How to Unit Test an interface that is always Autowired (Java)

Question

So I have an interface, let's call it X

So in the regular code i have:

public class doStuff()
{
@Autowired
private X x;

public stuff()
{
x.doYourThing();
}
}

I have no idea how to test this though.

If i try:

public class XTest()
{
  @Autowired
  private X x;
  public void test(){
  string val = x.FillUpVal();
  assertTrue("It didn't work",val=="hi");
  }

}

I get x as null so it immediately throws a NullPointerException and fails the test. I'm looking for some guidance as to the proper way to go about this.

Needs more clarification on what you want to test: 1) how `doStuff()` behaves when `X` behaves in certain ways (use a mock) or 2) how `doStuff()` behaves when wired up with the real X that would be used at runtime (use Spring's Test Context library) — matt b, Sep 13 '12 at 20:20

score 2 · Answer 1 · edited May 23 '17 at 11:49

You can in fact @Autowire a mock object. I recommend Mockito framework. More info and examples: http://code.google.com/p/mockito/

Injecting Mockito mocks into a Spring bean

How to Unit Test an interface that is always Autowired (Java)

1 Answers1