Spring Junit test case for controller rest service

Question

I have a controller which responds to REST calls, I have various test cases for my other public methods.

I do not know how to write one for my controller:

@RequestMapping(value = "/api/frames", method = RequestMethod.GET)
public List<Frame> getFrames(
  @RequestParam(value="frameLength", required=true) Double frameLength,
  @RequestParam(value="frameBreadth", required=true) Double frameBreadth,
  @RequestParam(value="mountThickness", required=true) Double mountThickness,
  @RequestParam(value="frameThickness", required=true) Double frameThickness){
    List<Frame> tempFrames = new ArrayList<>();
    List<FrameVariant> frameVariants = frameVariantService.getFrames(
      frameLength, frameBreadth, mountThickness, frameThickness);
    for (FrameVariant frameVariant : frameVariants) {
      tempFrames.add(new Frame(frameVariant));
    }
    return tempFrames;
  }

I have no clue how to write a test case for this controller method.

Answer 1

This article provides a good introduction to testing REST controllers with MockMvc. Sample code for this post is available on Github.

Answer 2

Take a look at MockMvc. It's part of Spring Test module.

These tutorials are pretty descriptive and going into details so you should get idea straight away how to test Spring MVC controllers.