### Question:
ConjunctionImpl implements Conjunction<T> { @Override public String toString() { return Serializer.getSerialization(serializer -> serializer.writeLiteralConjunction(this)); } ConjunctionImpl(List<? extends T> literals); @Override List<T> getLiterals(); @Override Stream<Term> getTerms(); @Override int hashCode(); @Override boolean equals(Object obj); @Override Iterator<T> iterator(); @Override String toString();  }### Answer:
@Test public void conjunctionToStringTest() { final Variable x = Expressions.makeUniversalVariable("X"); final Variable y = Expressions.makeUniversalVariable("Y"); final Constant c = Expressions.makeAbstractConstant("c"); final Constant d = Expressions.makeAbstractConstant("d"); final PositiveLiteral positiveLiteral1 = Expressions.makePositiveLiteral("p", x, c); final PositiveLiteral positiveLiteral2 = Expressions.makePositiveLiteral("p", y, x); final PositiveLiteral positiveLiteral3 = Expressions.makePositiveLiteral("q", x, d); final NegativeLiteral NegativeLiteral = Expressions.makeNegativeLiteral("r", x, d); final PositiveLiteral PositiveLiteral4 = Expressions.makePositiveLiteral("s", c, d); final List<Literal> LiteralList = Arrays.asList(positiveLiteral1, positiveLiteral2, positiveLiteral3, NegativeLiteral, PositiveLiteral4); final Conjunction<Literal> conjunction1 = new ConjunctionImpl<>(LiteralList); assertEquals("p(?X, c), p(?Y, ?X), q(?X, d), ~r(?X, d), s(c, d)", conjunction1.toString()); }