Fix LockSettingsServiceTest

* Mock out registerReceiverAsUser() to avoid SecurityException
* Mock out setKeystorePassword() to not call into the real keystore

Bug: 170661840
Test: atest com.android.server.locksettings
Change-Id: I97c33f3b21ac16d2bb92e1658c222e4d0fd1970e

services/core/java/com/android/server/locksettings/LockSettingsService.java

@@ -1259,7 +1259,8 @@ public class LockSettingsService extends ILockSettings.Stub {
         return getCredentialTypeInternal(userId) != CREDENTIAL_TYPE_NONE;
     }
 
-    private void setKeystorePassword(byte[] password, int userHandle) {
+    @VisibleForTesting /** Note: this method is overridden in unit tests */
+    void setKeystorePassword(byte[] password, int userHandle) {
         AndroidKeyStoreMaintenance.onUserPasswordChanged(userHandle, password);
     }
 

services/tests/servicestests/src/com/android/server/locksettings/LockSettingsServiceTestable.java

@@ -208,4 +208,9 @@ public class LockSettingsServiceTestable extends LockSettingsService {
             parcel.recycle();
         }
     }
-}
+
+    @Override
+    void setKeystorePassword(byte[] password, int userHandle) {
+
+    }
+}

services/tests/servicestests/src/com/android/server/locksettings/MockLockSettingsContext.java

@@ -20,11 +20,16 @@ import android.app.KeyguardManager;
 import android.app.NotificationManager;
 import android.app.admin.DevicePolicyManager;
 import android.app.trust.TrustManager;
+import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.ContextWrapper;
+import android.content.Intent;
+import android.content.IntentFilter;
 import android.content.pm.PackageManager;
 import android.hardware.face.FaceManager;
 import android.hardware.fingerprint.FingerprintManager;
+import android.os.Handler;
+import android.os.UserHandle;
 import android.os.UserManager;
 import android.os.storage.StorageManager;
 
@@ -94,4 +99,11 @@ public class MockLockSettingsContext extends ContextWrapper {
     public int checkCallingOrSelfPermission(String permission) {
         return PackageManager.PERMISSION_GRANTED;
     }
+
+    @Override
+    public Intent registerReceiverAsUser(BroadcastReceiver receiver,
+            UserHandle user, IntentFilter filter, String broadcastPermission,
+            Handler scheduler) {
+        return null;
+    }
 }