@Test
public void testFetchAllStudents_happypath() {
// Given
StudentDirectoryServiceImpl studentDirectoryService = new StudentDirectoryServiceImpl();
StudentDAO studentDAO = mock(StudentDAO.class);
studentDirectoryService.setStudentDAO(studentDAO);
List<Student> testStudents = new ArrayList<Student>();
Student testStudent1 = new Student();
testStudent1.setFirstName("Michael");
testStudent1.setLastName("Bluth");
testStudents.add(testStudent1);
Student testStudent2 = new Student();
testStudent2.setFirstName("Lindsay");
testStudent2.setLastName("Bluth");
testStudents.add(testStudent2);
when(studentDAO.fetchAllStudents()).thenReturn(testStudents);
// When
List<Student> students = studentDirectoryService.fetchAllStudents();
// Then
assertNotNull(students);
assertEquals(2, students.size());
assertEquals("Michael", students.get(0).getFirstName());
assertEquals("Lindsay", students.get(1).getFirstName());
}
