  size_t k = 0;
  for (size_t i = 0; i < mols.size() - 1; ++i) {
    for (size_t j = i + 1; j < mols.size(); ++j, ++k) {
      auto res = rascalMCES(*mols[i], *mols[j], opts);
      check_smarts_ok(*mols[i], *mols[j], res.front());
      REQUIRE(res.front().getAtomMatches().size() == std::get<0>(exp_res[k]));
      REQUIRE(res.front().getBondMatches().size() == std::get<1>(exp_res[k]));
      REQUIRE(res.front().getSmarts() == std::get<2>(exp_res[k]));
    }
  }
}

TEST_CASE("Zinc pair", "[basics]") {
  // These missed the pyrazole ring at one point, giving the SMARTS
  // NC(=O)-Nc1cccc2c1C(=O)-cc-2.c-c
  auto m1 = "NC(=O)Nc1cccc2c1C(=O)c1c-2n[nH]c1-c1cccs1 ZINC03814477"_smiles;
  REQUIRE(m1);
  auto m2 =
      "COc1ccc(-c2[nH]nc3c2C(=O)c2c(NC(N)=O)cccc2-3)cc1 ZINC00023904"_smiles;
  REQUIRE(m2);

  auto res = rascalMCES(*m1, *m2);
  REQUIRE(res.front().getSmarts() ==
          "NC(=O)-Nc1:c:c:c:c2:c:1-C(=O)-c1:c-2:n:n:c:1-c");
}

TEST_CASE("Largest frags only") {
  auto m1 = "CCCC(=O)NCCC1CCc2c(OC)ccc3ccc(OC)c1c23"_smiles;
  REQUIRE(m1);
  auto m2 = "CCCC(=O)NCCCc1cc(OC)ccc1OCc2ccccc2"_smiles;
  REQUIRE(m2);

  auto res = rascalMCES(*m1, *m2);
  REQUIRE(res.size() == 1);
  REQUIRE(res.front().getNumFrags() == 4);
  REQUIRE(res.front().getSmarts() ==
          "CCCC(=O)-NCCC-[#6].Cc1:c:c:c:c:c:1.O-[#6].c:c:c(-OC):c");
  res.front().largestFragsOnly();
  REQUIRE(res.front().getNumFrags() == 2);
  REQUIRE(res.front().getSmarts() == "CCCC(=O)-NCCC-[#6].Cc1:c:c:c:c:c:1");

  res.front().largestFragOnly();
  REQUIRE(res.front().getNumFrags() == 1);
  REQUIRE(res.front().getSmarts() == "CCCC(=O)-NCCC-[#6]");
}

TEST_CASE("Trim small frags") {
  auto m1 = "CCCC(=O)NCCC1CCc2c(OC)ccc3ccc(OC)c1c23"_smiles;
  REQUIRE(m1);
  auto m2 = "CCCC(=O)NCCCc1cc(OC)ccc1OCc2ccccc2"_smiles;
  REQUIRE(m2);

  RascalOptions opts;
  opts.ringMatchesRingOnly = true;
  auto res = rascalMCES(*m1, *m2);
  REQUIRE(res.size() == 1);
  REQUIRE(res.front().getNumFrags() == 4);
  REQUIRE(res.front().getSmarts() ==
          "CCCC(=O)-NCCC-[#6].Cc1:c:c:c:c:c:1.O-[#6].c:c:c(-OC):c");
  res.front().trimSmallFrags();
  REQUIRE(res.front().getNumFrags() == 3);
  REQUIRE(res.front().getSmarts() ==
          "CCCC(=O)-NCCC-[#6].Cc1:c:c:c:c:c:1.c:c:c(-OC):c");

  res.front().trimSmallFrags(7);
  REQUIRE(res.front().getNumFrags() == 2);
  REQUIRE(res.front().getSmarts() == "CCCC(=O)-NCCC-[#6].Cc1:c:c:c:c:c:1");
}

