CODEWITHSUNDEEP
javajunitmockito
Doctor Who
Doctor Who

Reputation: 792

Write Junit to cover catch block

I have researched a lot, but not able to find proper solution,

I have a method in service class which is calling a consumer like below

    try {
        snsProducer.send(message);
    } catch (JsonProcessingException jpe) {
        throw new SnSException(
                "Could not parse Message to publish to SNS");
    }

I am trying to cover catch block through test cases but still not successful.

Here is what I have tried

@Test
void snsTest() {
   
    when(service.doCreate(message)).thenThrow(new JsonProcessingException("Json Processing Error"){});
    assertThrows(SnSException.class,()-> service.doCreate(message));
}

but this throws Checked exception is invalid for this method!

I tried this too

when(service.doCreate(message)).thenThrow(new JsonProcessingException("Exception"){});
        assertThrows(SnStateException.class,()-> service.doCreate(message));

but this throws this error Expected SnSException to be thrown, but nothing was thrown.

Complete Test case

@Test
void doCreateTest(){
String id = RandomStringUtils.randomAlphanumeric(20);
Subscription subscription = testUtils.createEntity(sId,RandomStringUtils.randomAlphanumeric(20));
Manifest manifest = new Manifest();
manifest.setCommon(new Common());
doReturn(manifest).when(manifestUtils).getManifestWithLatestVersion(any());
when(service.doCreate(subscription)).thenThrow(new JsonProcessingException("Exception"){});
assertThrows(SnSException.class,()-> service.doCreate(subscription));
}

I am not sure what I am doing wrong, Any help would be appriciated

Upvotes: 0

Views: 147

Answers (1)

aatwork
aatwork

Reputation: 2270

From your code, I can see that snsProducer.send(message) is throwing checked exception JsonProcessingException. So when().thenThrow() should be written around it.

   @Test
    void snsTest() {
       
        when(snsProducer.send(message)).thenThrow(new JsonProcessingException("Json Processing Error"){});
        assertThrows(SnSException.class,()-> service.doCreate(message));
    }

Upvotes: 1

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