Question

我正在编写一个JUnit测试用例。我想初始化一个列表对象。为简便起见，让我们初始化String对象的列表：

public class MyTest {
    @Rule
    public List<MySQLContainer> tests = Arrays.asList(new MySQLContainer("5.5"), new MySQLContainer("5.6"));

    @Test
    public void myTest() {

    }
}

执行时，出现以下运行时错误：

org.junit.internal.runners.rules.ValidationError: The @Rule 'tests' must implement MethodRule or TestRule.
at org.junit.internal.runners.rules.RuleMemberValidator$FieldMustBeARule.validate(RuleMemberValidator.java:234)
at org.junit.internal.runners.rules.RuleMemberValidator.validateMember(RuleMemberValidator.java:99)
at org.junit.internal.runners.rules.RuleMemberValidator.validate(RuleMemberValidator.java:93)
at org.junit.runners.BlockJUnit4ClassRunner.validateFields(BlockJUnit4ClassRunner.java:196)
at org.junit.runners.BlockJUnit4ClassRunner.collectInitializationErrors(BlockJUnit4ClassRunner.java:1

仅初始化MySQLContainer而不是List<MySQLContainer>时，不会出现此类错误。

为什么这不起作用？我该如何解决？

我的依赖项中包含JUnit 4.12。

Answer 1

尝试使用ArrayList（）

    public List<MySQLContainer> tests = new ArrayList();

Answer 2

@Rule用于在每种测试方法之前执行代码。如果您只需要初始化成员，请将此初始化放入带有@Before注释的方法中：

public class MyTest {    
    private List<MySQLContainer> containers;

    @Before
    public void initContainers() {
        containers =  = Arrays.asList(new MySQLContainer("5.5"), new MySQLContainer("5.6"));
    }

    @Test
    public void myTest() {
        // Some test...    
    }
}

Answer 3

删除employeeID || category || endDate 1 || Drivers License || 2019-01-01 1 || Medical Examiners Certificate || 2019-01-01 2 || Drivers License || 2016-01-01 2 || Medical Examiners Certificate || 2020-01-01，一切正常。

@Rule

public class MyTest { private final List<MySQLContainer> tests = Arrays.asList( new MySQLContainer("5.5"), new MySQLContainer("5.6") ); @Test public void myTest() { } }用于JUnit 4扩展，可以做一些更复杂的事情。

通过@Rule在JUnit中初始化List <！-？->

3 个答案: