JUnit @BeforeClass non-static work around for Spri

问题:

JUnit's @BeforeClass annotation must be declared static if you want it to run once before all the @Test methods. However, this cannot be used with dependency injection.

I want to clean up a database that I @Autowire with Spring Boot, once before I run my JUnit tests. I cannot @Autowire static fields so I need to think of a work around. Any ideas?

回答1:

Just use @Before (instead of @BeforeClass) (or BeforeTransaction (depending on how you initialize the database)). This annotation must been attached to an nonstatic public method.

Of course: @Before run before EACH test case method (not like @BeforeClass that runs only once.) But if you want to run it exactly once, then use an static marker field.

private static boolean initialized = false;
...
@Before
public void initializeDB() { 
   if (!initialized) {
       ... //your db initialization
       initialized = true;
   }
}
---

回答2:

Try this solution: https://stackoverflow.com/a/46274919/907576 :

with @BeforeAllMethods/@AfterAllMethods annotations you could execute any method in Test class in an instance context, where all injected values are available.

回答3:

Have a look at the DBUnit library - it's designed to perform the actions you're describing. It can create & tear down database instances and provides you with simple ways to do this.

回答4:

Though accepted answer is clever, seems hacky. Have you tried using a normal Constructor?

public class MyJUnitTest {

    public MyJUnitTest() {
       // code for initializeDB
    }

    // Tests

}