单元测试mockito存储库返回空

Question

我正在测试dynamodb存储库。下面是测试的方法

public Book getBook(final String bookId) {
    DynamoDbTable<Book> bookTable = getTable();
    Key key = Key.builder().partitionValue(bookId)
        .build();
    return bookTable.getItem(key);
  }

  private DynamoDbTable<Book> getTable() {
    return dynamoDbEnhancedClient.table("Book",
        TableSchema.fromBean(Book.class));
  }

这是测试类

@ExtendWith(MockitoExtension.class)
@MockitoSettings(strictness = Strictness.LENIENT)
class BookRepositoryTest {

  @Mock
  private DynamoDbEnhancedClient dynamoDbEnhancedClient;
  @Mock
  private DynamoDbTable<Book> dyamoDbTable;
  @Mock
  private Key key;

  @InjectMocks
  private BookRepository repository;

  private final String BOOK_ID = "123";
  private static MockedStatic<TableSchema> tableSchema;

  @BeforeAll
  public static void init() {
    tableSchema = mockStatic(TableSchema.class);
  }

  @AfterAll
  public static void close() {
    tableSchema.close();
  }

  @Test
  void testGetBook() {
    Book book = HelperMethod.createBook();
    tableSchema.when(() -> TableSchema.fromBean(Book.class))
        .thenReturn(BeanTableSchema.create(Book.class));
    when(dynamoDbEnhancedClient.table("Book",
        TableSchema.fromBean(Book.class))).thenReturn(dyamoDbTable);
    when(dyamoDbTable.getItem(key)).thenReturn(book);
    final var result = repository.getBook(BOOK_ID);
    assertEquals(book, result);
  }

}

这是错误

org.opentest4j.AssertionFailedError:预期:Book(bookId=123，keyCode=testKeyCode，eventTimestampMs=123，value=true)实数:null

Answer 1

您从未模仿过dyamoDbTable (它似乎拼写错误)，所以它是null。而且，我不明白你为什么要嘲笑TableSchema.fromBean；看起来你可以这么做

when(dynamoDbEnhancedClient.table(anyString(), any())).thenReturn(dyamoDbTable)

如果你那样做了，你就不需要mockStatic了。