diff --git a/tests/unit/src/com/android/settings/network/MultiNetworkHeaderControllerTest.java b/tests/unit/src/com/android/settings/network/MultiNetworkHeaderControllerTest.java
new file mode 100644
index 00000000000..cdb82a66b7b
--- /dev/null
+++ b/tests/unit/src/com/android/settings/network/MultiNetworkHeaderControllerTest.java
@@ -0,0 +1,174 @@
+/*
+ * 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;
+
+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.os.Looper;
+import android.telephony.SubscriptionManager;
+
+import androidx.preference.PreferenceCategory;
+import androidx.preference.PreferenceManager;
+import androidx.preference.PreferenceScreen;
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import com.android.settings.wifi.WifiConnectionPreferenceController;
+import com.android.settingslib.core.lifecycle.Lifecycle;
+
+import org.junit.Assert;
+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 MultiNetworkHeaderControllerTest {
+    private static final String KEY_HEADER = "multi_network_header";
+    private static final int EXPANDED_CHILDREN_COUNT = 5;
+
+    @Mock
+    private PreferenceCategory mPreferenceCategory;
+    @Mock
+    private WifiConnectionPreferenceController mWifiController;
+    @Mock
+    private SubscriptionsPreferenceController mSubscriptionsController;
+    @Mock
+    private SubscriptionManager mSubscriptionManager;
+    @Mock
+    private Lifecycle mLifecycle;
+
+    private Context mContext;
+    private PreferenceManager mPreferenceManager;
+    private PreferenceScreen mPreferenceScreen;
+    private MultiNetworkHeaderController mHeaderController;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mContext = spy(ApplicationProvider.getApplicationContext());
+        when(mContext.getSystemService(SubscriptionManager.class)).thenReturn(mSubscriptionManager);
+
+        mHeaderController = new MultiNetworkHeaderController(mContext, KEY_HEADER) {
+            @Override
+            WifiConnectionPreferenceController createWifiController(Lifecycle lifecycle) {
+                return mWifiController;
+            }
+
+            @Override
+            SubscriptionsPreferenceController createSubscriptionsController(Lifecycle lifecycle) {
+                return mSubscriptionsController;
+            }
+        };
+
+        if (Looper.myLooper() == null) {
+            Looper.prepare();
+        }
+        mPreferenceManager = new PreferenceManager(mContext);
+        mPreferenceScreen = mPreferenceManager.createPreferenceScreen(mContext);
+        mPreferenceScreen.setInitialExpandedChildrenCount(EXPANDED_CHILDREN_COUNT);
+        when(mPreferenceCategory.getKey()).thenReturn(KEY_HEADER);
+        when(mPreferenceCategory.getPreferenceCount()).thenReturn(3);
+        mPreferenceScreen.addPreference(mPreferenceCategory);
+    }
+
+    @Test
+    public void isAvailable_beforeInitIsCalled_notAvailable() {
+        assertThat(mHeaderController.isAvailable()).isFalse();
+    }
+
+    // When calling displayPreference, the header itself should only be visible if the
+    // subscriptions controller says it is available. This is a helper for test cases of this logic.
+    private void displayPreferenceTest(boolean wifiAvailable, boolean subscriptionsAvailable,
+            boolean setVisibleExpectedValue) {
+        when(mWifiController.isAvailable()).thenReturn(wifiAvailable);
+        when(mSubscriptionsController.isAvailable()).thenReturn(subscriptionsAvailable);
+
+        mHeaderController.init(mLifecycle);
+        mHeaderController.displayPreference(mPreferenceScreen);
+        Assert.assertEquals(mPreferenceCategory.isVisible(), setVisibleExpectedValue);
+    }
+
+    @Test
+    public void displayPreference_bothNotAvailable_categoryIsNotVisible() {
+        displayPreferenceTest(false, false, false);
+    }
+
+    @Test
+    public void displayPreference_wifiAvailableButNotSubscriptions_categoryIsNotVisible() {
+        displayPreferenceTest(true, false, false);
+    }
+
+    @Test
+    public void displayPreference_subscriptionsAvailableButNotWifi_categoryIsVisible() {
+        displayPreferenceTest(false, true, true);
+    }
+
+    @Test
+    public void displayPreference_bothAvailable_categoryIsVisible() {
+        displayPreferenceTest(true, true, true);
+    }
+
+    @Test
+    public void onChildUpdated_subscriptionsBecameAvailable_categoryIsVisible() {
+        when(mSubscriptionsController.isAvailable()).thenReturn(false);
+        mHeaderController.init(mLifecycle);
+        mHeaderController.displayPreference(mPreferenceScreen);
+
+        when(mSubscriptionsController.isAvailable()).thenReturn(true);
+        mHeaderController.onChildrenUpdated();
+
+        Assert.assertTrue(mPreferenceCategory.isVisible());
+        assertThat(mPreferenceScreen.getInitialExpandedChildrenCount()).isEqualTo(
+                EXPANDED_CHILDREN_COUNT + mPreferenceCategory.getPreferenceCount());
+    }
+
+    @Test
+    public void onChildUpdated_subscriptionsBecameUnavailable_categoryIsNotVisible() {
+        when(mSubscriptionsController.isAvailable()).thenReturn(true);
+        mHeaderController.init(mLifecycle);
+        mHeaderController.displayPreference(mPreferenceScreen);
+
+        when(mSubscriptionsController.isAvailable()).thenReturn(false);
+        mHeaderController.onChildrenUpdated();
+
+        Assert.assertFalse(mPreferenceCategory.isVisible());
+        assertThat(mPreferenceScreen.getInitialExpandedChildrenCount()).isEqualTo(
+                EXPANDED_CHILDREN_COUNT);
+    }
+
+    @Test
+    public void onChildUpdated_noExpandedChildCountAndAvailable_doesNotSetExpandedCount() {
+        mPreferenceScreen.setInitialExpandedChildrenCount(Integer.MAX_VALUE);
+
+        when(mSubscriptionsController.isAvailable()).thenReturn(false);
+        mHeaderController.init(mLifecycle);
+        mHeaderController.displayPreference(mPreferenceScreen);
+
+        when(mSubscriptionsController.isAvailable()).thenReturn(true);
+        mHeaderController.onChildrenUpdated();
+
+        // Check that setInitialExpandedChildrenCount was never called.
+        Assert.assertEquals(mPreferenceScreen.getInitialExpandedChildrenCount(), Integer.MAX_VALUE);
+    }
+}