Can I make code run before the constructor using annotations

Question

I am using Guice to create and inject instances in my application.

For testing purposes I created a class that is responsible for creating all the static instances needed for a specific test class and inject them. Let's call this class GuiceGraphBuilder.

I want to create and initiate the GuiceGraphBuilder before my mock / test class constructor is called, as some of my mock classes requires the injection to happen on construction time.

Currently I am using a static constructor that initiate GuiceGraphBuilder and populate bunch of static fields.

Is there a way to use some kind of annotation to make a code run before the constructor does? I have seen an answer that uses Guice, but this of course is not good in my case, since I want to create the Guice injector in the generated code.

Answer 1

I suppose you test using junit? Then you have the lifecycle hooks

• @BeforeClass - run once before first test (use for static setup)
• @Before - run before every test method
• @After - run after each test method
• @AfterClass - run once after all tests finished

I suppose that, arbitrary from guice, you will be able to solve your problem by matching init and clean up to the correct phase.