diff --git a/tests/unit/src/com/android/settings/network/telephony/TelephonyBasePreferenceControllerTest.java b/tests/unit/src/com/android/settings/network/telephony/TelephonyBasePreferenceControllerTest.java
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+++ b/tests/unit/src/com/android/settings/network/telephony/TelephonyBasePreferenceControllerTest.java
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+/*
+ * 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.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+import android.telephony.SubscriptionInfo;
+import android.telephony.SubscriptionManager;
+
+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;
+
+import java.util.Arrays;
+
+@RunWith(AndroidJUnit4.class)
+public class TelephonyBasePreferenceControllerTest {
+    private static final int VALID_SUB_ID = 1;
+
+    @Mock
+    private SubscriptionManager mSubscriptionManager;
+    @Mock
+    private SubscriptionInfo mSubscriptionInfo;
+
+    private TestPreferenceController mPreferenceController;
+    private Context mContext;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+
+        mContext = spy(ApplicationProvider.getApplicationContext());
+        when(mContext.getSystemService(SubscriptionManager.class))
+                .thenReturn(mSubscriptionManager);
+        when(mSubscriptionInfo.getSubscriptionId()).thenReturn(VALID_SUB_ID);
+        mPreferenceController = new TestPreferenceController(mContext, "prefKey");
+    }
+
+    @Test
+    public void isAvailable_validSubIdSet_returnTrue() {
+        mPreferenceController.init(VALID_SUB_ID);
+
+        assertThat(mPreferenceController.isAvailable()).isTrue();
+    }
+
+    @Test
+    public void isAvailable_noIdSetHoweverHasDefaultOne_returnTrue() {
+        when(mSubscriptionManager.getActiveSubscriptionInfoList()).thenReturn(
+                Arrays.asList(mSubscriptionInfo));
+
+        assertThat(mPreferenceController.isAvailable()).isTrue();
+    }
+
+    @Test
+    public void isAvailable_noDefaultAndNoSet_returnFalse() {
+        assertThat(mPreferenceController.isAvailable()).isFalse();
+    }
+
+    /**
+     * Test preference controller for {@link TelephonyBasePreferenceController}
+     */
+    public class TestPreferenceController extends TelephonyBasePreferenceController {
+        public TestPreferenceController(Context context, String prefKey) {
+            super(context, prefKey);
+        }
+
+        public void init(int subId) {
+            mSubId = subId;
+        }
+
+        @Override
+        public int getAvailabilityStatus(int subId) {
+            return subId == VALID_SUB_ID ? AVAILABLE : UNSUPPORTED_ON_DEVICE;
+        }
+    }
+}