diff --git a/tests/unit/src/com/android/settings/network/telephony/PreferredNetworkModePreferenceControllerTest.java b/tests/unit/src/com/android/settings/network/telephony/PreferredNetworkModePreferenceControllerTest.java
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index 00000000000..f9750554459
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+++ b/tests/unit/src/com/android/settings/network/telephony/PreferredNetworkModePreferenceControllerTest.java
@@ -0,0 +1,181 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.network.telephony;
+
+import static com.android.settings.core.BasePreferenceController.AVAILABLE;
+import static com.android.settings.core.BasePreferenceController.CONDITIONALLY_UNAVAILABLE;
+import static com.android.settings.network.telephony.MobileNetworkUtils.getRafFromNetworkType;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+import android.os.PersistableBundle;
+import android.provider.Settings;
+import android.telephony.CarrierConfigManager;
+import android.telephony.ServiceState;
+import android.telephony.SubscriptionManager;
+import android.telephony.TelephonyManager;
+
+import androidx.preference.ListPreference;
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import com.android.settings.R;
+import com.android.settings.network.telephony.TelephonyConstants.TelephonyManagerConstants;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+@RunWith(AndroidJUnit4.class)
+public class PreferredNetworkModePreferenceControllerTest {
+    private static final int SUB_ID = 2;
+
+    @Mock
+    private TelephonyManager mTelephonyManager;
+    @Mock
+    private TelephonyManager mInvalidTelephonyManager;
+    @Mock
+    private CarrierConfigManager mCarrierConfigManager;
+    @Mock
+    private ServiceState mServiceState;
+
+    private PersistableBundle mPersistableBundle;
+    private PreferredNetworkModePreferenceController mController;
+    private ListPreference mPreference;
+    private Context mContext;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+
+        mContext = spy(ApplicationProvider.getApplicationContext());
+        when(mContext.getSystemService(Context.TELEPHONY_SERVICE)).thenReturn(mTelephonyManager);
+        when(mContext.getSystemService(TelephonyManager.class)).thenReturn(mTelephonyManager);
+        when(mContext.getSystemService(CarrierConfigManager.class)).thenReturn(mCarrierConfigManager);
+
+        doReturn(mTelephonyManager).when(mTelephonyManager).createForSubscriptionId(SUB_ID);
+        doReturn(mInvalidTelephonyManager).when(mTelephonyManager).createForSubscriptionId(
+                SubscriptionManager.INVALID_SUBSCRIPTION_ID);
+        doReturn(mServiceState).when(mTelephonyManager).getServiceState();
+        mPersistableBundle = new PersistableBundle();
+        doReturn(mPersistableBundle).when(mCarrierConfigManager).getConfigForSubId(SUB_ID);
+
+        mPreference = new ListPreference(mContext);
+        mController = new PreferredNetworkModePreferenceController(mContext, "mobile_data");
+        mController.init(SUB_ID);
+        mPreference.setKey(mController.getPreferenceKey());
+    }
+
+    @After
+    public void tearDown() {
+        Settings.Global.putInt(
+            mContext.getContentResolver(), Settings.Global.PREFERRED_NETWORK_MODE + SUB_ID, 0);
+    }
+
+    @Test
+    public void getAvailabilityStatus_hideCarrierNetworkSettings_returnUnavailable() {
+        mPersistableBundle.putBoolean(CarrierConfigManager.KEY_HIDE_CARRIER_NETWORK_SETTINGS_BOOL,
+                true);
+
+        assertThat(mController.getAvailabilityStatus()).isEqualTo(CONDITIONALLY_UNAVAILABLE);
