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Howto test a service with JUnit [message #1112976]

Fri, 20 September 2013 09:09

Eclipse User

Hey all,

i have two plugins, plugin A containing the interface MyService.java and plugin B containing MyServiceImpl.java. Now i want to write a JUnit test which tests a method of MyService (The testclass is within a fragment). How can i get an instance of MyService? Because i do not exporte the package of MyServiceImpl i cannot call "new MyServiceImpl()". I tried to use DI (@Inject) but it doesn´t work... How can i get my service to test it?

Thanks all.
Thomas

[Updated on: Fri, 20 September 2013 09:15] by Moderator

Re: Howto test a service with JUnit [message #1112989 is a reply to message #1112976]

Fri, 20 September 2013 09:33

Eclipse User

You can create a Factory class in plugin B which contains a static method returning a MyService by creating a MyServiceImp within the factory. You can then expose the factory class. If this factory retains a static reference you can also add proxy methods to the factory to test non public api within MyServiceImpl if needed. If you call the class something like JUnitMyServiceFactory it should be pretty obvious what it is used for.

Re: Howto test a service with JUnit [message #1112994 is a reply to message #1112989]

Fri, 20 September 2013 09:42

Eclipse User

Hey Phill,

thanks for you reply, but doesnt this approach break the rule "Never mix Test and Working code" ? If i get you, i have to create a factory in my application code only for test purposes.
I think there must be a simple way to retrieve my registered service in my test class without having extra code.

Anyway thanks alot for your idea.

Thomas

Re: Howto test a service with JUnit [message #1113050 is a reply to message #1112994]

Fri, 20 September 2013 11:13

Eclipse User

You don't have to mix the code. In the project properties source tab you can add say a test folder. If you create the same package name in the test folder then the class test folder will have access to "default" methods in the src folder. I think it is referred to as parallel source trees.

Re: Howto test a service with JUnit [message #1113138 is a reply to message #1112976]

Fri, 20 September 2013 13:47

Eclipse User

Thomas Wilhelm wrote on Fri, 20 September 2013 15:09

Hey all,

i have two plugins, plugin A containing the interface MyService.java and plugin B containing MyServiceImpl.java. Now i want to write a JUnit test which tests a method of MyService (The testclass is within a fragment). How can i get an instance of MyService? Because i do not exporte the package of MyServiceImpl i cannot call "new MyServiceImpl()". I tried to use DI (@Inject) but it doesn´t work... How can i get my service to test it?

Thanks all.
Thomas

You can start a JUnit Plug-in Test and use the OSGi service registry to obtain an/the instance of your service.

Re: Howto test a service with JUnit [message #1114720 is a reply to message #1113138]

Mon, 23 September 2013 01:40

Eclipse User

Ok here is my Code which returns null for the serviceReference and so throws an exception when calling bundleContext.getService(null). Can anybode post a piece of code which should work?

@Test
    public void testMyService() throws Exception
    {
        BundleContext bundleContext = FrameworkUtil.getBundle(this.getClass())
                .getBundleContext();

        ServiceReference<?> serviceReference = bundleContext
                .getServiceReference(MyService.class);

        MyService service = (MyService) bundleContext
                .getService(serviceReference);
    }

Thanks a lot
Thomas

Re: Howto test a service with JUnit [message #1114762 is a reply to message #1112976]

Mon, 23 September 2013 03:02

Eclipse User

Ok i´ve got it, i´ve made a newbie mistake... fragments can access classes contained in non exported packages of their host plugin. I just had the wrong host plugin because of some experiments before Sad

Shame on me Wink

Thanks anyway
Thomas

Re: Howto test a service with JUnit [message #1115511 is a reply to message #1114720]

Tue, 24 September 2013 03:45

Eclipse User

Event if you managed to solve your problem: To use a service you have to make it available, first. I.e., you are missing the part that registers the service.
You can use DS (OSGi declarative services) or you can register the service in the startup of your bundle activator (of Plugin B as B provides the MyServiceImpl).

Thomas Wilhelm wrote on Mon, 23 September 2013 07:40

Ok here is my Code which returns null for the serviceReference and so throws an exception when calling bundleContext.getService(null). Can anybode post a piece of code which should work?
@Test
    public void testMyService() throws Exception
    {
        BundleContext bundleContext = FrameworkUtil.getBundle(this.getClass())
                .getBundleContext();

        ServiceReference<?> serviceReference = bundleContext
                .getServiceReference(MyService.class);

        MyService service = (MyService) bundleContext
                .getService(serviceReference);
    }
Thanks a lot
Thomas

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