### Question:
UnnamedFieldsMapping implements FieldsMapping { public static UnnamedFieldsMapping mapping( int fieldsCount ) { return new UnnamedFieldsMapping( fieldsCount ); } UnnamedFieldsMapping( int fieldsCount ); @Override int fieldMetaIndex( int index ); @Override int size(); static UnnamedFieldsMapping mapping( int fieldsCount );  }### Answer:
@Test public void mapping() { UnnamedFieldsMapping mapping = UnnamedFieldsMapping.mapping( 2 ); assertEquals( 1, mapping.fieldMetaIndex( 1 ) ); }