TEST_CASE("Exact Connection Matches", "[basics]") {
  {
    auto m1 = "c1ccccc1OC(=O)C(N)N"_smiles;
    REQUIRE(m1);
    auto m2 = "c1ccccc1SC(=O)C2NCC(CN2)C(=O)C(N)N"_smiles;
    REQUIRE(m2);

    RascalOptions opts;
    opts.similarityThreshold = 0.1;
    opts.allBestMCESs = true;
    auto res1 = rascalMCES(*m1, *m2, opts);
    CHECK(res1.front().getNumFrags() == 2);
    CHECK(res1.front().getSmarts() == "c1:c:c:c:c:c:1.C(=O)-C(-N)-N");
    auto q1 = v2::SmilesParse::MolFromSmarts(res1.front().getSmarts());
    std::vector<MatchVectType> smarts_res;
    SubstructMatch(*m1, *q1, smarts_res);
    CHECK(smarts_res.size() == 1);
    // There are 2 equivalent MCESs for the 2nd molecule, so 2 SMARTS matches.
    SubstructMatch(*m2, *q1, smarts_res);
    CHECK(smarts_res.size() == 2);

    opts.exactConnectionsMatch = true;
    auto res2 = rascalMCES(*m1, *m2, opts);
    CHECK(res2.front().getNumFrags() == 2);
    CHECK(res2.front().getSmarts() ==
          "[#6&a&D2]1:[#6&a&D2]:[#6&a&D2]:[#6&a&D2]:[#6&a&D2]:[#6&a&D3]:1."
          "[#6&A&D3](=[#8&A&D1])-[#6&A&D3](-[#7&A&D1])-[#7&A&D1]");
    auto q2 = v2::SmilesParse::MolFromSmarts(res2.front().getSmarts());
    SubstructMatch(*m1, *q2, smarts_res);
    CHECK(smarts_res.size() == 1);
    // With the exactConnectionsMatch option, only the amide group
    // furthest from the phenyl is a match.
    SubstructMatch(*m2, *q2, smarts_res);
    CHECK(smarts_res.size() == 1);
  }
  {
    // The original implementation had a crappy order-dependence bug such
    // that m1, m2 gave 12 bonds in the MCES but m3, m2 gave 10.
    // They are both the same molecules.
    auto m1 = "c1cccc(Cc2cccnc2)c1"_smiles;
    REQUIRE(m1);
    auto m2 = "c1ncccc1Oc1ccccc1"_smiles;
    REQUIRE(m2);
    RascalOptions opts;
    opts.similarityThreshold = 0.5;
    opts.allBestMCESs = false;
    opts.exactConnectionsMatch = true;

    auto res1 = rascalMCES(*m1, *m2, opts);
    CHECK(res1.front().getBondMatches().size() == 12);

    auto m3 = "c1ncccc1Cc1ccccc1"_smiles;
    REQUIRE(m3);

    auto res2 = rascalMCES(*m3, *m2, opts);
    CHECK(res2.front().getBondMatches().size() == 12);

    // and try really hard to break it.
    SmilesWriteParams params;
    params.doRandom = true;
    for (int i = 0; i < 100; ++i) {
      auto m3 = v2::SmilesParse::MolFromSmiles(MolToSmiles(*m1, params));
      REQUIRE(m3);
      auto m4 = v2::SmilesParse::MolFromSmiles(MolToSmiles(*m2, params));
      REQUIRE(m4);
      auto res2 = rascalMCES(*m3, *m4, opts);
      CHECK(res2.front().getBondMatches().size() == 12);
    }
  }
}

TEST_CASE("Equivalent atoms") {
  {
    auto m1 = "c1cc(Br)ccc1F"_smiles;
    REQUIRE(m1);
    auto m2 = "c1cc(I)ccc1Cl"_smiles;
    REQUIRE(m2);

