### Question:
ColumnInformation { public boolean isUniqueColumn() { return this.getDistinctValuesCount() == this.getRowCount(); } ColumnInformation(String columnName, int columnIndex, BitSet bitSet);  ColumnInformation(String columnName, int columnIndex, BitSet bitSet,
                           RelationalInput relationalInput, boolean useDataDependentStatistics); boolean isUniqueColumn(); double getUniquenessRate(); double getNullRate(); long getInformationContent(long rows); String getColumnName(); long getDistinctValuesCount(); long getNullValuesCount(); ColumnType getColumnType(); Histogram getHistogram(); long getRowCount(); float getAverageValueLength(); BitSet getBitSet(); int getColumnIndex();  }### Answer:
@Test public void testIsUniqueColumn() throws InputIterationException, InputGenerationException { FileFixtureUniqueColumn fileFixture = new FileFixtureUniqueColumn(); FileIterator fileIterator = fileFixture.getTestData(); ColumnInformation columnInformation = new ColumnInformation(this.columnName, 0, new BitSet(), fileIterator, true); assertTrue(columnInformation.isUniqueColumn()); fileIterator = fileFixture.getTestData(); columnInformation = new ColumnInformation(this.columnName, 1, new BitSet(), fileIterator, true); assertFalse(columnInformation.isUniqueColumn()); }