CODEWITHSUNDEEP
testingmethodsjunitvoid
enjazweb
enjazweb

Reputation: 493

How to apply jUnit test on a void method

i have this class

@Value("${norsys.loadfile.directory}")
private String chemin;

@RequestMapping(value = "/{fileName:.+}", method = RequestMethod.GET)
@ResponseBody()
public void loadVideoFile(@PathVariable("fileName") String fileName,HttpServletResponse response) {
    try {
        response.setContentType("video/mp4");
        Files.copy(Paths.get(chemin, fileName), response.getOutputStream());
        response.flushBuffer();
    } catch (java.io.FileNotFoundException e) {
        response.setStatus(HttpStatus.NOT_FOUND.value());
    } catch (Exception e) {
        response.setStatus(HttpStatus.INTERNAL_SERVER_ERROR.value());
    }
}

I dont know how to apply a JUnit test to keep coverage high, I hope that you can give me an idea, thank you

Upvotes: 1

Views: 294

Answers (1)

Andrew R. Freed
Andrew R. Freed

Reputation: 357

In general you can use Mockito http://docs.mockito.googlecode.com/hg/org/mockito/Mockito.html to test classes which have heavyweight dependencies. Using a mock HttpServletResponse class you could verify that the status code is set appropriately for your failure/success cases.

You're going to run into some problems with the use of those static methods.

Instead of 

Files.copy(Paths.get(chemin, fileName), response.getOutputStream());

You could use a non-static class, which you could then mock

class ResourceCopier {
   public void copy(String dir, String file, OutputStream os) {
     Files.copy(Paths.get(dir, file), os);
   }
}

Your main class uses

private ResourceCopier resourceCopier;

public void loadVideoFile(....) {
   resourceCopier.copy(chemin, fileName, response.getOutputStream());
}

And in your test class you create your primary object, create a Mock of ResourceCopier and HttpServletResponse and use @InjectMocks to inject them to your primary object. You can then use Mockito's verify() method to make sure the right things have happened (like response.setStatus called with 404 code)

Upvotes: 1

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