Hello Jordi,
The injector is created for every test in your test class, like it's
done with @Before, to have a clean slate for every test. Of course it
would be faster if it was done per test class. But then each test has
to be aware of that it's sharing state with the other tests, and a
failing test might be failing because of something a previous test
case did.
regards,
Guðmundur Bjarni