在Java的静态方法中使用自己的类

Question

I have several junit test cases that extend an AbstractTest. They're all required to have a static method suite() . However people usually copy&paste old test case to make new one, and they end up forgetting to change the old OtherTest.class to the new one TestA.class . This is bad because the new test will not run, and this is very hard to detect, because there is no compile error.

public class TestA{
    public static junit.framework.Test suite() {
    return new junit.framework.JUnit4TestAdapter(
        OtherTest.class);// Should be TestA.class
    }
}

Is there a way to write something like

return new junit.framework.JUnit4TestAdapter(this);

If the above is not possible, are there any other ways to at least mark this type of error?

Answer 1

A variation on what @Killian Foth suggested is:

public static junit.framework.Test suite() {
    class Inner {} // to get a handle on this class
    return new junit.framework.JUnit4TestAdapter(
        Inner.class.getEnclosingClass());
}

Answer 2

A further variation:

    Class thisClass = new SecurityManager() {

        public Class getCurrentClass() {
            return getClassContext()[1];
        }

    }.getCurrentClass();

The advantage of this is that you can separate the SecurityManager from the class you're using it in, ie, you can have only one instance of it somewhere and use it to obtain interesting reflective metadata, including this one. Without any special ugliness about it. The reason a plain SecurityManager doesn't work here is that getClassContext is protected .

edit: further example

public class ClassUtil extends SecurityManager {

    public static Class getCurrentClass() {
        return getClassContext()[1];
    }
}

public class TestA {
    private static thisClass = ClassUtil.getCurrentClass();

    public static junit.framework.Test suite() {
        return new junit.framework.JUnit4TestAdapter(thisClass);
    }
}

public class TestB {
    private static thisClass = ClassUtil.getCurrentClass();

    public static junit.framework.Test suite() {
        return new junit.framework.JUnit4TestAdapter(thisClass);
    }
}

Answer 3

If you're not afraid of really, really ugly code, try:

Class thisClass = new Object() { }.getClass().getEnclosingClass();
return new junit.framework.JUnit4TestAdapter(thisClass);

Answer 4

另一个想法是查看堆栈跟踪，即，如果已复制静态方法，则Thread.currentThread（）。getStackTrace（）[2] .getClassName（）应该为您提供类的名称。