Can we test Face ID in simulator?

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.

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

import LocalAuthenticationclass 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")                        }                    }                })            })        }    }}

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