Adding API stubs for application network routing

Bug: 171795464
Test: atest FrameworksNetTests
Change-Id: Ib055aa37a7bf0c48c335307afc2258aa869c4267

tests/net/common/java/android/net/OemNetworkPreferencesTest.java

@@ -0,0 +1,104 @@
+/*
+ * 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 android.net;
+
+import static com.android.testutils.MiscAsserts.assertThrows;
+import static com.android.testutils.ParcelUtils.assertParcelSane;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import android.util.SparseArray;
+
+import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@RunWith(AndroidJUnit4.class)
+@SmallTest
+public class OemNetworkPreferencesTest {
+
+    private static final int TEST_PREF = OemNetworkPreferences.OEM_NETWORK_PREFERENCE_DEFAULT;
+    private static final String TEST_PACKAGE = "com.google.apps.contacts";
+
+    private final List<String> mPackages = new ArrayList<>();
+    private final OemNetworkPreferences.Builder mBuilder = new OemNetworkPreferences.Builder();
+
+    @Before
+    public void beforeEachTestMethod() {
+        mPackages.add(TEST_PACKAGE);
+    }
+
+    @Test
+    public void builderAddNetworkPreferenceRequiresNonNullPackages() {
+        assertThrows(NullPointerException.class,
+                () -> mBuilder.addNetworkPreference(TEST_PREF, null));
+    }
+
+    @Test
+    public void getNetworkPreferencesReturnsCorrectValue() {
+        final int expectedNumberOfMappings = 1;
+        mBuilder.addNetworkPreference(TEST_PREF, mPackages);
+
+        final SparseArray<List<String>> networkPreferences =
+                mBuilder.build().getNetworkPreferences();
+
+        assertEquals(expectedNumberOfMappings, networkPreferences.size());
+        assertEquals(mPackages.size(), networkPreferences.get(TEST_PREF).size());
+        assertEquals(mPackages.get(0), networkPreferences.get(TEST_PREF).get(0));
+    }
+
+    @Test
+    public void getNetworkPreferencesReturnsUnmodifiableValue() {
+        final String newPackage = "new.com.google.apps.contacts";
+        mBuilder.addNetworkPreference(TEST_PREF, mPackages);
+
+        final SparseArray<List<String>> networkPreferences =
+                mBuilder.build().getNetworkPreferences();
+
+        assertThrows(UnsupportedOperationException.class,
+                () -> networkPreferences.get(TEST_PREF).set(mPackages.size() - 1, newPackage));
+
+        assertThrows(UnsupportedOperationException.class,
+                () -> networkPreferences.get(TEST_PREF).add(newPackage));
+    }
+
+    @Test
+    public void toStringReturnsCorrectValue() {
+        mBuilder.addNetworkPreference(TEST_PREF, mPackages);
+
+        final String networkPreferencesString = mBuilder.build().getNetworkPreferences().toString();
+
+        assertTrue(networkPreferencesString.contains(Integer.toString(TEST_PREF)));
+        assertTrue(networkPreferencesString.contains(TEST_PACKAGE));
+    }
+
+    @Test
+    public void testOemNetworkPreferencesParcelable() {
+        mBuilder.addNetworkPreference(TEST_PREF, mPackages);
+
+        final OemNetworkPreferences prefs = mBuilder.build();
+
+        assertParcelSane(prefs, 1 /* fieldCount */);
+    }
+}