formatGroupHeader  
  open override fun formatGroupHeader(parameterObject: AssertionFormatterParameterObject, assertionGroup: AssertionGroup, newParameterObject: AssertionFormatterParameterObject)(source)
Formats the header (AssertionGroup.description and AssertionGroup.representation) of the given assertionGroup and appends the result to the sb of the given parameterObject.
Parameters
parameterObject 
The parameter object which contains inter alia the sb to which the result will be appended.
assertionGroup 
The AssertionGroup of which we want to format the header.
newParameterObject  
The AssertionFormatterParameterObject used for the AssertionGroup.assertions.