### Question:
TermFactory { public LanguageStringConstant makeLanguageStringConstant(String string, String languageTag) { return new LanguageStringConstantImpl(string, languageTag); } TermFactory();  TermFactory(int cacheSize); UniversalVariable makeUniversalVariable(String name); ExistentialVariable makeExistentialVariable(String name); AbstractConstant makeAbstractConstant(String name); DatatypeConstant makeDatatypeConstant(String lexicalValue, String datatypeIri); LanguageStringConstant makeLanguageStringConstant(String string, String languageTag); Predicate makePredicate(String name, int arity);  }### Answer:
@Test public void languageConstant_succeeds() { TermFactory termFactory = new TermFactory(); Term term1 = termFactory.makeLanguageStringConstant("abc", "de"); Term term2 = new LanguageStringConstantImpl("abc", "de"); assertEquals(term1, term2); }