@Test
public void testImportStudents() throws Exception {
// Given
StudentDirectoryServiceImpl studentDirectoryService = new StudentDirectoryServiceImpl();
StudentDAO studentDAO = mock(StudentDAO.class);
studentDirectoryService.setStudentDAO(studentDAO);
MultipartFile multipartFile = mock(MultipartFile.class);
StringBuffer buffer = new StringBuffer();
buffer.append("Bart, Simpson\n");
buffer.append("Lisa, Simpson");
InputStream stream =
new ByteArrayInputStream(buffer.toString().getBytes(StandardCharsets.UTF_8));
when(multipartFile.getInputStream()).thenReturn(stream);
// When
studentDirectoryService.importStudents(multipartFile);
// Then
ArgumentCaptor<Student> studentCaptor = ArgumentCaptor.forClass(Student.class);
verify(studentDAO, times(2)).createStudent(studentCaptor.capture());
assertEquals("Bart", studentCaptor.getAllValues().get(0).getFirstName());
assertEquals("Simpson", studentCaptor.getAllValues().get(0).getLastName());
assertEquals("Lisa", studentCaptor.getAllValues().get(1).getFirstName());
assertEquals("Simpson", studentCaptor.getAllValues().get(1).getLastName());
}
@Test
public void testImportStudents_exception() throws Exception {
// Given
StudentDirectoryServiceImpl studentDirectoryService = new StudentDirectoryServiceImpl();
Logger logger = mock(Logger.class);
studentDirectoryService.setLogger(logger);
StudentDAO studentDAO = mock(StudentDAO.class);
studentDirectoryService.setStudentDAO(studentDAO);
MultipartFile multipartFile = mock(MultipartFile.class);
IOException exception = new IOException("This is a dummy IOException.");
when(multipartFile.getInputStream()).thenThrow(exception);
// When
studentDirectoryService.importStudents(multipartFile);
// Then
ArgumentCaptor<String> errorCaptor = ArgumentCaptor.forClass(String.class);
verify(logger, times(1)).error(errorCaptor.capture());
assertEquals(exception, errorCaptor.getValue());
}
@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());
}
@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());
}
