### Question:
Statistics { public void groupedValidation() { groupedValidations++; }  void add(Statistics statistics); void found(); void groupedValidation(); void invalid(); void newDeduced(); void notSupported(); void round(); void validated();  }### Answer:
@Test public void testGroupedValidations() { Statistics statistics = new Statistics(); assertThat(statistics.getGroupedValidations()).isEqualTo(0); statistics.groupedValidation(); assertThat(statistics.getGroupedValidations()).isEqualTo(1); }