Groovy HTTPBuilder Mocking the Client - unit-testing

Question

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("http://example.com")
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?

Answer 1

This is my prefered solution:
class MockHTTPBuilder{
MockHTTPBuilder(string){}
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: http://groovyconsole.appspot.com/script/760001
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.