mock cdi bean

[V. Sevel]

hello,

I have been trying to write some tests where one of the cdi bean gets mocked.

I have used weld-junit5, which seems to work to some level.

here is my test:

@QuarkusTest
@EnableAutoWeld
public class MyTest {

    @Inject
    GreetingService service;

    @Produces
    @OverrideBean
    CoucouService fakeCoucou = new CoucouMock();

    @Test
    public void mytest() {
        Assertions.assertEquals("hello mock", service.greeting());
    }
}

with src/main/java:

@ApplicationScoped
public class GreetingService {

    @Inject
    CoucouService coucou;

    public String greeting(String name) {
        return "hello " + name;
    }

    public String greeting() {
        return "hello " + coucou.getName();
    }
}

@ApplicationScoped
public class CounterService {

    AtomicInteger counter = new AtomicInteger();

    public int next() {
        return counter.incrementAndGet();
    }
}

and

@ApplicationScoped
public class CoucouService {

    @Inject
    CounterService counterService;

    public String getName() {
        return "coucou" + counterService.next();
    }
}

in src/test/java I have added for the test:

@ApplicationScoped
public class CoucouMock extends CoucouService {

    @Override
    public String getName() {
        return super.getName() + "mock";
    }
}

if I run test test, I get:


java.lang.NullPointerException
	at org.acme.quickstart.CoucouService.getName(CoucouService.java:19)
	at org.acme.quickstart.CoucouMock.getName(CoucouMock.java:17)
	at org.acme.quickstart.GreetingService.greeting(GreetingService.java:23)
	at org.acme.quickstart.GreetingService$Proxy$_$$_WeldClientProxy.greeting(Unknown Source)
	at org.acme.quickstart.MyTest.mytest(MyTest.java:31)

this means that the @OverrideBean worked as expected, but the inherited CoucouService.counterService is null because obviously I am instantiating directly CoucouService fakeCoucou = new CoucouMock(), and counterService from the superclass does not get instantiated.;

my goal here was simply to be able to reimplement some of the methods from the original CoucouService in a subclass (ie: CoucouMock) that would be used everywhere we needed the original CoucouService, but still benefiting from the default behavior of CoucouService (which gets injected the CounterService)

what is the proper way of adressing this kind of use case? mockito?

thanks,
vincent

[Martin Kouba]

Hello Vincent,

You can't use weld-junit together with @QuarkusTest. In fact, these are
two different tools, each has a different goal. weld-junit is a tool for
CDI component testing whereas @QuarkusTest can be used to test your
application as a whole.

A basic mock support in @QuarkusTest will be added to the next release
(0.12.0):
https://github.com/quarkusio/quarkus/blob/master/docs/src/main/asciidoc/getting-started-testing.adoc#user-content-mock-support

Also note that Quarkus DI is based on CDI but it's not a full
implementation - not every feature that can be tested with weld-junit
will work in Quarkus.

Martin

Dne 12. 03. 19 v 21:50 V. Sevel napsal(a):

> hello,
> I have been trying to write some tests where one of the cdi bean gets
> mocked.
> I have used weld-junit5, which seems to work to some level.
>
> here is my test:
>
> @QuarkusTest
> @EnableAutoWeld
> public class MyTest {
>
> @Inject
> GreetingServiceservice;
>
> @Produces
> @OverrideBean

> CoucouServicefakeCoucou =new CoucouMock();

>
> @Test
> public void mytest() {
> Assertions.assertEquals("hello mock",service.greeting());
> }
> }
>
>
> with src/main/java:
>
>
> @ApplicationScoped
> public class GreetingService {
>
> @Inject
> CoucouServicecoucou;
>
> public String greeting(String name) {
> return "hello " + name;
> }
>
> public String greeting() {
> return "hello " +coucou.getName();
> }
> }
>
>
> @ApplicationScoped
> public class CounterService {
>

> AtomicIntegercounter =new AtomicInteger();

>
> public int next() {
> return counter.incrementAndGet();
> }
> }
>
>
> and
>
>
> @ApplicationScoped
> public class CoucouService {
>
> @Inject
> CounterServicecounterService;
>
> public String getName() {
> return "coucou" +counterService.next();
> }
> }
>
>
> in src/test/java I have added for the test:
>
>
> @ApplicationScoped

> public class CoucouMockextends CoucouService {

>
> @Override
> public String getName() {
> return super.getName() + "mock";
> }
> }
>
>
> if I run test test, I get:
>
>
>
> java.lang.NullPointerException
> at org.acme.quickstart.CoucouService.getName(CoucouService.java:19)
> at org.acme.quickstart.CoucouMock.getName(CoucouMock.java:17)
> at org.acme.quickstart.GreetingService.greeting(GreetingService.java:23)
> at org.acme.quickstart.GreetingService$Proxy$_$$_WeldClientProxy.greeting(Unknown Source)
> at org.acme.quickstart.MyTest.mytest(MyTest.java:31)
>
>

> this means that the @OverrideBean worked as expected, but the inherited CoucouService.counterService is null because obviously I am instantiating directly CoucouServicefakeCoucou = new CoucouMock(), and counterService from the superclass

> does not get instantiated.;
>
>
> my goal here was simply to be able to reimplement some of the methods

> from the original CoucouService in a subclass (ie: CoucouMock) that would be used everywherewe needed the original CoucouService, but still benefiting from the

> default behavior of CoucouService (which gets injected the CounterService)
>
>
> what is the proper way of adressing this kind of use case? mockito?
>
>
> thanks,
>
> vincent
>
>
>
>

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[V. Sevel]

will there be an opportunity to change the alternative for a given service from test to test?

from the doc it does not seem so. 

> <mailto:quarkus-dev+unsub...@googlegroups.com>.

[Stuart Douglas]

This is planned, but has not been implemented yet.

Stuart

[Jeremy Davis]

Has this made it into a release?

[Georgios Andrianakis]

Nope, it hasn't.

> <mailto:quarkus-dev...@googlegroups.com>.

> Visit this group at https://groups.google.com/group/quarkus-dev.
> For more options, visit https://groups.google.com/d/optout.

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[John Clingan]

FYI, the recommended approach is to use a CDI @Alternative

[V. Sevel]

it sounds like the new QuarkusMock is doing everything we need

see https://github.com/quarkusio/quarkus/pull/8175