Restrict WiFi network connection

- Use StandardWifiEntry#canConnect() to determine if the network should
  be disabled or not.

- Use StandardWifiEntry#getSummary() to retrieve the restriction message.

- Disabled WiFi network if it cannot connect.

- If WiFi network is connected or saved network, leave it enabled to
disconnect or configure.

- See the result screenshot in b/203168943#comment11

Bug: 203168938
Bug: 203168943
Test: manual test
make RunSettingsRoboTests ROBOTEST_FILTER=LongPressWifiEntryPreferenceTest
make RunSettingsRoboTests ROBOTEST_FILTER=NetworkProviderSettingsTest

Change-Id: I04aafaa5b383598a0f87eea15d06b38bbc662b9e

tests/robotests/src/com/android/settings/wifi/LongPressWifiEntryPreferenceTest.java

@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2022 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.when;
+
+import android.content.Context;
+
+import androidx.fragment.app.Fragment;
+import androidx.test.core.app.ApplicationProvider;
+
+import com.android.wifitrackerlib.WifiEntry;
+
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.Spy;
+import org.mockito.junit.MockitoJUnit;
+import org.mockito.junit.MockitoRule;
+import org.robolectric.RobolectricTestRunner;
+
+@RunWith(RobolectricTestRunner.class)
+public class LongPressWifiEntryPreferenceTest {
+
+    @Rule
+    public final MockitoRule mMockitoRule = MockitoJUnit.rule();
+    @Spy
+    Context mContext = ApplicationProvider.getApplicationContext();
+    @Mock
+    Fragment mFragment;
+    @Mock
+    WifiEntry mWifiEntry;
+
+    LongPressWifiEntryPreference mPreference;
+
+    @Before
+    public void setUp() {
+        // Fake mWifiEntry as an available Wi-Fi network, and it's not connected.
+        when(mWifiEntry.canConnect()).thenReturn(true);
+        when(mWifiEntry.canDisconnect()).thenReturn(false);
+        when(mWifiEntry.isSaved()).thenReturn(false);
+
+        mPreference = new LongPressWifiEntryPreference(mContext, mWifiEntry, mFragment);
+    }
+
+    @Test
+    public void shouldEnabled_canConnect_returnTrue() {
+        // Fake mWifiEntry as an available Wi-Fi network, and it's not connected.
+        when(mWifiEntry.canConnect()).thenReturn(true);
+
+        assertThat(mPreference.shouldEnabled()).isTrue();
+    }
+
+    @Test
+    public void shouldEnabled_canNotConnect_returnFalse() {
+        // Fake mWifiEntry as a restricted Wi-Fi network, and cannot connect.
+        when(mWifiEntry.canConnect()).thenReturn(false);
+
+        assertThat(mPreference.shouldEnabled()).isFalse();
+    }
+
+    @Test
+    public void shouldEnabled_canNotConnectButCanDisconnect_returnTrue() {
+        // Fake mWifiEntry as a connected Wi-Fi network without saved configuration.
+        when(mWifiEntry.canConnect()).thenReturn(false);
+        when(mWifiEntry.canDisconnect()).thenReturn(true);
+
+        assertThat(mPreference.shouldEnabled()).isTrue();
+    }
+
+    @Test
+    public void shouldEnabled_canNotConnectButIsSaved_returnTrue() {
+        // Fake mWifiEntry as a saved Wi-Fi network
+        when(mWifiEntry.canConnect()).thenReturn(false);
+        when(mWifiEntry.isSaved()).thenReturn(true);
+
+        assertThat(mPreference.shouldEnabled()).isTrue();
+    }
+
+    @Test
+    public void shouldEnabled_canNotConnectButCanDisconnectAndIsSaved_returnTrue() {
+        // Fake mWifiEntry as a connected Wi-Fi network
+        when(mWifiEntry.canConnect()).thenReturn(false);
+        when(mWifiEntry.canDisconnect()).thenReturn(true);
+        when(mWifiEntry.isSaved()).thenReturn(true);
+
+        assertThat(mPreference.shouldEnabled()).isTrue();
+    }
+}