### Question:
ColumnInformation { protected boolean isBooleanValue(String value) { String[] commonNegativeDescriptorsArray = {"0", "false", "f", "no", "n"}; String[] commonPositiveDescriptorsArray = {"1", "true", "t", "yes", "y"}; Set<String> commonNegativeDescriptors = new HashSet<>(Arrays.asList(commonNegativeDescriptorsArray)); Set<String> commonPositiveDescriptors = new HashSet<>(Arrays.asList(commonPositiveDescriptorsArray)); return commonNegativeDescriptors.contains(value.toLowerCase()) || commonPositiveDescriptors.contains(value.toLowerCase()); } 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 testIsBooleanValue() throws InputIterationException { ColumnInformation columnInformation = new ColumnInformation(this.columnName, this.columnIndex, new BitSet(), null, false); String trueBoolean = "y"; String falseBoolean = "this is true"; boolean isValid = columnInformation.isBooleanValue(trueBoolean); assertTrue(isValid); isValid = columnInformation.isBooleanValue(falseBoolean); assertFalse(isValid); }