# Chapter 11: Testing got IOError in swift-nio

**URL:** <https://forums.kodeco.com/t/chapter-11-testing-got-ioerror-in-swift-nio/82882>\
**Category:** Server Side Swift with Vapor\
**Created:** [September 25, 2019, 11:11am UTC](https://forums.kodeco.com/t/chapter-11-testing-got-ioerror-in-swift-nio/82882 "2019-09-25T11:11:42Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![lanaya\_hsieh](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/lanaya_hsieh/32/103136_2.png) [@lanaya\_hsieh](https://forums.kodeco.com/u/lanaya_hsieh)\
**Post date:** [September 25, 2019, 11:11am UTC](https://forums.kodeco.com/t/chapter-11-testing-got-ioerror-in-swift-nio/82882/1 "2019-09-25T11:11:43Z")

</div>

Hello gays, today I just wrote my first test case for vapor but got puzzled error in it.

Here is my code:

```swift
@testable import App
import Vapor
import XCTest
import FluentPostgreSQL

final class UserTests: XCTestCase {
  
  func testUsersCanBeRetrievedFromAPI() throws {
    // 1
    let expectedName = "Alice"
    let expectedUserName = "alice"
    
    // 2
    var config = Config.default()
    var services = Services.default()
    var env = Environment.testing
    try App.configure(&config, &env, &services)
    let app = try Application(config: config, environment: env, services: services)
    try App.boot(app)
    
    // 3
    let conn = try app.newConnection(to: .psql).wait()
    
    // 4
    let user = User(name: expectedName, username: expectedUserName)
    let savedUser = try user.save(on: conn).wait()
    _ = try User(name: "Luke", username: "luke")
      .save(on: conn).wait()
    
    // 5
    let responder = try app.make(Responder.self)
    
    // 6
    let request = HTTPRequest(method: .GET, url: URL(string: "/api/users")!)
    let wrappedRequest = Request(http: request, using: app)
    
    // 7
    let response = try responder.respond(to: wrappedRequest).wait()
    
    // 8
    let data = response.http.body.data
    let users = try JSONDecoder().decode([User].self, from: data!)
    
    // 9
    XCTAssertEqual(users.count, 2)
    XCTAssertEqual(users[0].name, expectedName)
    XCTAssertEqual(users[0].username, expectedUserName)
    XCTAssertEqual(users[0].id, savedUser.id)
    
    // 10
    conn.close()
  }
}

```

I did create Postgres in docker by:

```auto
docker run --name postgres-test -e POSTGRES_DB=vapor-test \
-e POSTGRES_USER=vapor -e POSTGRES_PASSWORD=password \
-p 5433:5432 -d postgres

```

And my code stop in here:

```swift
@inline(__always)
@discardableResult
internal func wrapSyscall<T: FixedWidthInteger>(where function: StaticString = #function, _ body: () throws -> T) throws -> T {
    while true {
        let res = try body()
        if res == -1 {
            let err = errno
            if err == EINTR {
                continue
            }
            assertIsNotBlacklistedErrno(err: err, where: function)
            throw IOError(errnoCode: err, function: function)
        }
        return res
    }
}

```

The lldb print err is **57** and function is **“getpeername(socket:address:addressLength:)”**

* * *

Xcode Version 11.0 (11A420a)  
MacOS Version 10.14.6  
Vapor: 3.3.0

---

<div class="post-metadata">

**Author:** ![0xtim](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/0xtim/32/111111_2.png) [@0xtim](https://forums.kodeco.com/u/0xtim)\
**Post date:** [September 25, 2019, 1:35pm UTC](https://forums.kodeco.com/t/chapter-11-testing-got-ioerror-in-swift-nio/82882/2 "2019-09-25T13:35:35Z")

</div>

That all looks valid. If you do `swift test` from the command line, what error do you get? Also what does your **configure.swift** look like for setting up the DB? Looks like a DB connection issue

---

<div class="post-metadata">

**Author:** ![lanaya\_hsieh](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/lanaya_hsieh/32/103136_2.png) [@lanaya\_hsieh](https://forums.kodeco.com/u/lanaya_hsieh)\
**Post date:** [September 25, 2019, 2:04pm UTC](https://forums.kodeco.com/t/chapter-11-testing-got-ioerror-in-swift-nio/82882/3 "2019-09-25T14:04:33Z")

</div>

I try to run swift test and here is the result:

```auto
$ swift test
[3/3] Linking TILAppPackageTests
Test Suite 'All tests' started at 2019-09-25 22:00:23.885
Test Suite 'TILAppPackageTests.xctest' started at 2019-09-25 22:00:23.885
Test Suite 'AppTests' started at 2019-09-25 22:00:23.885
Test Case '-[AppTests.AppTests testNothing]' started.
Test Case '-[AppTests.AppTests testNothing]' passed (0.081 seconds).
Test Suite 'AppTests' passed at 2019-09-25 22:00:23.966.
	 Executed 1 test, with 0 failures (0 unexpected) in 0.081 (0.081) seconds
Test Suite 'UserTests' started at 2019-09-25 22:00:23.966
Test Case '-[AppTests.UserTests testUsersCanBeRetrievedFromAPI]' started.
[INFO] Migrating 'psql' database (/Users/arco/Projects/vapor/TILApp/.build/checkouts/fluent/Sources/Fluent/Migration/MigrationConfig.swift:69)
[INFO] Migrations complete (/Users/arco/Projects/vapor/TILApp/.build/checkouts/fluent/Sources/Fluent/Migration/MigrationConfig.swift:73)
Test Case '-[AppTests.UserTests testUsersCanBeRetrievedFromAPI]' passed (0.126 seconds).
Test Suite 'UserTests' passed at 2019-09-25 22:00:24.092.
	 Executed 1 test, with 0 failures (0 unexpected) in 0.126 (0.126) seconds
Test Suite 'TILAppPackageTests.xctest' passed at 2019-09-25 22:00:24.092.
	 Executed 2 tests, with 0 failures (0 unexpected) in 0.206 (0.207) seconds
Test Suite 'All tests' passed at 2019-09-25 22:00:24.092.
	 Executed 2 tests, with 0 failures (0 unexpected) in 0.206 (0.207) seconds

```

And my configure.swift:

```swift
import FluentPostgreSQL
import Vapor

/// Called before your application initializes.
public func configure(_ config: inout Config, _ env: inout Environment, _ services: inout Services) throws {
  // Register providers first
  try services.register(FluentPostgreSQLProvider())

  // Register routes to the router
  let router = EngineRouter.default()
  try routes(router)
  services.register(router, as: Router.self)

  // Register middleware
  var middlewares = MiddlewareConfig() // Create _empty_ middleware config
  // middlewares.use(FileMiddleware.self) // Serves files from `Public/` directory
  middlewares.use(ErrorMiddleware.self) // Catches errors and converts to HTTP response
  services.register(middlewares)

  var databases = DatabasesConfig()
  
  let databaseName: String
  let databasePort: Int
  
  if env == .testing {
    databaseName = "vapor-test"
    databasePort = 5433
  } else {
    databaseName = "vapor"
    databasePort = 5432
  }
  
  let databaseConfig = PostgreSQLDatabaseConfig(
    hostname: "localhost",
    port: databasePort,
    username: "vapor",
    database: databaseName,
    password: "password"
  )

  let database = PostgreSQLDatabase(config: databaseConfig)
  databases.add(database: database, as: .psql)
  services.register(databases)

  // Configure migrations
  var migrations = MigrationConfig()
  migrations.add(model: User.self, database: .psql)
  migrations.add(model: Acronym.self, database: .psql)
  migrations.add(model: Category.self, database: .psql)
  migrations.add(model: AcronymCategoryPivot.self, database: .psql)
  services.register(migrations)
}

```

---

<div class="post-metadata">

**Author:** ![0xtim](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/0xtim/32/111111_2.png) [@0xtim](https://forums.kodeco.com/u/0xtim)\
**Post date:** [September 26, 2019, 8:16am UTC](https://forums.kodeco.com/t/chapter-11-testing-got-ioerror-in-swift-nio/82882/4 "2019-09-26T08:16:15Z")

</div>

So it works from the command line? 🤔

If you disable all breakpoints in Xcode do you get the same error?

---

<div class="post-metadata">

**Author:** ![lanaya\_hsieh](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/lanaya_hsieh/32/103136_2.png) [@lanaya\_hsieh](https://forums.kodeco.com/u/lanaya_hsieh)\
**Post date:** [September 28, 2019, 11:21am UTC](https://forums.kodeco.com/t/chapter-11-testing-got-ioerror-in-swift-nio/82882/5 "2019-09-28T11:21:29Z")

</div>

😅 After disable all the breakpoints, the test case can be passed now.  
Thank you!