### Question:
UniqueColumnCombinationResult implements RankingResult { @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (obj == null) { return false; } if (getClass() != obj.getClass()) { return false; } UniqueColumnCombinationResult other = (UniqueColumnCombinationResult) obj; return this.result.equals(other.getResult()); } UniqueColumnCombinationResult();  UniqueColumnCombinationResult(UniqueColumnCombination result); UniqueColumnCombination getResult(); void setResult(UniqueColumnCombination result); ColumnCombination getColumnCombination(); String getTableName(); void setTableName(String tableName); float getColumnRatio(); void setColumnRatio(float columnRatio); float getOccurrenceRatio(); void setOccurrenceRatio(float occurrenceRatio); float getUniquenessRatio(); void setUniquenessRatio(float uniquenessRatio); float getRandomness(); void setRandomness(float randomness); @Override boolean equals(Object obj); @Override int hashCode();  }### Answer:
@Test public void testEquals() throws InputGenerationException, InputIterationException { ColumnIdentifier column1 = new ColumnIdentifier("table1", "column1"); ColumnIdentifier column2 = new ColumnIdentifier("table1", "column2"); UniqueColumnCombination result1 = new UniqueColumnCombination(column1, column2); UniqueColumnCombination result2 = new UniqueColumnCombination(column1); UniqueColumnCombinationResult rankingResult1 = new UniqueColumnCombinationResult(result1); UniqueColumnCombinationResult rankingResult2 = new UniqueColumnCombinationResult(result2); assertEquals(rankingResult1, rankingResult1); assertNotEquals(rankingResult1, rankingResult2); }