+    }
+
+    @Test
+    public void getAvailabilityStatus_worldPhone_returnAvailable() {
+        mPersistableBundle.putBoolean(CarrierConfigManager.KEY_HIDE_CARRIER_NETWORK_SETTINGS_BOOL,
+                false);
+        mPersistableBundle.putBoolean(CarrierConfigManager.KEY_WORLD_PHONE_BOOL, true);
+
+        assertThat(mController.getAvailabilityStatus()).isEqualTo(AVAILABLE);
+    }
+
+    @Test
+    public void getAvailabilityStatus_hidePreferredNetworkType_returnUnavailable() {
+        mPersistableBundle.putBoolean(CarrierConfigManager.KEY_HIDE_PREFERRED_NETWORK_TYPE_BOOL,
+                true);
+
+        when(mServiceState.getState()).thenReturn(ServiceState.STATE_OUT_OF_SERVICE);
+        when(mServiceState.getDataRegistrationState()).thenReturn(
+                ServiceState.STATE_OUT_OF_SERVICE);
+        assertThat(mController.getAvailabilityStatus()).isEqualTo(CONDITIONALLY_UNAVAILABLE);
+
+        when(mServiceState.getState()).thenReturn(ServiceState.STATE_IN_SERVICE);
+        when(mServiceState.getDataRegistrationState()).thenReturn(ServiceState.STATE_IN_SERVICE);
+
+        when(mServiceState.getRoaming()).thenReturn(false);
+        assertThat(mController.getAvailabilityStatus()).isEqualTo(CONDITIONALLY_UNAVAILABLE);
+
+        when(mServiceState.getRoaming()).thenReturn(true);
+        assertThat(mController.getAvailabilityStatus()).isEqualTo(CONDITIONALLY_UNAVAILABLE);
+    }
+
+    @Test
+    public void updateState_updateByNetworkMode() {
+        Settings.Global.putInt(mContext.getContentResolver(),
+                Settings.Global.PREFERRED_NETWORK_MODE + SUB_ID,
+                TelephonyManagerConstants.NETWORK_MODE_TDSCDMA_GSM_WCDMA);
+
+        mController.updateState(mPreference);
+
+        assertThat(mPreference.getValue()).isEqualTo(
+                String.valueOf(TelephonyManagerConstants.NETWORK_MODE_TDSCDMA_GSM_WCDMA));
+        assertThat(mPreference.getSummary()).isEqualTo(
+                resourceString("preferred_network_mode_tdscdma_gsm_wcdma_summary"));
+    }
+
+    @Test
+    public void onPreferenceChange_updateSuccess() {
+        doReturn(true).when(mTelephonyManager).setPreferredNetworkTypeBitmask(
+                getRafFromNetworkType(TelephonyManagerConstants.NETWORK_MODE_LTE_TDSCDMA));
+
+        mController.onPreferenceChange(mPreference,
+                String.valueOf(TelephonyManagerConstants.NETWORK_MODE_LTE_TDSCDMA));
+
+        assertThat(Settings.Global.getInt(mContext.getContentResolver(),
+                Settings.Global.PREFERRED_NETWORK_MODE + SUB_ID, 0)).isEqualTo(
+                TelephonyManagerConstants.NETWORK_MODE_LTE_TDSCDMA);
+    }
+
+    @Test
+    public void onPreferenceChange_updateFail() {
+        doReturn(false).when(mTelephonyManager).setPreferredNetworkTypeBitmask(
+            getRafFromNetworkType(TelephonyManagerConstants.NETWORK_MODE_LTE_TDSCDMA));
+
+        mController.onPreferenceChange(mPreference,
+                String.valueOf(TelephonyManagerConstants.NETWORK_MODE_LTE_TDSCDMA));
+
+        assertThat(Settings.Global.getInt(mContext.getContentResolver(),
+                Settings.Global.PREFERRED_NETWORK_MODE + SUB_ID, 0)).isNotEqualTo(
+                TelephonyManagerConstants.NETWORK_MODE_LTE_TDSCDMA);
+    }
+
+    public int resourceId(String type, String name) {
+        return mContext.getResources().getIdentifier(name, type, mContext.getPackageName());
+    }
+
+    public String resourceString(String name) {
+        return mContext.getResources().getString(resourceId("string", name));
+    }
+}