ピンの色を個別に変更したいのですが、現在地アイコンまでピンになってしまいます。

import UIKit
import CoreLocation
import MapKit

class ViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate {
    var myLock = NSLock()
    let goldenRatio = 1.618
    
    @IBOutlet var mapView: MKMapView!
    var locationManager: CLLocationManager!
    
    @IBAction func clickZoomin(_ sender: Any) {
        print("[DBG]clickZoomin")
        myLock.lock()
        if (0.005 < mapView.region.span.latitudeDelta / goldenRatio) {
            print("[DBG]latitudeDelta-1 : " + mapView.region.span.latitudeDelta.description)
            var regionSpan:MKCoordinateSpan = MKCoordinateSpan()
            regionSpan.latitudeDelta = mapView.region.span.latitudeDelta / goldenRatio
            mapView.region.span = regionSpan
            print("[DBG]latitudeDelta-2 : " + mapView.region.span.latitudeDelta.description)
        }
        myLock.unlock()
    }
    
    @IBAction func clickZoomout(_ sender: Any) {
        print("[DBG]clickZoomout")
        myLock.lock()
        if (mapView.region.span.latitudeDelta * goldenRatio < 150.0) {
            print("[DBG]latitudeDelta-1 : " + mapView.region.span.latitudeDelta.description)
            var regionSpan:MKCoordinateSpan = MKCoordinateSpan()
            regionSpan.latitudeDelta = mapView.region.span.latitudeDelta * goldenRatio
            //            regionSpan.latitudeDelta = mapView.region.span.longitudeDelta * GoldenRatio
            mapView.region.span = regionSpan
            print("[DBG]latitudeDelta-2 : " + mapView.region.span.latitudeDelta.description)
        }
        myLock.unlock()
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let annotation = TestMKPointAnnotation()
        let annotation2 = TestMKPointAnnotation()
        let annotation3 = TestMKPointAnnotation()
        let annotation4 = TestMKPointAnnotation()
        let annotation5 = TestMKPointAnnotation()
        let annotation6 = TestMKPointAnnotation()
        let annotation7 = TestMKPointAnnotation()
        let annotation8 = TestMKPointAnnotation()
        let annotation9 = TestMKPointAnnotation()
        
        annotation.title = "山崎駅";
        annotation.subtitle = "JR西日本";
        annotation.coordinate = CLLocationCoordinate2DMake(34.892323, 135.6793405);
        
        annotation2.title = "河内堅上駅";
        annotation2.subtitle = "JR西日本";
        annotation2.coordinate = CLLocationCoordinate2DMake(34.5742328, 135.6632028);
        
        annotation3.title = "京都鉄道博物館";
        annotation3.subtitle = "JR西日本";
        annotation3.coordinate = CLLocationCoordinate2DMake(34.9869056, 135.742733);
        
        annotation4.title = "サントリーカーブ";
        annotation4.subtitle = "JR西日本";
        annotation4.coordinate = CLLocationCoordinate2DMake(34.891324, 135.674206);
        
        annotation5.title = "島本駅";
        annotation5.subtitle = "JR西日本";
        annotation5.coordinate = CLLocationCoordinate2DMake(34.8806111, 135.6627284);
        
        annotation6.title = "東淀川駅";
        annotation6.subtitle = "JR西日本";
        annotation6.coordinate = CLLocationCoordinate2DMake(34.7392934, 135.5040161);
        
        annotation7.title = "丑寅第一踏切";
        annotation7.subtitle = "JR西日本";
        annotation7.coordinate = CLLocationCoordinate2DMake(34.797566, 135.554972);
        
        mapView.addAnnotation(annotation)
        mapView.addAnnotation(annotation2)
        mapView.addAnnotation(annotation3)
        mapView.addAnnotation(annotation4)
        mapView.addAnnotation(annotation5)
        mapView.addAnnotation(annotation6)
        mapView.addAnnotation(annotation7)
        mapView.addAnnotation(annotation8)
        mapView.addAnnotation(annotation9)
        
        mapView.delegate = self
    }
    
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations:[CLLocation]) {
        let longitude = (locations.last?.coordinate.longitude.description)!
        let latitude = (locations.last?.coordinate.latitude.description)!
        print("[DBG]longitude : " + longitude)
        print("[DBG]latitude : " + latitude)
        
        myLock.lock()
        myLock.unlock()
    }
    
    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
 
        let testPinView = MKMarkerAnnotationView()
        
        testPinView.annotation = annotation
 
        if let test = annotation as? TestMKPointAnnotation {
            testPinView.markerTintColor = test.markerColor
        }
        
        testPinView.canShowCallout = true
 
        return testPinView
    }
    
    @IBAction func NowLocation(_ sender: Any) {
        locationManager = CLLocationManager()
        
        locationManager.startUpdatingLocation()
        
        locationManager.delegate = self
        
        locationManager.requestWhenInUseAuthorization()
        
        mapView.showsUserLocation = true
    }
    
}

import UIKit
import MapKit

class TestMKPointAnnotation: MKPointAnnotation {

    var markerColor:UIColor = UIColor.tintColor
}