Agent skill

fosmvvm-serverrequest-test-generator

Generate comprehensive ServerRequest tests using VaporTesting infrastructure. Use when testing any ServerRequest type (ShowRequest, ViewModelRequest, CreateRequest, UpdateRequest, DeleteRequest) against a Vapor server.

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SKILL.md

FOSMVVM ServerRequest Test Generator

Generate test files for ServerRequest types using VaporTesting infrastructure.

Conceptual Foundation

For full architecture context, see FOSMVVMArchitecture.md

ServerRequest testing uses VaporTesting infrastructure to send typed requests through the full server stack:

┌─────────────────────────────────────────────────────────────────────┐
│                    ServerRequest Test Flow                           │
├─────────────────────────────────────────────────────────────────────┤
│                                                                      │
│  Test Code:                                                          │
│    let request = MyRequest(query: .init(...))                        │
│    app.testing().test(request, locale: en) { response in }           │
│                                                                      │
│  Infrastructure handles:                                             │
│    • Path derivation from type name (MyRequest → /my)                │
│    • HTTP method from action (ShowRequest → GET)                     │
│    • Query/body encoding                                             │
│    • Header injection (locale, version)                              │
│    • Response decoding to ResponseBody type                          │
│                                                                      │
│  You verify:                                                         │
│    • response.status (HTTPStatus)                                    │
│    • response.body (R.ResponseBody? - typed!)                        │
│    • response.error (R.ResponseError? - typed!)                      │
│                                                                      │
└─────────────────────────────────────────────────────────────────────┘

STOP AND READ THIS

Testing ServerRequests uses VaporTesting infrastructure. No manual URL construction. Ever.

┌──────────────────────────────────────────────────────────────────────┐
│          SERVERREQUEST TESTING USES TestingApplicationTester          │
├──────────────────────────────────────────────────────────────────────┤
│                                                                       │
│  1. Configure Vapor Application with routes                           │
│  2. Use app.testing().test(request, locale:) { response in }          │
│  3. Verify response.status, response.body, response.error             │
│                                                                       │
│  TestingServerRequestResponse<R> provides TYPED access to:            │
│    • status: HTTPStatus                                               │
│    • headers: HTTPHeaders                                             │
│    • body: R.ResponseBody?     ← Auto-decoded!                        │
│    • error: R.ResponseError?   ← Auto-decoded!                        │
│                                                                       │
└──────────────────────────────────────────────────────────────────────┘

What You Must NEVER Do

swift
// ❌ WRONG - manual URL construction
let url = URL(string: "http://localhost:8080/my_request?query=value")!
let response = try await URLSession.shared.data(from: url)

// ❌ WRONG - string path with method
try await app.test(.GET, "/my_request") { response in }

// ❌ WRONG - manual JSON encoding/decoding
let json = try JSONEncoder().encode(requestBody)
let decoded = try JSONDecoder().decode(ResponseBody.self, from: data)

// ❌ WRONG - constructing TestingHTTPRequest manually
let httpRequest = TestingHTTPRequest(method: .GET, url: "/path", headers: headers)
try await app.testing().performTest(request: httpRequest)

What You Must ALWAYS Do

swift
// ✅ RIGHT - Use TestingApplicationTester.test() with ServerRequest
let request = MyShowRequest(query: .init(userId: userId))
try await app.testing().test(request, locale: en) { response in
    #expect(response.status == .ok)
    #expect(response.body?.viewModel.name == "Expected Name")
}

// ✅ RIGHT - Test multiple locales
for locale in [en, es] {
    try await app.testing().test(request, locale: locale) { response in
        #expect(response.status == .ok)
        // Localized values are automatically handled
    }
}

// ✅ RIGHT - Test error responses
let badRequest = MyShowRequest(query: .init(userId: invalidId))
try await app.testing().test(badRequest, locale: en) { response in
    #expect(response.status == .notFound)
    #expect(response.error != nil)
}

The path is derived from the ServerRequest type. HTTP method comes from the action. Headers are automatic. You NEVER write URL strings or decode JSON manually.

When to Use This Skill

  • Testing any ServerRequest implementation
  • Verifying server responses for CRUD operations
  • Testing error handling and edge cases
  • Multi-locale response verification
  • Integration testing between client request types and server controllers

If you're about to write URLSession, app.test(.GET, "/path"), or manual JSON decoding, STOP and use this skill instead.