    RascalOptions opts;
    opts.similarityThreshold = 0.5;
    opts.equivalentAtoms = "[F,Cl,Br,I]";
    auto res = rascalMCES(*m1, *m2, opts);
    REQUIRE(res.size() == 1);
    CHECK(res.front().getAtomMatches().size() == 8);
    CHECK(res.front().getSmarts() ==
          "c1:c:c(-[F,Cl,Br,I]):c:c:c:1-[F,Cl,Br,I]");
    check_smarts_ok(*m1, *m2, res.front());
  }
  {
    auto m1 = "c1cc(Br)ccc1F"_smiles;
    REQUIRE(m1);
    auto m2 = "c1ncccc1Cl"_smiles;
    REQUIRE(m2);

    RascalOptions opts;
    opts.similarityThreshold = 0.5;
    opts.equivalentAtoms = "[F,Cl,Br,I] [c,n]";
    auto res = rascalMCES(*m1, *m2, opts);
    REQUIRE(res.size() == 1);
    CHECK(res.front().getAtomMatches().size() == 7);
    CHECK(res.front().getSmarts() ==
          "[c,n]1:[c,n]:[c,n]:[c,n]:[c,n]:[c,n]:1-[F,Cl,Br,I]");
    check_smarts_ok(*m1, *m2, res.front());
  }
  {
    auto m1 = "c1ccccc1"_smiles;
    REQUIRE(m1);
    auto m2 = "c1nc(I)ccc1Cl"_smiles;
    REQUIRE(m2);

    RascalOptions opts;
    opts.similarityThreshold = 0.5;
    opts.equivalentAtoms = "[*]";
    auto res = rascalMCES(*m1, *m2, opts);
    REQUIRE(res.size() == 1);
    CHECK(res.front().getAtomMatches().size() == 6);
    CHECK(res.front().getSmarts() == "[*]1:[*]:[*]:[*]:[*]:[*]:1");
    check_smarts_ok(*m1, *m2, res.front());
  }
  {
    auto m1 = "c1ccccc1"_smiles;
    REQUIRE(m1);
    auto m2 = "c1nc(I)ccc1Cl"_smiles;
    REQUIRE(m2);

    RascalOptions opts;
    opts.similarityThreshold = 0.5;
    // Nonsense options, to check that too many exits correctly.
    opts.equivalentAtoms = "[*] [*] [*] [*] [*] [*] [*] [*] [*] [*] [*] ";
    CHECK_THROWS_AS(rascalMCES(*m1, *m2, opts), ValueErrorException);
  }
}

TEST_CASE("Equivalent bonds") {
  {
    auto m1 = "CC=CC"_smiles;
    REQUIRE(m1);
    auto m2 = "CCCC"_smiles;
    REQUIRE(m2);

    RascalOptions opts;
    opts.similarityThreshold = 0.5;
    opts.ignoreBondOrders = true;
    auto res = rascalMCES(*m1, *m2, opts);
    REQUIRE(res.size() == 1);
    CHECK(res.front().getAtomMatches().size() == 4);
    CHECK(res.front().getBondMatches().size() == 3);
    CHECK(res.front().getSmarts() == "C~C~C~C");
    check_smarts_ok(*m1, *m2, res.front());
  }
  {
    auto m1 = "C1NC(C(=O)O)CCC1"_smiles;
    REQUIRE(m1);
    auto m2 = "c1ccnc(C(=O)O)c1"_smiles;
    REQUIRE(m2);

    RascalOptions opts;
    opts.similarityThreshold = 0.5;
    opts.equivalentAtoms = "[#6,#7]";
    opts.ignoreBondOrders = true;
    auto res = rascalMCES(*m1, *m2, opts);
    REQUIRE(res.size() == 1);
    CHECK(res.front().getAtomMatches().size() == 9);
    CHECK(res.front().getBondMatches().size() == 9);
    CHECK(res.front().getSmarts() ==
          "[#6,#7]1~[#6,#7]~[#6,#7](~[#6,#7](~O)~O)~[#6,#7]~[#6,#7]~[#6,#7]~1");
    check_smarts_ok(*m1, *m2, res.front());
  }
}

