### Question:
Ducc implements UniqueColumnCombinationsAlgorithm, RelationalInputParameterAlgorithm,
                             BooleanParameterAlgorithm { @Override public void setBooleanConfigurationValue(String identifier, Boolean... values) throws AlgorithmConfigurationException { if (identifier.equals(NULL_EQUALS_NULL)) { this.nullEqualsNull = values[0]; } else { throw new AlgorithmConfigurationException("Operation should not be called"); } } Ducc(); @Override ArrayList<ConfigurationRequirement<?>> getConfigurationRequirements(); @Override void setRelationalInputConfigurationValue(String identifier, RelationalInputGenerator... values); @Override void execute(); @Override void setResultReceiver(UniqueColumnCombinationResultReceiver receiver); @Override void setBooleanConfigurationValue(String identifier, Boolean... values); @Override String getAuthors(); @Override String getDescription();  }### Answer:
@Test public void testSetConfigurationValueNullEqualsNull() throws AlgorithmConfigurationException { boolean nullEqualsNull = false; ducc.setBooleanConfigurationValue(Ducc.NULL_EQUALS_NULL, nullEqualsNull); assertEquals(nullEqualsNull, ducc.nullEqualsNull); }