我想仅在它提供了注释时才运行集成测试。问题是测试用例需要一些变量,这些变量需要在 @Before
中初始化并在 @After
中销毁。
我编写了执行已给出注释的测试的代码,但由于需要在@Before
阶段初始化变量,它们都失败了。
我首先调用@Before
阶段(我假设变量已初始化),然后运行测试方法,然后调用@After
阶段。但是我在测试方法上得到了NullPointerException
。
如何初始化测试方法的变量?调用@Before阶段还不够吗?
我拥有的代码:
public static void main(String[] args) throws Exception {
Class<TodoMapperTest> obj = TodoMapperTest.class;
int passed = 0;
int failed = 0;
int count = 0;
for (Method method : obj.getDeclaredMethods()) {
if (method.isAnnotationPresent(Before.class))
method.invoke(obj.newInstance());
if (method.isAnnotationPresent(DEV.class)) {
try {
method.invoke(obj.newInstance());
System.out.printf("%s - Test '%s' - passed %n", ++count, method.getName());
passed++;
} catch (Throwable ex) {
System.out.printf("%s - Test '%s' - failed: %s %n", ++count, method.getName(), ex);
failed++;
}
}
if (method.isAnnotationPresent(After.class))
method.invoke(obj.newInstance());
}
System.out.printf("%nResult : Total : %d, Passed: %d, Failed %d%n", count, passed, failed);
}
@Before
阶段:
TodoQueryMapper mapper;
SqlSession session;
@Before
public void setUp() throws Exception {
InputStream inputStream = Resources.getResourceAsStream("todo-mybatis/mybatis-test.xml");
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
inputStream.close();
session = sqlSessionFactory.openSession();
mapper = session.getMapper(TodoQueryMapper.class);
}
编辑:测试用例:
@Test
@DEV
public void test_case() throws Exception {
SqlParams params = new SqlParams();
params.idList = Collections.singletonList(1234567);
// In here, 'mapper' variable is null, even @Before invoked
List<TodoDto> data = mapper.findByIdList(params);
assertEquals(1, data.size());
}
开发注释:
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface DEV {
}
每次通过反射调用方法时,都会创建测试类的新实例:method.invoke(obj.newInstance());
应将测试执行分为三个阶段:之前、测试和之后。遍历测试方法,找到 Before- 和 After-方法并按所需顺序执行它们。
伪代码:
Class<AccountDaoMapperTest> objClass = AccountDaoMapperTest.class;
for (Method testMethod : findTestMethods(objClass)) {
AccountDaoMapperTest objUnderTest = objClass.newInstance();
findBeforeMethod(objClass).invoke(objUnderTest);
testMethod.invoke(objUnderTest);
findAfterMethod(objClass).invoke(objUnderTest);
}