### Question:
EmployeeService { public List<Employee> allOlderThen20() { return this.employeeRepository.findAll(EmployeeSpecifications.olderThen20); } EmployeeService(EmployeeRepository employeeRepository); List<Employee> allOlderThen20(); List<Employee> allInFRIR(); List<Employee> allOlderThen20InFRIR(); List<Employee> byAgeAndMaybeOneOfDepartmentNames(EmployeeFilter employeeFilter);  }### Answer:
@Test public void test_getAllOlderThen20() { var olderThen20 = employeeService.allOlderThen20(); Assert.assertTrue(olderThen20.stream().allMatch(emp -> emp.getAge() > 20)); Assert.assertEquals(2, olderThen20.size()); }