diff --git a/tests/unit/src/com/android/settings/datausage/CellDataPreferenceTest.java b/tests/unit/src/com/android/settings/datausage/CellDataPreferenceTest.java
new file mode 100644
index 00000000000..93ca87577cf
--- /dev/null
+++ b/tests/unit/src/com/android/settings/datausage/CellDataPreferenceTest.java
@@ -0,0 +1,77 @@
+/*
+ * 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.datausage;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.Context;
+import android.telephony.SubscriptionInfo;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.LinearLayout;
+
+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 CellDataPreferenceTest {
+
+    @Mock
+    private SubscriptionInfo mSubInfo;
+
+    private Context mContext;
+    private CellDataPreference mPreference;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+
+        mContext = ApplicationProvider.getApplicationContext();
+        mPreference = new CellDataPreference(mContext, null) {
+            @Override
+            SubscriptionInfo getActiveSubscriptionInfo(int subId) {
+                return mSubInfo;
+            }
+        };
+
+        final LayoutInflater inflater = LayoutInflater.from(mContext);
+        final View view = inflater.inflate(mPreference.getLayoutResource(),
+                new LinearLayout(mContext), false);
+    }
+
+    @Test
+    public void updateEnabled_noActiveSub_shouldDisable() {
+        mSubInfo = null;
+
+        mPreference.mOnSubscriptionsChangeListener.onChanged();
+
+        assertThat(mPreference.isEnabled()).isFalse();
+    }
+
+    @Test
+    public void updateEnabled_hasActiveSub_shouldEnable() {
+        mPreference.mOnSubscriptionsChangeListener.onChanged();
+
+        assertThat(mPreference.isEnabled()).isTrue();
+    }
+}