How to expect exception in constructor with catch-exception?

Question

Is it possible to expect exception in constructor with catch-exception? Can't figure out the syntax. For methods I am writing

catchException(instance).method();

and then, for example

assert caughtException() instanceof IndexOutOfBoundsException;

What should I write for

new MyClass();

?

It is mentionned in the tags and text. I have added the link since people seems don't know — Suzan Cioc, Jul 23 '14 at 20:26
`catch-exteption` is the library from Google, I have added the link — Suzan Cioc, Jul 23 '14 at 20:29
It's impossible using this library. It bases on creating a proxy around your instance object - thus an instance must exist. — Piotr Gwiazda, Jul 23 '14 at 20:31
@PiotrGwiazda if you sure it is impossible, post this as an answer I will select it if no other info — Suzan Cioc, Jul 23 '14 at 20:33

Kao · Answer 1 · 2014-07-23T20:33:03.190

Using catch-exception library, recommended way is to use the builder pattern:

import com.google.common.base.Supplier; // Google Guava

Supplier<MyClass> builder = new Supplier<MyClass>() {
   @Override
    public MyClass get() {
       return new MyClass();
   }
};
verifyException(builder).get();

If you are using JUnit 4 for unit testing, you can use Expected Exceptions:

public class TestClass {  

    @Test(expected = MyException.class)  
    public void createObjectTest() {  
        MyClass object = new MyClass();  
    }  
}

In older version of JUnit youd simply catch your exception:

public class TestClass {  

    @Test  
    public void createObjectTest() {  
        try {  
            MyClass obj = new MyClass();  

            fail("An exception should be thrown!");  

        } catch (MyException e) { 
        }  
    }  
}

This is correct, thanks. I will choose this answer if no answers will come about `catch-exception` — Suzan Cioc, Jul 23 '14 at 20:27
@SuzanCioc I edited an answer by adding `catch-exception` example — Kao, Jul 23 '14 at 20:39

How to expect exception in constructor with catch-exception?

1 Answers1