What This Skill Generates

File Location Purpose
{Feature}RequestTests.swift Tests/{Target}Tests/Requests/ Test suite for ServerRequest
Test YAML (if needed) Tests/{Target}Tests/TestYAML/ Localization for test ViewModels

Project Structure Configuration

Placeholder Description Example
{Feature} Feature or entity name (PascalCase) Idea, User, Dashboard
{Target} Server test target WebServerTests, AppTests
{ViewModelsTarget} Shared ViewModels SPM target ViewModels
{WebServerTarget} Server-side target WebServer, AppServer
{ResourceDir} YAML resource directory TestYAML, Resources

Key Types

TestingServerRequestResponse<R>

Wraps HTTP response with typed access:

Property Type Description
status HTTPStatus HTTP status code (.ok, .notFound, etc.)
headers HTTPHeaders Response headers
body R.ResponseBody? Typed response body (auto-decoded)
error R.ResponseError? Typed error (auto-decoded)

TestingApplicationTester Extension

swift
func test<R: ServerRequest>(
    _ request: R,
    locale: Locale = en,
    headers: HTTPHeaders = [:],
    afterResponse: (TestingServerRequestResponse<R>) async throws -> Void
) async throws -> any TestingApplicationTester

Convenience Locales

Available on TestingApplicationTester:

  • en - English
  • enUS - English (US)
  • enGB - English (UK)
  • es - Spanish

Test Structure

Basic Test Suite

swift
import FOSFoundation
@testable import FOSMVVM
import FOSTesting
import FOSTestingVapor
import Foundation
import Testing
import Vapor
import VaporTesting

@Suite("MyFeature Request Tests")
struct MyFeatureRequestTests {
    @Test func showRequest_success() async throws {
        try await withTestApp { app in
            let request = MyShowRequest(query: .init(id: validId))

            try await app.testing().test(request, locale: en) { response in
                #expect(response.status == .ok)
                #expect(response.body?.viewModel != nil)
            }
        }
    }

    @Test func showRequest_notFound() async throws {
        try await withTestApp { app in
            let request = MyShowRequest(query: .init(id: invalidId))

            try await app.testing().test(request, locale: en) { response in
                #expect(response.status == .notFound)
            }
        }
    }
}

private func withTestApp(_ test: (Application) async throws -> Void) async throws {
    try await withApp { app in
        // Configure routes
        try app.routes.register(collection: MyController())
        try await test(app)
    }
}

Testing Different Request Types

Request Type HTTP Method What to Test
ShowRequest GET Query params, response body, localization
ViewModelRequest GET ViewModel population, all localized fields
CreateRequest POST RequestBody validation, created entity, ID response
UpdateRequest PATCH RequestBody validation, updated entity, response
DeleteRequest DELETE Entity removal, status code

Generation Process

Step 1: Identify ServerRequest to Test

Determine which ServerRequest types need coverage:

  • New ServerRequest being created
  • Existing ServerRequest without tests
  • ServerRequest with localized ResponseBody

Step 2: Create Test Suite

Generate test file conforming to testing patterns:

  • One @Test function per scenario (success, not found, validation error, etc.)
  • Use app.testing().test(request, locale:) for ALL request testing
  • Verify both success and error paths

Step 3: Configure Test Application

Set up Vapor Application with required:

  • Localization store (if ResponseBody has localized fields)
  • Route registration for the controller
  • Database configuration (if testing persistence)

Step 4: Run Tests

bash
swift test --filter {TestSuiteName}

Common Scenarios

Testing ViewModelRequest with Localization

swift
@Test func viewModelRequest_multiLocale() async throws {
    try await withTestApp { app in
        let request = DashboardViewModelRequest()

        // Test English
        try await app.testing().test(request, locale: en) { response in
            #expect(response.status == .ok)
            let vm = try #require(response.body)
            #expect(try vm.pageTitle.localizedString == "Dashboard")
        }

        // Test Spanish
        try await app.testing().test(request, locale: es) { response in
            #expect(response.status == .ok)
            let vm = try #require(response.body)
            #expect(try vm.pageTitle.localizedString == "Tablero")
        }
    }
}

