@Test
public void testUpdateStudent_passnull() {
// Given
StudentDirectoryServiceImpl studentDirectoryService = new StudentDirectoryServiceImpl();
try {
// When
studentDirectoryService.updateStudent(null);
fail("An exception should have been thrown for a null value passed as a parameter.");
} catch (Exception e) {
// Then
assertTrue(e instanceof NullPointerException);
assertEquals("Unable to update a student. The student cannot be null.", e.getMessage());
}
}
@Test
public void testUpdateStudent_happypath() {
// Given
StudentDirectoryServiceImpl studentDirectoryService = new StudentDirectoryServiceImpl();
StudentDAO studentDAO = mock(StudentDAO.class);
studentDirectoryService.setStudentDAO(studentDAO);
Student testStudent = new Student();
testStudent.setFirstName("Michael");
testStudent.setLastName("Bluth");
// When
studentDirectoryService.updateStudent(testStudent);
// Then
ArgumentCaptor<Student> studentCaptor = ArgumentCaptor.forClass(Student.class);
verify(studentDAO, times(1)).updateStudent(studentCaptor.capture());
assertEquals("Michael", studentCaptor.getValue().getFirstName());
assertEquals("Bluth", studentCaptor.getValue().getLastName());
}
