@InjectMocks on a class that has primitives as fields

Question

Here's my class I'm trying to mock.

private MemcachedClient memcachedClient;

private CachedObjectFactory cachedObjectFactory;

private int cacheTimeToLive;

private boolean hasCert;

@Autowired
public MyClass(CachedObjectFactory cachedObjectFactory,
                         MemcachedClient memcachedClient,
                         @Value("${cache.ttl.in.second}") int cacheTimeToLive,
                         @Value("${hasCert}") boolean hasCert) {
    this.cachedObjectFactory = cachedObjectFactory;
    this.memcachedClient = memcachedClient;
    this.cacheTimeToLive = cacheTimeToLive;
    this.hasCert = hasCert;
}

When I use @InjectMocks, it complains that it can't figure out how to initialize it with a default constructor (because there isn't one). I think mockito could use create this, but I don't know how to inject a primitive (the boolean/cacheTimeToLive). Is there a way to do this in my test?

Answer 1

See Mockito documentation:

1. Constructor injection; the biggest constructor is chosen, then arguments are resolved with mocks declared in the test only. If the object is successfully created with the constructor, then Mockito won't try the other strategies. Mockito has decided to no corrupt an object if it has a parametered constructor.
   Note: If arguments can not be found, then null is passed. If non-mockable types are wanted, then constructor injection won't happen. In these cases, you will have to satisfy dependencies yourself.

[...]

And finally, no injection will happen on the type in this case:

public class ArticleManager {
    private ArticleDatabase database;
    private ArticleCalculator calculator;

    ArticleManager(ArticleObserver observer, boolean flag) {
        // observer is not declared in the test above.
        // flag is not mockable anyway
    }
}

You will have to satisfy dependencies yourself, for example with a setup method using JUnit's @Before.