Groovy HTTPBuilder Mocking the Client

This question is closely related to this question. The difference is that I'd like to follow the recommended approach of mocking the client. So, I have the following HTTPBuilder defined:

protected readUrl() {
    def http = new HTTPBuilder("")
    def status = http.request(Method.GET, ContentType.JSON) {req ->
        response.success = {resp, json ->
            result = json.toString()
            new Success<String>(result)
        response.'401' = {resp ->
            final String errMsg = "Not Authorized"
            new Failed(Failable.Fail.ACCESS_DENIED, errMsg)
        response.failure = {resp ->
            final String errMsg = "General failure ${resp.statusLine}"
            new Failed(Failable.Fail.UNKNOWN, errMsg)

What I'd like to do is find a way to unit test this code block. I wanted to mock the response so I could specifically set the response codes, if possible. Could someone please show me a way to do this?


This is my prefered solution:

class MockHTTPBuilder{
    def pleaseFail = false
    def mockData = []
    def request(a, b, c){
        if(pleaseFail) [status:'500',data: mockData ?: "It failed :("]
        else [status:'200',data: mockData ?: "Yay :)"]

Here's some sample usages:

Alternatively, you can metaprogram the actual httpClient instance and make it behave as expected(forcebly failing or passing during test-time) but that's a little bit more complicated.

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