CODEWITHSUNDEEP
javaspring-cloud-feign
agascon
agascon

Reputation: 785

Feign Unit Testing Not found response

I'm trying to implement a unit test involving a FeignClient call which should return a 404 Not Found.

As Feign is trowing a FeignException for 404, what is the proper way to implement this test case?

I'm trying something like this...

when(mockedApiClient.userDataDelete(anyString()))
                .thenThrow( ... );

What should I throw?

Upvotes: 6

Views: 31282

Answers (7)

Alexander
Alexander

Reputation: 171

In kotlin you can use anonymous object like this

every { service.method() } throws object : FeignException(400, "message") {}

In java it should be something like this:

when(service.method()).thenThrow(new FeignException(400, "message") {} );

Upvotes: 0

Flavio Oliva
Flavio Oliva

Reputation: 619

Mock your FeignException:


var ex = Mockito.mock(FeignException.class);
Mockito.when(ex.status()).thenReturn(404);
Mockito.when(mockedApiClient.userDataDelete(anyString()))
       .thenThrow(ex);

Upvotes: 11

ruslanKhodzhaev
ruslanKhodzhaev

Reputation: 29

 Request request = mock(Request.class);

 when(someClient.someGetRequest(List.of(doc.getId())))
            .thenThrow(new FeignException.NotFound("message", request, null, null));

You can avoid create Request, only mocking it.

Upvotes: -1

Deekshith Anand
Deekshith Anand

Reputation: 2662

Feign Already provides inner classes like NotFound and other typica HTTP response code types. An example is shown here.

Request request = Request.create(Request.HttpMethod.GET, "url",
                    new HashMap<>(), null, new RequestTemplate());
            throw new FeignException.NotFound("", request, null);

Just modify the above as per your needs! Key point to note is that Request object is mandatory. As of 2021 few overloads like Request.create are deprecated. Look out for what you use!

Hope that helps! happy Coding!

Upvotes: 15

Michael froids
Michael froids

Reputation: 61

Well, to me worked as below (i used EasyRandom as generator of some fields):

private EasyRandom easyRandom = new EasyRandom();
 Map<String, Collection<String>> headersError = easyRandom.nextObject(HashMap.class);
 byte[] bodyError = easyRandom.nextObject(byte[].class);

 when(mockedApiClient.userDataDelete(anyString())
                .thenThrow(FeignException.errorStatus(
                        "userDataDelete",
                        Response.builder()
                                .status(404)
                                .reason("message error")
                                .request(Request.create(
                                        Request.HttpMethod.POST,
                                        "foo/foo/bar/v1/delete-data-user",
                                        headersError, //this field is required for construtor//
                                        null,
                                        null,
                                        null))
                                .body(bodyError)//this field is required for construtor
                                .build())
                );

Upvotes: 5

richie priya
richie priya

Reputation: 21

To return 404 Feign Exception on mocking the service, you can try out these things :

  1. create your own exception class which will extends Feign Exception.
  2. Annotate Response Status with value of HttpStatus.NOT_FOUND.
  3. Override the constructor as given below :
import feign.FeignException;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.ResponseStatus;

@ResponseStatus(value = HttpStatus.NOT_FOUND)
public class SampleFeignClientException extends FeignException {

    public SampleFeignClientException (String message, Throwable cause) {
        super(message, cause);
    }

    public SampleFeignClientException (String message, Throwable cause, byte[] content) {
        super(message, cause, content);
    }

    public SampleFeignClientException (String message) {
        super(message);
    }

    public SampleFeignClientException (int status, String message, byte[] content) {
        super(status, message, content);
    }
}
  1. In Junit Test case dothrow the created sampleFeignException class.
    @Test
    public void sampleTestMethod() {
        SampleFeignClientException sampleFeignClientException = new sampleFeignClientException(404, "NOT FOUND", new byte[1]);

         doThrow(sampleFeignClientException).when(mockService).method();

 }

I hope this may helps you to resolve the problem.

Upvotes: 2

agascon
agascon

Reputation: 785

Unless any other better solution is provided, this is how I have overcome this...

when(mockedApiClient.userDataDelete(anyString()))
                .thenThrow(FeignException.errorStatus(
                        "userDataDelete",
                        Response.builder()
                                .status(404)
                                .headers(new HashMap<>())
                                .reason("Not found").build()));

Upvotes: 2

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