Add toggleTouchIdEnrollment function

src/main/java/io/appium/java_client/MobileCommand.java

@@ -57,6 +57,7 @@ public class MobileCommand {
     //iOS
     protected static final String SHAKE;
     protected static final String TOUCH_ID;
+    protected static final String TOUCH_ID_ENROLLMENT;
     //Android
     protected static final String CURRENT_ACTIVITY;
     protected static final String END_TEST_COVERAGE;
@@ -103,6 +104,7 @@ public class MobileCommand {
         LOCK = "lock";
         SHAKE = "shake";
         TOUCH_ID = "touchId";
+        TOUCH_ID_ENROLLMENT = "toggleEnrollTouchId";
 
         CURRENT_ACTIVITY = "currentActivity";
         END_TEST_COVERAGE = "endTestCoverage";
@@ -151,6 +153,8 @@ public class MobileCommand {
         //iOS
         commandRepository.put(SHAKE, postC("/session/:sessionId/appium/device/shake"));
         commandRepository.put(TOUCH_ID, postC("/session/:sessionId/appium/simulator/touch_id"));
+        commandRepository.put(TOUCH_ID_ENROLLMENT,
+                postC("/session/:sessionId/appium/simulator/toggle_touch_id_enrollment"));
         //Android
         commandRepository.put(CURRENT_ACTIVITY,
                         getC("/session/:sessionId/appium/device/current_activity"));

src/main/java/io/appium/java_client/ios/IOSMobileCommandHelper.java

@@ -77,4 +77,14 @@ public class IOSMobileCommandHelper extends MobileCommand {
         return new AbstractMap.SimpleEntry<>(
             TOUCH_ID, prepareArguments("match", match));
     }
+
+    /**
+     * This method forms a {@link java.util.Map} of parameters for the toggling touchId
+     * enrollment in simulator.
+     *
+     */
+    public static Map.Entry<String, Map<String, ?>> toggleTouchIdEnrollmentCommand() {
+        return new AbstractMap.SimpleEntry<>(
+                TOUCH_ID_ENROLLMENT, ImmutableMap.<String, Object>of());
+    }
 }

src/main/java/io/appium/java_client/ios/PerformsTouchID.java

@@ -17,6 +17,7 @@
 package io.appium.java_client.ios;
 
 import static io.appium.java_client.ios.IOSMobileCommandHelper.touchIdCommand;
+import static io.appium.java_client.ios.IOSMobileCommandHelper.toggleTouchIdEnrollmentCommand;
 
 import io.appium.java_client.CommandExecutionHelper;
 import io.appium.java_client.ExecutesMethod;
@@ -31,4 +32,12 @@ public interface PerformsTouchID extends ExecutesMethod {
     default void performTouchID(boolean match) {
         CommandExecutionHelper.execute(this, touchIdCommand(match));
     }
+
+    /**
+     * Enrolls touchId in iOS Simulators.
+     *
+     */
+    default void toggleTouchIDEnrollment() {
+        CommandExecutionHelper.execute(this, toggleTouchIdEnrollmentCommand());
+    }
 }

src/test/java/io/appium/java_client/ios/AppXCUITTest.java

@@ -29,6 +29,7 @@ public class AppXCUITTest extends BaseIOSTest {
         capabilities.setCapability(MobileCapabilityType.BROWSER_NAME, "");
         capabilities.setCapability(MobileCapabilityType.PLATFORM_VERSION, "10.1");
         capabilities.setCapability(MobileCapabilityType.DEVICE_NAME, "iPhone 6");
+        capabilities.setCapability(IOSMobileCapabilityType.ALLOW_TOUCHID_ENROLL, "true");
         //sometimes environment has performance problems
         capabilities.setCapability(IOSMobileCapabilityType.LAUNCH_TIMEOUT, 500000);
         capabilities

src/test/java/io/appium/java_client/ios/XCUIAutomationTest.java

@@ -48,6 +48,7 @@ public class XCUIAutomationTest extends AppXCUITTest {
 
     @Test public void testTouchId() {
         try {
+            driver.toggleTouchIDEnrollment();
             driver.performTouchID(true);
             driver.performTouchID(false);
             assertEquals(true, true);