### Question:
ColumnInformation { protected boolean isIntegerValue(String value) { return value.matches("\\d+"); } 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 testIsIntegerValue() throws InputIterationException { ColumnInformation columnInformation = new ColumnInformation(this.columnName, this.columnIndex, new BitSet(), null, false); String trueInteger = "23413"; String falseInteger = "1l"; boolean isValid = columnInformation.isIntegerValue(trueInteger); assertTrue(isValid); isValid = columnInformation.isIntegerValue(falseInteger); assertFalse(isValid); }