Cobertura does not include results in test-coverage

[nito90]

Hi to all, I use maven plugin Cobertura 2.7. I want to test the below method.

protected void validateCategoryAndAssociatedQuestionType(CategoryQuestionDto dto, Category cat, Question que) {
		
if (!((cat instanceof TriviaCategory && que instanceof TriviaQuestion) || (cat instanceof TestCategory && que instanceof TestQuestion) || (cat instanceof GuessingGameCategory && que instanceof GuessingGameQuestion))) 
{
			
throw new QuestionAndCategoryNotOfTheSameTypeException("Question with id: " + dto.getId().getQuestionId() + " and Category with id: " + dto.getId().getCategoryId() + " are not of the same type");

}
}

and I am testing this with the below test.

@Test(expected = QuestionAndCategoryNotOfTheSameTypeException.class)
	
public void validateCategoryAndAssociatedQuestionTypeFailure6(){
		
                GuessingGameCategory category = new GuessingGameCategory();
		TestQuestion question = new TestQuestion();
		
                question.setId(1);
	        category.setId(1);

		CategoryQuestion pair = new CategoryQuestion(category, question, (short)1);
		service.validateCategoryAndAssociatedQuestionType(new  CategoryQuestionDto().fromEntity(pair), category, question);
	}
``` 

Can someone tell me why this method in coverage report is with red lines?