diff --git a/tests/unit/src/com/android/settings/network/telephony/MmsMessagePreferenceControllerTest.java b/tests/unit/src/com/android/settings/network/telephony/MmsMessagePreferenceControllerTest.java
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index 00000000000..6036ec73854
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+++ b/tests/unit/src/com/android/settings/network/telephony/MmsMessagePreferenceControllerTest.java
@@ -0,0 +1,119 @@
+/*
+ * 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.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+import android.telephony.SubscriptionManager;
+import android.telephony.TelephonyManager;
+import android.telephony.data.ApnSetting;
+
+import androidx.preference.SwitchPreference;
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+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 MmsMessagePreferenceControllerTest {
+    private static final int SUB_ID = 2;
+
+    @Mock
+    private TelephonyManager mTelephonyManager;
+    @Mock
+    private SubscriptionManager mSubscriptionManager;
+
+    private MmsMessagePreferenceController mController;
+    private SwitchPreference mPreference;
+    private Context mContext;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+
+        mContext = spy(ApplicationProvider.getApplicationContext());
+        when(mContext.getSystemService(TelephonyManager.class)).thenReturn(mTelephonyManager);
+        when(mContext.getSystemService(Context.TELEPHONY_SERVICE)).thenReturn(mTelephonyManager);
+        when(mContext.getSystemService(SubscriptionManager.class)).thenReturn(mSubscriptionManager);
+        when(mTelephonyManager.createForSubscriptionId(SUB_ID)).thenReturn(mTelephonyManager);
+
+        mPreference = new SwitchPreference(mContext);
+        mController = new MmsMessagePreferenceController(mContext, "mms_message");
+        mController.init(SUB_ID);
+        mPreference.setKey(mController.getPreferenceKey());
+    }
+
+    @Test
+    public void getAvailabilityStatus_invalidSubscription_returnUnavailable() {
+        mController.init(SubscriptionManager.INVALID_SUBSCRIPTION_ID);
+
+        assertThat(mController.getAvailabilityStatus()).isEqualTo(CONDITIONALLY_UNAVAILABLE);
+    }
+
+    @Test
+    public void getAvailabilityStatus_mobileDataOn_returnUnavailable() {
+        when(mTelephonyManager.isDataEnabled()).thenReturn(true);
+
+        assertThat(mController.getAvailabilityStatus(SUB_ID)).isEqualTo(CONDITIONALLY_UNAVAILABLE);
+    }
+
+    @Test
+    public void getAvailabilityStatus_meteredOff_returnUnavailable() {
+        when(mTelephonyManager.isApnMetered(ApnSetting.TYPE_MMS)).thenReturn(false);
+
+        assertThat(mController.getAvailabilityStatus(SUB_ID)).isEqualTo(CONDITIONALLY_UNAVAILABLE);
+    }
+
+    @Test
+    public void getAvailabilityStatus_mobileDataOffWithValidSubId_returnAvailable() {
+        mController.init(SUB_ID);
+        when(mTelephonyManager.isDataEnabled()).thenReturn(false);
+        when(mTelephonyManager.isApnMetered(ApnSetting.TYPE_MMS)).thenReturn(true);
+
+        assertThat(mController.getAvailabilityStatus(SUB_ID)).isEqualTo(AVAILABLE);
+    }
+
+    @Test
+    public void isChecked_returnDataFromTelephonyManager() {
+        when(mTelephonyManager.isDataEnabledForApn(ApnSetting.TYPE_MMS)).thenReturn(false);
+        assertThat(mController.isChecked()).isFalse();
+
+        when(mTelephonyManager.isDataEnabledForApn(ApnSetting.TYPE_MMS)).thenReturn(true);
+        assertThat(mController.isChecked()).isTrue();
+    }
+
+    @Test
+    public void setChecked_setDataIntoSubscriptionManager() {
+        mController.setChecked(true);
+        verify(mTelephonyManager).setAlwaysAllowMmsData(true);
+
+        mController.setChecked(false);
+        verify(mTelephonyManager).setAlwaysAllowMmsData(false);
+    }
+}