code: ///////////////////////////////////////////////////////////////////////////
  //                   __                _      _   ________               //
  //                  / /   ____  ____ _(_)____/ | / / ____/               //
  //                 / /   / __ \/ __ `/ / ___/  |/ / / __                 //
  //                / /___/ /_/ / /_/ / / /__/ /|  / /_/ /                 //
  //               /_____/\____/\__, /_/\___/_/ |_/\____/                  //
  //                           /____/                                      //
  //                                                                       //
  //               The Next Generation Logic Library                       //
  //                                                                       //
  ///////////////////////////////////////////////////////////////////////////
  //                                                                       //
  //  Copyright 2015-20xx Christoph Zengler                                //
  //                                                                       //
  //  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.                       //
  //                                                                       //
  ///////////////////////////////////////////////////////////////////////////
  
  package org.logicng.solvers.sat;
  
  import static org.assertj.core.api.Assertions.assertThat;
  
  import org.junit.jupiter.api.Test;
  import org.logicng.TestWithExampleFormulas;
  import org.logicng.solvers.maxsat.algorithms.MaxSATConfig;
  import org.logicng.util.FormulaRandomizerConfig;
  
  import java.util.Arrays;
  
  /**
   * Unit tests for the solver configurations.
   * @version 2.0.0
   * @since 1.0
   */
  public class ConfigurationsTest extends TestWithExampleFormulas {
  
      @Test
      public void testMiniSatConfigToString() {
          final MiniSatConfig config = MiniSatConfig.builder()
                  .varDecay(1.2)
                  .varInc(1.3)
                  .clMinimization(MiniSatConfig.ClauseMinimization.BASIC)
                  .restartFirst(200)
                  .restartInc(0.8)
                  .clauseDecay(0.92)
                  .removeSatisfied(true)
                  .lsFactor(1.4)
                  .lsInc(1.5)
                  .incremental(false)
                  .initialPhase(true)
                  .build();
          final String expected = String.format("MiniSatConfig{%n" +
                  "varDecay=1.2%n" +
                  "varInc=1.3%n" +
                  "clauseMin=BASIC%n" +
                  "restartFirst=200%n" +
                  "restartInc=0.8%n" +
                  "clauseDecay=0.92%n" +
                  "removeSatisfied=true%n" +
                  "learntsizeFactor=1.4%n" +
                  "learntsizeInc=1.5%n" +
                  "incremental=false%n" +
                  "initialPhase=true%n" +
                  "proofGeneration=false%n" +
                  "cnfMethod=PG_ON_SOLVER%n" +
                  "auxiliaryVariablesInModels=false%n" +
                  "bbInitialUBCheckForRotatableLiterals=true%n" +
                  "bbCheckForComplementModelLiterals=true%n" +
                  "bbCheckForRotatableLiterals=true%n" +
                  "}");
          assertThat(config.toString()).isEqualTo(expected);
      }
  
      @Test
      public void testGlucoseConfigToString() {
          final GlucoseConfig config = GlucoseConfig.builder()
                  .lbLBDMinimizingClause(3)
                  .lbLBDFrozenClause(25)
                  .lbSizeMinimizingClause(24)
                  .firstReduceDB(1999)
                  .specialIncReduceDB(999)
                  .incReduceDB(299)
                  .factorK(0.7)
                  .factorR(1.3)
                  .sizeLBDQueue(45)
                  .sizeTrailQueue(4999)
                  .reduceOnSize(true)
                  .reduceOnSizeSize(10)
                  .maxVarDecay(0.99)
                  .build();
          final String expected = String.format("GlucoseConfig{%n" +
                  "lbLBDMinimizingClause=3%n" +
                  "lbLBDFrozenClause=25%n" +
                  "lbSizeMinimizingClause=24%n" +
                  "firstReduceDB=1999%n" +
                  "specialIncReduceDB=999%n" +
                  "incReduceDB=299%n" +
                  "factorK=0.7%n" +
                  "factorR=1.3%n" +
                  "sizeLBDQueue=45%n" +
                  "sizeTrailQueue=4999%n" +
                  "reduceOnSize=true%n" +
                  "reduceOnSizeSize=10%n" +
                  "maxVarDecay=0.99%n" +
                  "}");
          assertThat(config.toString()).isEqualTo(expected);
      }
  
      @Test
      public void testMaxSATConfigToString() {
          final MaxSATConfig config = MaxSATConfig.builder()
                  .incremental(MaxSATConfig.IncrementalStrategy.ITERATIVE)
                  .cardinality(MaxSATConfig.CardinalityEncoding.MTOTALIZER)
                  .weight(MaxSATConfig.WeightStrategy.DIVERSIFY)
                  .solver(MaxSATConfig.SolverType.MINISAT)
                  .verbosity(MaxSATConfig.Verbosity.SOME)
                  .output(System.out)
                  .symmetry(false)
                  .limit(1000)
                  .bmo(false)
                  .build();
          final String expected = String.format("MaxSATConfig{%n" +
                  "incrementalStrategy=ITERATIVE%n" +
                  "pbEncoding=LADDER%n" +
                  "pbEncoding=SWC%n" +
                  "cardinalityEncoding=MTOTALIZER%n" +
                  "weightStrategy=DIVERSIFY%n" +
                  "solverType=MINISAT%n" +
                  "verbosity=SOME%n" +
                  "symmetry=false%n" +
                  "limit=1000%n" +
                  "bmo=false%n" +
                  "}");
          assertThat(config.toString()).isEqualTo(expected);
      }
  
      @Test
      public void testFormulaRandomizerConfigToString() {
          final FormulaRandomizerConfig config = FormulaRandomizerConfig.builder()
                  .seed(42)
                  .numVars(21)
                  .variables(Arrays.asList(this.A, this.B, this.C))
                  .build();
          final String expected = String.format("FormulaRandomizerConfig{%n" +
                  "seed=42%n" +
                  "variables=[a, b, c]%n" +
                  "numVars=21%n" +
                  "weightConstant=0.1%n" +
                  "weightPositiveLiteral=1.0%n" +
                  "weightNegativeLiteral=1.0%n" +
                  "weightOr=30.0%n" +
                  "weightAnd=30.0%n" +
                  "weightNot=1.0%n" +
                  "weightImpl=1.0%n" +
                  "weightEquiv=1.0%n" +
                  "maximumOperandsAnd=5%n" +
                  "maximumOperandsOr=5%n" +
                  "weightPbc=0.0%n" +
                  "weightPbcCoeffPositive=1.0%n" +
                  "weightPbcCoeffNegative=0.2%n" +
                  "weightPbcTypeLe=0.2%n" +
                  "weightPbcTypeLt=0.2%n" +
                  "weightPbcTypeGe=0.2%n" +
                  "weightPbcTypeGt=0.2%n" +
                  "weightPbcTypeEq=0.2%n" +
                  "maximumOperandsPbc=5%n" +
                  "maximumCoefficientPbc=10%n" +
                  "weightCc=0.0%n" +
                  "weightAmo=0.0%n" +
                  "weightExo=0.0%n" +
                  "maximumOperandsCc=5%n" +
                  "}"
          );
          assertThat(config.toString()).isEqualTo(expected);
      }
  }
  