库代码和测试代码是2个不同的模块。因此，您必须将库导入测试代码，并使您想要测试的函数公开，例如：

  public class Utils：NSObject {
 public class func cleanString（input：String，trim：Bool） - > String {
 // ... 
} 
} 
 

和

  import XCTest 
 import Utils 

 class AppTests：XCTestCase {
 func testConfiguratio（）{
 Utils.cleanString（foo，trim：true）
} 
} 
 

如果您想查看工作代码，请查看我的IBANtools库项目它实现了这个场景（类函数，swift框架，大量的测试）。

I have an Swift Xcode project with code such as:

class Utils: NSObject {
    class func cleanString (input: String, trim: Bool) -> String {
        // ...
    }
}

and then I try to test it:

import XCTest

class AppTests: XCTestCase {
    func testConfiguratio() {
        Utils.cleanString("foo", trim: true)
    }
}

but I get this error:

/Users/pupeno/Projects/macninja/AppTests/AppTests.swift:35:9: Use of unresolved identifier 'Utils'

I have Host Application APIs enabled:

What am I missing?

As it has been said already, the library code and the test code are 2 different modules. So you have to import the library into the test code and also make the functions that you want to test public, e.g:

public class Utils: NSObject {
    public class func cleanString (input: String, trim: Bool) -> String {
        // ...
    }
}

and

import XCTest
import Utils

class AppTests: XCTestCase {
    func testConfiguratio() {
        Utils.cleanString("foo", trim: true)
    }
}

If you want to see working code look at my IBANtools library project which implements exactly this scenario (class functions, swift framework, lots of testing).