Can we test Face ID in simulator?

Can we test biometric authentication using the simulator?

The iPhone X Simulator shows a menu for Face ID enrollment, but after enabling that, what can I do?

How it will recognize a face for authentication?

Simulator does not recognise a face but allows you to simulate a matching and non-matching faces, if you've enabled Enrolled option from Face ID.

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Add following code to your view controller and try with Face-ID

import LocalAuthentication

class ViewController: UIViewController {

    
    override func viewDidLoad() {
        super.viewDidLoad()
        localAuthentication()
    }

    
    
    func localAuthentication() -> Void {
        
        let laContext = LAContext()
        var error: NSError?
        let biometricsPolicy = LAPolicy.deviceOwnerAuthenticationWithBiometrics
        
        if (laContext.canEvaluatePolicy(biometricsPolicy, error: &error)) {
            
            if let laError = error {
                print("laError - \(laError)")
                return
            }
            
            var localizedReason = "Unlock device"
            if #available(iOS 11.0, *) {
                if (laContext.biometryType == LABiometryType.faceID) {
                    localizedReason = "Unlock using Face ID"
                    print("FaceId support")
                } else if (laContext.biometryType == LABiometryType.touchID) {
                    localizedReason = "Unlock using Touch ID"
                    print("TouchId support")
                } else {
                    print("No Biometric support")
                }
            } else {
                // Fallback on earlier versions
            }
            
            
            laContext.evaluatePolicy(biometricsPolicy, localizedReason: localizedReason, reply: { (isSuccess, error) in
                
                DispatchQueue.main.async(execute: {
                    
                    if let laError = error {
                        print("laError - \(laError)")
                    } else {
                        if isSuccess {
                            print("sucess")
                        } else {
                            print("failure")
                        }
                    }
                    
                })
            })
        }
        
        
    }
}

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FaceID authentication will prompt you for first time to allow FaceID detection for your app.

---

Now enable Face ID enrolment and run your app to test Face ID simulation Testing.

Here is simulation result for matching and non-matching faces.

Result for matching face:

Result for non-matching face:

---

The simulator just simulates the outcome of a correct and a failed face recognition, just like it does with Touch ID. It does not recognize faces.

As you asking but after enabling that, what can I do?

Just like a touch Id enrolment, You can verify things with face-Id on iPhone-X. However simulator have some limitations like Appstore etc. With face-Id enrolment you can do following things -

• Use Face ID to make purchases.
• Sign in with Face ID (Sign in to apps).
• Autofill passwords in Safari.
• In the iTunes Store, App Store, and iBooks Store.

See more at Apple

same as give by @krunal just 2nd if should be outside of 1st.

import LocalAuthentication

class ViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()
    localAuthentication()
}

func localAuthentication() -> Void {
    
    let laContext = LAContext()
    var error: NSError?
    let biometricsPolicy = LAPolicy.deviceOwnerAuthenticationWithBiometrics
    
    if (laContext.canEvaluatePolicy(biometricsPolicy, error: &error)) {
        
       
        
        var localizedReason = "Unlock device"
        if #available(iOS 11.0, *) {
            if (laContext.biometryType == LABiometryType.faceID) {
                localizedReason = "Unlock using Face ID"
                print("FaceId support")
            } else if (laContext.biometryType == LABiometryType.touchID) {
                localizedReason = "Unlock using Touch ID"
                print("TouchId support")
            } else {
                print("No Biometric support")
            }
        } else {
            // Fallback on earlier versions
        }
        
        
        laContext.evaluatePolicy(biometricsPolicy, localizedReason: localizedReason, reply: { (isSuccess, error) in
            
            DispatchQueue.main.async(execute: {
                
                if let laError = error {
                    print("laError - \(laError)")
                } else {
                    if isSuccess {
                        print("sucess")
                    } else {
                        print("failure")
                    }
                }
            })
        })
    }
//This should be outside of if
   
 if let laError = error {
        print("laError - \(laError)")
        return
     }
 }
}

See this article. You can create the Biometrics.m, Biometrics.h, and bridging-header.h files within you UITests folder and update your UI test target to use that bridging header. https://github.com/KaneCheshire/BiometricAutomationDemo