[Provider Model] Implement the carrner network selection settings

- Add WifiPickerTrackerHelper to reuse the library

- User taps on carrier network preference
  - Calls MergedCarrierEntry#connect()

- User toggles mobile data On/Off
  - Calls MergedCarrierEntry#setEnabled(true/false)

Bug: 175761096
Test:
- Manual Test
- atest NetworkMobileProviderControllerTest \
        SubscriptionsPreferenceControllerTest \
        WifiPickerTrackerHelperTest

Change-Id: Ia311b10ca7a44a536556c1889ee65743af379822

tests/unit/src/com/android/settings/wifi/WifiPickerTrackerHelperTest.java

@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) 2021 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.wifi;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.os.HandlerThread;
+
+import androidx.lifecycle.Lifecycle;
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import com.android.wifitrackerlib.MergedCarrierEntry;
+import com.android.wifitrackerlib.WifiEntry;
+import com.android.wifitrackerlib.WifiPickerTracker;
+
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnit;
+import org.mockito.junit.MockitoRule;
+
+@RunWith(AndroidJUnit4.class)
+public class WifiPickerTrackerHelperTest {
+
+    @Rule
+    public final MockitoRule mMockitoRule = MockitoJUnit.rule();
+    @Mock
+    public WifiPickerTracker mWifiPickerTracker;
+    @Mock
+    public MergedCarrierEntry mMergedCarrierEntry;
+    @Mock
+    public WifiEntry.ConnectCallback mConnectCallback;
+
+    private WifiPickerTrackerHelper mWifiPickerTrackerHelper;
+
+    @Before
+    public void setUp() {
+        mWifiPickerTrackerHelper = new WifiPickerTrackerHelper(mock(Lifecycle.class),
+                ApplicationProvider.getApplicationContext(), null);
+    }
+
+    @Test
+    public void getWifiPickerTracker_returnNonNull() {
+        assertThat(mWifiPickerTrackerHelper.getWifiPickerTracker()).isNotNull();
+    }
+
+    @Test
+    public void onDestroy_workerThreadQuit() {
+        final HandlerThread workerThread = mock(HandlerThread.class);
+        mWifiPickerTrackerHelper.setWorkerThread(workerThread);
+
+        mWifiPickerTrackerHelper.onDestroy();
+
+        verify(workerThread).quit();
+    }
+
+    @Test
+    public void setCarrierNetworkEnabled_returnTrueAndSetEnabled() {
+        mWifiPickerTrackerHelper.setWifiPickerTracker(mWifiPickerTracker);
+        when(mWifiPickerTracker.getMergedCarrierEntry()).thenReturn(mMergedCarrierEntry);
+
+        assertThat(mWifiPickerTrackerHelper.setCarrierNetworkEnabled(true)).isTrue();
+        verify(mMergedCarrierEntry).setEnabled(true);
+
+        assertThat(mWifiPickerTrackerHelper.setCarrierNetworkEnabled(false)).isTrue();
+        verify(mMergedCarrierEntry).setEnabled(false);
+    }
+
+    @Test
+    public void setCarrierNetworkEnabled_mergedCarrierEntryIsNull_returnFalse() {
+        mWifiPickerTrackerHelper.setWifiPickerTracker(mWifiPickerTracker);
+        when(mWifiPickerTracker.getMergedCarrierEntry()).thenReturn(null);
+
+        assertThat(mWifiPickerTrackerHelper.setCarrierNetworkEnabled(true)).isFalse();
+        assertThat(mWifiPickerTrackerHelper.setCarrierNetworkEnabled(false)).isFalse();
+    }
+
+    @Test
+    public void connectCarrierNetwork_returnTrueAndConnect() {
+        mWifiPickerTrackerHelper.setWifiPickerTracker(mWifiPickerTracker);
+        when(mWifiPickerTracker.getMergedCarrierEntry()).thenReturn(mMergedCarrierEntry);
+        when(mMergedCarrierEntry.canConnect()).thenReturn(true);
+
+        assertThat(mWifiPickerTrackerHelper.connectCarrierNetwork(mConnectCallback)).isTrue();
+        verify(mMergedCarrierEntry).connect(mConnectCallback);
+    }
+
+    @Test
+    public void connectCarrierNetwork_mergedCarrierEntryIsNull_returnFalse() {
+        mWifiPickerTrackerHelper.setWifiPickerTracker(mWifiPickerTracker);
+        when(mWifiPickerTracker.getMergedCarrierEntry()).thenReturn(null);
+
+        assertThat(mWifiPickerTrackerHelper.connectCarrierNetwork(mConnectCallback)).isFalse();
+    }
+
+    @Test
+    public void connectCarrierNetwork_canConnectIsFalse_returnFalseAndNeverConnect() {
+        mWifiPickerTrackerHelper.setWifiPickerTracker(mWifiPickerTracker);
+        when(mWifiPickerTracker.getMergedCarrierEntry()).thenReturn(mMergedCarrierEntry);
+        when(mMergedCarrierEntry.canConnect()).thenReturn(false);
+
+        assertThat(mWifiPickerTrackerHelper.connectCarrierNetwork(mConnectCallback)).isFalse();
+        verify(mMergedCarrierEntry, never()).connect(mConnectCallback);
+    }
+}