Add ApnSettingsTest

Adding this test to cover the regression in b/24002396 so that we no
longer have to rely on a manual test. The tests under
MmsServiceRoboTests still need to be added to a presubmit.

Test: atest ApnSettingsTest

Change-Id: Ic112a3edf750597bc5f23790d7258175988d871e
Bug: 143818216
diff --git a/tests/robotests/Android.bp b/tests/robotests/Android.bp
index e983542..54b361b 100644
--- a/tests/robotests/Android.bp
+++ b/tests/robotests/Android.bp
@@ -9,10 +9,10 @@
 
     java_resource_dirs: ["config"],
 
-    static_libs: ["testng"],
+    static_libs: [
+        "androidx.test.core",
+        "testng",
+    ],
 
     instrumentation_for: "MmsService",
-}
-
-
-
+}
\ No newline at end of file
diff --git a/tests/robotests/src/com/android/mms/service/ApnSettingsTest.java b/tests/robotests/src/com/android/mms/service/ApnSettingsTest.java
new file mode 100644
index 0000000..6428b1e
--- /dev/null
+++ b/tests/robotests/src/com/android/mms/service/ApnSettingsTest.java
@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2019 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.mms.service;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.testng.Assert.assertThrows;
+
+import android.content.ContentProvider;
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.Cursor;
+import android.net.Uri;
+import android.provider.Telephony;
+
+import androidx.test.core.app.ApplicationProvider;
+
+import com.android.internal.telephony.PhoneConstants;
+import com.android.mms.service.exception.ApnException;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.fakes.RoboCursor;
+import org.robolectric.shadows.ShadowContentResolver;
+
+import java.util.Arrays;
+
+@RunWith(RobolectricTestRunner.class)
+public final class ApnSettingsTest {
+
+    private Context context;
+
+    @Before
+    public void setUp() {
+        context = ApplicationProvider.getApplicationContext();
+    }
+
+    @Test
+    public void load_noApnSettings_throwsApnException() {
+        assertThrows(ApnException.class,
+                () -> ApnSettings.load(context, "apnName", /* subId= */ 0, "requestId"));
+    }
+
+    @Test
+    public void getApnSettingsFromCursor_validSettings_correctApnSettingsLoaded() throws Exception {
+        createApnSettingsCursor("mmscUrl", "mmsProxy", /* proxyPort= */ "123");
+        ApnSettings apnSettings = ApnSettings.load(context, "apnName", /* subId= */ 0, "requestId");
+
+        assertThat(apnSettings.getProxyPort()).isEqualTo(123);
+        assertThat(apnSettings.getMmscUrl()).isEqualTo("mmscUrl");
+        assertThat(apnSettings.getProxyAddress()).isEqualTo("mmsProxy");
+    }
+
+    @Test
+    public void getApnSettingsFromCursor_nullMmsPort_defaultProxyPortUsed() throws Exception {
+        createApnSettingsCursor("mmscUrl", "mmsProxy", /* proxyPort= */ null);
+        ApnSettings apnSettings = ApnSettings.load(context, "apnName", /* subId= */ 0, "requestId");
+        assertThat(apnSettings.getProxyPort()).isEqualTo(80);
+    }
+
+    @Test
+    public void getApnSettingsFromCursor_emptyMmsPort_defaultProxyPortUsed() throws Exception {
+        createApnSettingsCursor("mmscUrl", "mmsProxy",
+                /* proxyPort= */ "");
+        ApnSettings apnSettings = ApnSettings.load(context, "apnName", /* subId= */ 0, "requestId");
+        assertThat(apnSettings.getProxyPort()).isEqualTo(80);
+    }
+
+    private void createApnSettingsCursor(String mmscUrl, String mmsProxy, String proxyPort) {
+        Object[][] apnValues =
+                {new Object[]{PhoneConstants.APN_TYPE_MMS, mmscUrl, mmsProxy, proxyPort}};
+        RoboCursor cursor = new RoboCursor();
+        cursor.setResults(apnValues);
+        cursor.setColumnNames(Arrays.asList(Telephony.Carriers.TYPE, Telephony.Carriers.MMSC,
+                Telephony.Carriers.MMSPROXY, Telephony.Carriers.MMSPORT));
+
+        ShadowContentResolver.registerProviderInternal(
+                Telephony.Carriers.CONTENT_URI.getAuthority(), new FakeApnSettingsProvider(cursor));
+    }
+
+    private final class FakeApnSettingsProvider extends ContentProvider {
+
+        private final Cursor cursor;
+
+        FakeApnSettingsProvider(Cursor cursor) {
+            this.cursor = cursor;
+        }
+
+        @Override
+        public boolean onCreate() {
+            return false;
+        }
+
+        @Override
+        public Cursor query(Uri uri, String[] projection,
+                String selection, String[] selectionArgs, String sortOrder) {
+            return cursor;
+        }
+
+        @Override
+        public String getType(Uri uri) {
+            return null;
+        }
+
+        @Override
+        public Uri insert(Uri uri, ContentValues values) {
+            return null;
+        }
+
+        @Override
+        public int delete(Uri uri, String selection, String[] selectionArgs) {
+            return 0;
+        }
+
+        @Override
+        public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
+            return 0;
+        }
+    }
+
+}