TEST_CASE("Atom aromaticity match") {
  // The first 2 tests give the results they do because the flag
  // says to ignore _atom_ aromaticity, but it still takes into
  // account _bond_ aromaticity.  It's so that the C-N bond
  // matches in both cases in the first test.
  {
    auto m1 = "c1ccccc1NCC"_smiles;
    REQUIRE(m1);
    auto m2 = "C1CCCCC1NCC"_smiles;
    REQUIRE(m2);

    RascalOptions opts;
    opts.similarityThreshold = 0.1;
    opts.ignoreAtomAromaticity = true;
    auto res = rascalMCES(*m1, *m2, opts);
    REQUIRE(res.size() == 1);
    CHECK(res.front().getAtomMatches().size() == 4);
    CHECK(res.front().getBondMatches().size() == 3);
    CHECK(res.front().getSmarts() == "[#6]-NCC");
    check_smarts_ok(*m1, *m2, res.front());
  }
  {
    auto m1 = "c1ccccc1NCC"_smiles;
    REQUIRE(m1);
    auto m2 = "C1CCCCC1NCC"_smiles;
    REQUIRE(m2);

    RascalOptions opts;
    opts.similarityThreshold = 0.1;
    opts.ignoreAtomAromaticity = false;
    auto res = rascalMCES(*m1, *m2, opts);
    REQUIRE(res.size() == 1);
    CHECK(res.front().getAtomMatches().size() == 3);
    CHECK(res.front().getBondMatches().size() == 2);
    CHECK(res.front().getSmarts() == "NCC");
    check_smarts_ok(*m1, *m2, res.front());
  }
}

TEST_CASE("Aromatic fragment match") {
  v2::SmilesParse::SmilesParserParams params;
  params.sanitize = false;

  auto m1 = v2::SmilesParse::MolFromSmiles("[1*]c([3*])nc[2*]", params);
  REQUIRE(m1);
  auto m2 = v2::SmilesParse::MolFromSmiles("[1*]c([3*])nc[2*]", params);
  REQUIRE(m2);

  RascalOptions opts;
  auto res = rascalMCES(*m1, *m2, opts);
  REQUIRE(res.size() == 1);
  CHECK(res.front().getAtomMatches().size() == 6);
  CHECK(res.front().getBondMatches().size() == 5);
}

TEST_CASE("Empty results bug") {
  // These 2 molecules gave an empty results object even
  // when told not to.
  auto m1 = "Cc1nnc(NC(=O)C(=O)NCCc2c[nH]c3ccccc23)s1"_smiles;
  REQUIRE(m1);
  auto m2 = "Cc1ccc2c(C(=O)NCc3cncs3)n[nH]c2c1"_smiles;
  REQUIRE(m2);

  RascalOptions opts;
  opts.returnEmptyMCES = true;
  auto res = rascalMCES(*m1, *m2, opts);
  REQUIRE(!res.empty());
}

TEST_CASE("Order of atoms in bond labels must be consistent - Github 8198.") {
  {
    auto m1 = "c1ccccc1C"_smiles;
    REQUIRE(m1);
    auto m2 = "c1ccccc1C2CC2"_smiles;
    REQUIRE(m2);

    RascalOptions opts;
    opts.similarityThreshold = 0.1;
    opts.ignoreAtomAromaticity = false;
    auto res = rascalMCES(*m1, *m2, opts);
    REQUIRE(res.size() == 1);
    CHECK(res.front().getAtomMatches().size() == 7);
    CHECK(res.front().getBondMatches().size() == 7);
    CHECK(res.front().getSmarts() == "c1:c:c:c:c:c:1-C");
    check_smarts_ok(*m1, *m2, res.front());
  }
  {
    auto m1 = "Cc1ccc(C2=NN(C(N)=S)C(c3ccc(F)cc3)C2)cc1C"_smiles;
    REQUIRE(m1);
    auto m2 = "CC(=O)N1N=C(c2ccc(C)c(C)c2)CC1c1ccc(F)cc1"_smiles;
    REQUIRE(m2);

    RascalOptions opts;
    opts.similarityThreshold = 0.1;
    opts.ignoreAtomAromaticity = false;
    auto res = rascalMCES(*m1, *m2, opts);
    REQUIRE(res.size() == 1);
    CHECK(res.front().getAtomMatches().size() == 21);
    CHECK(res.front().getBondMatches().size() == 23);
    CHECK(res.front().getSmarts() ==
          "Cc1:c:c:c(-C2=NN(-C)-C(-c3:c:c:c(-F):c:c:3)-C2):c:c:1-C");
    check_smarts_ok(*m1, *m2, res.front());
  }
}

TEST_CASE(
    "Github 8246 - equivalentAtoms SMARTS not translated back in the SMARTS string") {
  auto m1 = "COC1=CC2(Oc3ccc(-c4ccc(OC)c(OC)c4)cc3C2=O)C(OC)=CC1O"_smiles;
  REQUIRE(m1);
  auto m2 = "COC1=CC2(Oc3ccc(-c4ccccc4)cc3C2=O)C(OC)=CC1O"_smiles;
  REQUIRE(m2);
  RascalOptions opts;
  opts.equivalentAtoms = "[O,S]";
  opts.ringMatchesRingOnly = true;
  auto res = rascalMCES(*m1, *m2, opts);
  REQUIRE(!res.empty());
  CHECK(
      res.front().getSmarts() ==
      "C-[O,S]-[C&R]1=&@[C&R]-&@[C&R]2(-&@[O,S;R]-&@c3:c:c:c(-c4:c:c:c:c:c:4):c:c:3-&@[C&R]-&@2=[O,S])-&@[C&R](-[O,S]-C)=&@[C&R]-&@[C&R]-&@1-[O,S]");
  check_smarts_ok(*m1, *m2, res.front());
}

TEST_CASE("Specify minimum clique size directly.") {
  auto m1 = "CC12CCC3C(C1CCC2O)CCC4=CC(=O)CCC34C"_smiles;
  REQUIRE(m1);
  auto m2 = "CC12CCC3C(C1CCC2O)CCC4=C3C=CC(=C4)O"_smiles;
  REQUIRE(m2);

  RascalOptions opts;
  opts.similarityThreshold = 0.6;
  opts.minCliqueSize = 15;
  auto res1 = rascalMCES(*m1, *m2, opts);
  REQUIRE(res1.size() == 1);
  CHECK(res1.front().getBondMatches().size() == 16);
  opts.minCliqueSize = 17;
  auto res2 = rascalMCES(*m1, *m2, opts);
  REQUIRE(res2.empty());
}

TEST_CASE("Duplicate Single Largest Frag") {
  {
    auto m1 = "c1ccc2c(c1)c(ncn2)CNCc3ccc(cc3)Cl"_smiles;
    REQUIRE(m1);
    auto m2 = "c1ccc2c(c1)c(ncn2)CCCc3ccc(cc3)Cl"_smiles;
    REQUIRE(m2);
    RascalOptions opts;
    opts.singleLargestFrag = true;
    opts.allBestMCESs = true;
    opts.timeout = -1;
    auto res = rascalMCES(*m1, *m2, opts);
    REQUIRE(res.size() == 1);
    CHECK(res.front().getAtomMatches().size() == 11);
    CHECK(res.front().getBondMatches().size() == 12);
  }
  {
    // Without the fix, there were 156 results sets, with different breaks
    // in the long chain giving different numbers of atoms in the largest
    // fragment.
    auto m1 = "CN(C)c1ccc(CC(=O)NCCCCCCCCCCNC23CC4CC(C2)CC(C3)C4)cc1"_smiles;
    REQUIRE(m1);
    auto m2 = "CN(C)c1ccc(CC(=O)NCCCCCCCCCCCCNC23CC4CC(C2)CC(C3)C4)cc1"_smiles;
    REQUIRE(m2);
    RascalOptions opts;
    opts.singleLargestFrag = true;
    opts.allBestMCESs = true;
    opts.timeout = -1;
    auto res = rascalMCES(*m1, *m2, opts);
    REQUIRE(!res.empty());
    CHECK(res.size() == 4);
    CHECK(res.front().getAtomMatches().size() == 23);
    CHECK(res.front().getBondMatches().size() == 23);
    CHECK(res.back().getAtomMatches().size() == 23);
    CHECK(res.back().getBondMatches().size() == 23);
  }
}

