How to test constructor of a class that has a @PostConstruct method using Spring?

Question

If I have a class with a @PostConstruct method, how can I test its constructor and thus its @PostConstruct method using JUnit and Spring? I can't simply use new ClassName(param, param) because then it's not using Spring -- the @PostConstruct method is not getting fired.

Am I missing something obvious here?

public class Connection {     private String x1;     private String x2;      public Connection(String x1, String x2) {         this.x1 = x1;         this.x2 = x2;     }      @PostConstruct     public void init() {         x1 = "arf arf arf";     }  }   @Test public void test() {     Connection c = new Connection("dog", "ruff");     assertEquals("arf arf arf", c.getX1()); } 

I have something similar (though slightly more complex) than this and the @PostConstruct method does not get hit.

Answer 1

If the only container managed part of Connection is your @PostContruct method, just call it manually in a test method:

@Test public void test() {   Connection c = new Connection("dog", "ruff");   c.init();   assertEquals("arf arf arf", c.getX1()); } 

If there is more than that, like dependencies and so on you can still either inject them manually or - as Sridhar stated - use spring test framework.