Moya: How do I make Moya respond with a fixed status code for testing?

[solidfox]

I have written a lot of error handling code for really improbable response status codes from the server. Now I want to test it. Do I send a message to the server guy and ask him to break the server or can I make my testing provider return status codes other than 200?

[colinta]

This sounds like a great use case for sampleResponseClosure! I'm going to pull an example from the Ello app (https://github.com/ello/ello-ios - ElloProvider_Specs.swift)

You just need to configure a Provider instance to return errors - this is a little different from stubbing:

static func errorEndpointsClosure(target: ElloAPI) -> Endpoint<ElloAPI> {
    let sampleResponseClosure = { () -> EndpointSampleResponse in
        return .NetworkResponse(500, NSData())  // you can & should have this configurable - globals, or properties on your Target
    }

    // all the request properties should be the same as your default provider
    let method = target.method
    let parameters = target.parameters
    let endpoint = Endpoint<ElloAPI>(URL: url(target),
        sampleResponseClosure: sampleResponseClosure,  // <- here goes!
        method: method, parameters: parameters)
    return endpoint.endpointByAddingHTTPHeaderFields(target.headers())
}

[colinta]

Ok so that's the first half - the second half is to configure a Provider to _use_ this "endpoint generator"

public static func ErrorStubbingProvider() -> MoyaProvider<ElloAPI> {
    return MoyaProvider<ElloAPI>(endpointClosure: errorEndpointsClosure, stubClosure: MoyaProvider.ImmediatelyStub)
}

[colinta]

In the Ello specs, we use this by assigning globals in our setup code, and assigning this provider as the "default provider"

ElloProvider.sharedProvider = ElloProvider.ErrorStubbingProvider()
ElloProvider_Specs.errorStatusCode = .Status502  // this is an enum we define in ErrorStatusCode.swift

[solidfox]

Sorry about the late response to an incredibly quick response! This does indeed look like it's the way to do it. Just the answer I was looking for, many thanks!

[colinta]

👍 Close it up!