TEST_CASE("Github8255 - incorrect MCES with singleLargestFrag=true") {
  RascalOptions opts;
  opts.singleLargestFrag = true;
  opts.allBestMCESs = true;
  opts.ignoreAtomAromaticity = true;
  opts.ringMatchesRingOnly = true;
  opts.completeAromaticRings = false;
  {
    auto m1 = "Cc1ccc(cn1)-c1ccc(cn1)-c1ccc2ccccc2n1"_smiles;
    REQUIRE(m1);
    auto m2 = "Cc1ccc(cn1)-c1ccc(cn1)-c1cc2ccccc2[nH]1"_smiles;
    REQUIRE(m2);
    auto res = rascalMCES(*m1, *m2, opts);
    CHECK(res.size() == 3);
    for (auto &r : res) {
      CHECK(r.getAtomMatches().size() == 22);
      CHECK(r.getBondMatches().size() == 24);
    }
  }
  {
    auto m1 = "Cc1ncc(cc1)c2ncc(cc2)c3ccc4c(c3)cn[nH]4"_smiles;
    REQUIRE(m1);
    auto m2 = "Cc1ncc(cc1)c2ncc(cc2)c3ccc4c(c3)nccn4"_smiles;
    REQUIRE(m2);
    auto res = rascalMCES(*m1, *m2, opts);
    CHECK(res.size() == 2);
    for (auto &r : res) {
      CHECK(r.getAtomMatches().size() == 20);
      CHECK(r.getBondMatches().size() == 22);
    }
  }
}

TEST_CASE("Github8360 - another incorrect MCES with singleLargestFrag=true") {
  RascalOptions opts;
  opts.singleLargestFrag = true;
  opts.allBestMCESs = true;
  opts.completeAromaticRings = false;
  {
    auto m2 = "c1ccc(cn1)-c1ccc2ccccc2n1"_smiles;
    REQUIRE(m2);
    auto m1 = "c1ccc(cn1)-c1cc2ccccc2[nH]1"_smiles;
    REQUIRE(m1);
    auto res = rascalMCES(*m1, *m2, opts);
    CHECK(res.size() == 3);
    for (auto &r : res) {
      CHECK(r.getAtomMatches().size() == 15);
      CHECK(r.getBondMatches().size() == 16);
    }
  }
  {
    auto m1 = "C=CCCC=CCCC1CNCCC1"_smiles;
    REQUIRE(m1);
    auto m2 = "C=CCC=CCCCC1CNCCC1"_smiles;
    REQUIRE(m2);
    auto res = rascalMCES(*m1, *m2, opts);
    REQUIRE(!res.empty());
    CHECK(res.size() == 1);
    for (auto &r : res) {
      CHECK(r.getAtomMatches().size() == 9);
      CHECK(r.getBondMatches().size() == 9);
    }
  }
}

TEST_CASE("Github8645 - memory blows up") {
  RascalOptions opts;
  opts.similarityThreshold = 0.3;
  opts.timeout = 10;
  opts.singleLargestFrag = true;
  auto m1 = "Fc1c(F)c(F)c(F)c(F)c1c1c(F)c(F)c(F)c(F)c1"_smiles;
  REQUIRE(m1);
  auto m2 = "FC1(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C1(F)(F)"_smiles;
  REQUIRE(m2);
  auto res = rascalMCES(*m1, *m2, opts);
  REQUIRE(res.size() == 1);
  CHECK(res.front().getBondMatches().size() == 1);
}