@parameters方法在@beforeclass方法之前执行 [英] @parameters method is executed before @beforeclass method

问题描述

我正在使用junit 4的参数化"功能，并且我注意到@parameters方法在@beforeclass方法之前执行.这给我造成了一个问题，因为我通过@parameters传递给测试用例的参数取决于@beforeclass方法中初始化的代码.例如

I'm using "parametrized" feature of junit 4 and I noticed that @parameters method is executed before @beforeclass method. This is creating a problem for me because the parameters i'm passing to the test cases via @parameters depends on the code initialize in the @beforeclass method. For example

@RunWith(Parameterized.class)
public class TestOtherClass {

    String argument;
    private static boolean initializeThis;

    public TestOtherClass(String parameter) throws Exception {
        argument=parameter;
    }

    @BeforeClass
    public static void doSetup() {
        System.out.println("Doing setup before class...");
        initializeThis=true; // true or false, based on some condition
    }

    @Test
    public void otherTest() {
        System.out.println("Other test: " + argument);
    }

    @Parameters
    public static Collection<Object[]> getData(){
        System.out.println("Inside parameter");
        String addThis;
        if(initializeThis)
            addThis="adding true";
        else
            addThis="adding false";

        Object[] para1 = new Object[]{"First parameter :: " + addThis};
        Object[] para2 = new Object[]{"Second parameter :: " + addThis};

        Collection<Object[]> classNames = new ArrayList<Object[]>();
        classNames.add(para1);
        classNames.add(para2);
        return classNames;
    }
}

现在，我正在@beforeclass方法中将变量"initializeThis"初始化为true，但是(令人惊讶地)当我执行打印的测试用例时

Now, I'm initializing variable "initializeThis" to true in @beforeclass method but (surprisingly) when I executed the test case it prints

Other test: First parameter :: adding false
Other test: Second parameter :: adding false

那是意料之外的事情.
我的问题是；有什么方法可以在@parameters之前执行@beforeclass方法，我们可以在junit 4中执行此操作吗?

That is something not expected.
My question is; is there any way to execute the @beforeclass method before @parameters, can we do this is in junit 4?

推荐答案

我将只使用普通的旧Java静态{..}初始化程序，而不使用@BeforeClass，例如:

I would use just plain old java static {..} initializer instead of @BeforeClass, e.g.:

@RunWith(Parameterized.class)
public class TestOtherClass {

    String argument;
    private static boolean initializeThis;

    public TestOtherClass(String parameter) throws Exception {
        argument=parameter;
    }

    static {
        doSetup();
    }

    // @BeforeClass
    public static void doSetup() {
        System.out.println("Doing setup before class...");
        initializeThis=true; // true or false, based on some condition
    }

    @Test
    public void otherTest() {
        System.out.println("Other test: " + argument);
    }

    @Parameters
    public static Collection<Object[]> getData(){
        System.out.println("Inside parameter");
        String addThis;
        if(initializeThis)
            addThis="adding true";
        else
            addThis="adding false";

        Object[] para1 = new Object[]{"First parameter :: " + addThis};
        Object[] para2 = new Object[]{"Second parameter :: " + addThis};

        Collection<Object[]> classNames = new ArrayList<Object[]>();
        classNames.add(para1);
        classNames.add(para2);
        return classNames;
    }
}

我知道的唯一缺点是，继承自该类的类将无法覆盖静态初始值设定项，而@BeforeClass在此方面具有一定的自由度；

Only drawback I know is that classes inherited from this won't be able to override static initializer, while @BeforeClass gives some freedom in this aspect;

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