Testing CreateRequest with Validation

swift
@Test func createRequest_validInput() async throws {
    try await withTestApp { app in
        let request = CreateIdeaRequest(requestBody: .init(
            content: "Valid idea content"
        ))

        try await app.testing().test(request, locale: en) { response in
            #expect(response.status == .ok)
            #expect(response.body?.id != nil)
        }
    }
}

@Test func createRequest_invalidInput() async throws {
    try await withTestApp { app in
        let request = CreateIdeaRequest(requestBody: .init(
            content: ""  // Empty content should fail validation
        ))

        try await app.testing().test(request, locale: en) { response in
            #expect(response.status == .badRequest)
            #expect(response.error != nil)
        }
    }
}

Testing UpdateRequest

swift
@Test func updateRequest_success() async throws {
    try await withTestApp { app in
        // First create an entity
        let createRequest = CreateIdeaRequest(requestBody: .init(content: "Original"))
        var createdId: ModelIdType?
        try await app.testing().test(createRequest, locale: en) { response in
            createdId = response.body?.id
        }

        // Then update it
        let updateRequest = UpdateIdeaRequest(requestBody: .init(
            ideaId: try #require(createdId),
            content: "Updated content"
        ))

        try await app.testing().test(updateRequest, locale: en) { response in
            #expect(response.status == .ok)
            #expect(response.body?.viewModel.content == "Updated content")
        }
    }
}

Testing DeleteRequest

swift
@Test func deleteRequest_success() async throws {
    try await withTestApp { app in
        // Create, then delete
        let deleteRequest = DeleteIdeaRequest(requestBody: .init(ideaId: existingId))

        try await app.testing().test(deleteRequest, locale: en) { response in
            #expect(response.status == .ok)
        }

        // Verify deleted (should return not found)
        let showRequest = ShowIdeaRequest(query: .init(ideaId: existingId))
        try await app.testing().test(showRequest, locale: en) { response in
            #expect(response.status == .notFound)
        }
    }
}

Testing ShowRequest with Query Parameters

swift
@Test func showRequest_withQuery() async throws {
    try await withTestApp { app in
        let request = UserShowRequest(query: .init(
            userId: userId,
            includeDetails: true
        ))

        try await app.testing().test(request, locale: en) { response in
            #expect(response.status == .ok)
            #expect(response.body?.user.details != nil)
        }
    }
}

Troubleshooting

"Route not found" Error

Cause: Controller not registered in test app.

Fix: Register the controller before testing:

swift
try app.routes.register(collection: MyController())

Response body is nil but status is .ok

Cause: JSON decoding failed silently.

Fix: Check that ResponseBody type matches server response exactly. Use response.headers to verify Content-Type.

Localization not applied

Cause: Locale not passed to encoder.

Fix: The test(_:locale:) method handles this automatically. Ensure you're passing the locale parameter.

"Missing Translation" in Response

Cause: YAML localization not loaded.

Fix: Initialize localization store in test app setup:

swift
try app.initYamlLocalization(
    bundle: Bundle.module,
    resourceDirectoryName: "TestYAML"
)

Naming Conventions

Concept Convention Example
Test suite {Feature}RequestTests IdeaRequestTests
Test file {Feature}RequestTests.swift IdeaRequestTests.swift
Test method (success) {action}Request_success showRequest_success
Test method (error) {action}Request_{errorCase} showRequest_notFound
Test method (validation) {action}Request_{validationCase} createRequest_emptyContent
Test helper withTestApp withTestApp { app in }
Locale constant en, es, enUS, enGB locale: en

Collaboration Protocol

  1. Identify the ServerRequest to test - Which request type needs coverage?
  2. Confirm test scenarios - Success paths, error paths, validation errors
  3. Generate test file - One file per feature/request area
  4. Verify route registration - Ensure controller is registered in test app
  5. Run tests - swift test --filter {TestSuiteName}

File Templates

See reference.md for complete file templates.

See Also

  • FOSMVVMArchitecture.md - Full architecture
  • fosmvvm-serverrequest-generator - Creating ServerRequest types
  • fosmvvm-viewmodel-test-generator - Testing ViewModels (localization only)
  • reference.md - Complete file templates

Version History

Version Date Changes
1.0 2025-01-05 Initial skill

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