Add AwVariationsSeedFetchService and refactory VariationsSeedFetcher

android_webview/javatests/src/org/chromium/android_webview/test/AwVariationsSeedFetchServiceTest.java

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.android_webview.test;
+
+import android.annotation.TargetApi;
+import android.os.Build;
+import android.support.test.filters.MediumTest;
+import android.test.InstrumentationTestCase;
+
+import org.chromium.android_webview.AwVariationsSeedFetchService;
+import org.chromium.android_webview.AwVariationsSeedFetchService.SeedPreference;
+import org.chromium.base.ContextUtils;
+import org.chromium.base.test.util.MinAndroidSdkLevel;
+import org.chromium.components.variations.firstrun.VariationsSeedFetcher.SeedInfo;
+
+import java.io.IOException;
+import java.util.Arrays;
+
+/**
+ * Instrumentation tests for AwVariationsSeedFetchService.
+ */
+@MinAndroidSdkLevel(Build.VERSION_CODES.LOLLIPOP) // Android versions under L don't have JobService.
+@TargetApi(Build.VERSION_CODES.LOLLIPOP) // JobService requires API level 21.
+public class AwVariationsSeedFetchServiceTest extends InstrumentationTestCase {
+    protected void setUp() throws Exception {
+        ContextUtils.initApplicationContextForTests(
+                getInstrumentation().getTargetContext().getApplicationContext());
+    }
+
+    protected void tearDown() throws Exception {
+        AwVariationsSeedFetchService.clearDataForTesting();
+    }
+
+    /**
+     * Ensure reading and writing seed data and pref works correctly.
+     */
+    @MediumTest
+    public void testReadAndWriteVariationsSeed() throws IOException, ClassNotFoundException {
+        SeedInfo seedInfo = new SeedInfo();
+        seedInfo.seedData = "SeedData".getBytes();
+        seedInfo.signature = "SeedSignature";
+        seedInfo.country = "SeedCountry";
+        seedInfo.date = "SeedDate";
+        seedInfo.isGzipCompressed = true;
+        AwVariationsSeedFetchService.storeVariationsSeed(seedInfo);
+
+        byte[] seedData = AwVariationsSeedFetchService.getVariationsSeedData();
+        assertTrue(Arrays.equals(seedData, seedInfo.seedData));
+
+        SeedPreference seedPreference = AwVariationsSeedFetchService.getVariationsSeedPreference();
+        assertEquals(seedPreference.signature, seedInfo.signature);
+        assertEquals(seedPreference.country, seedInfo.country);
+        assertEquals(seedPreference.date, seedInfo.date);
+        assertEquals(seedPreference.isGzipCompressed, seedInfo.isGzipCompressed);
+    }
+}