Creating contents state byte array before opening stream

chrome/android/junit/src/org/chromium/chrome/browser/tabstate/TabStateUnitTest.java

Index: chrome/android/junit/src/org/chromium/chrome/browser/tabstate/TabStateUnitTest.java
diff --git a/chrome/android/junit/src/org/chromium/chrome/browser/tabstate/TabStateUnitTest.java b/chrome/android/junit/src/org/chromium/chrome/browser/tabstate/TabStateUnitTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..062fa289540adee78549dab17f86716a92a9b85c
--- /dev/null
+++ b/chrome/android/junit/src/org/chromium/chrome/browser/tabstate/TabStateUnitTest.java
@@ -0,0 +1,107 @@
+// Copyright 2016 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.chrome.browser.tabstate;
+
+import static org.junit.Assert.assertEquals;
+
+import org.chromium.base.StreamUtil;
+import org.chromium.chrome.browser.TabState;
+import org.chromium.testing.local.LocalRobolectricTestRunner;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+import org.junit.runner.RunWith;
+import org.robolectric.annotation.Config;
+
+import java.io.DataOutputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.nio.channels.FileChannel;
+
+/**
+ * Unit tests for TabState.
+ */
+@RunWith(LocalRobolectricTestRunner.class)
+@Config(manifest = Config.NONE)
+public class TabStateUnitTest {
+
+    private static final byte[] CONTENTS_STATE_BYTES = new byte[] {1, 2, 3};
+    private static final long TIMESTAMP = 10L;
+    private static final long SYNC_ID = 3;
+    private static final int PARENT_ID = 1;
+    private static final int VERSION = 2;
+    private static final int THEME_COLOR = 4;
+    private static final boolean SHOULD_PRESERVE = true;
+    private static final String OPENER_APP_ID = "test";
+
+    @Rule
+    public TemporaryFolder temporaryFolder = new TemporaryFolder();
+
+    @Test
+    public void testSaveTabStateWithMemoryMappedContentsState() throws IOException {
+        File file = createTestTabStateFile();
+        TabState state = createTabStateWithMappedByteBuffer(file);
+        TabState.saveState(file, state, false);
+
+        validateTestTabState(TabState.restoreTabState(file, false));
+    }
+
+    private TabState createTabStateWithMappedByteBuffer(File file) throws IOException {
+        TabState state = new TabState();
+        FileInputStream fileInputStream = null;
+
+        try {
+            fileInputStream = new FileInputStream(file);
+            state.contentsState = new TabState.WebContentsState(fileInputStream.getChannel().map(
+                    FileChannel.MapMode.READ_ONLY, fileInputStream.getChannel().position(),

[gone, 2016/07/13 17:03:08]

nit: indentation is slightly off here

+                     file.length()));
+            state.contentsState.setVersion(VERSION);
+            state.timestampMillis = TIMESTAMP;
+            state.parentId = PARENT_ID;
+            state.syncId = SYNC_ID;
+            state.themeColor = THEME_COLOR;
+            state.shouldPreserve = SHOULD_PRESERVE;
+            state.openerAppId = OPENER_APP_ID;
+        } finally {
+            StreamUtil.closeQuietly(fileInputStream);
+        }
+        return state;
+    }
+
+    private void validateTestTabState(TabState state) {
+        assertEquals(TIMESTAMP, state.timestampMillis);
+        assertEquals(PARENT_ID, state.parentId);
+        assertEquals(OPENER_APP_ID, state.openerAppId);
+        assertEquals(VERSION, state.contentsState.version());
+        assertEquals(SYNC_ID, state.syncId);
+        assertEquals(SHOULD_PRESERVE, state.shouldPreserve);
+        assertEquals(THEME_COLOR, state.getThemeColor());
+        assertEquals(CONTENTS_STATE_BYTES.length, state.contentsState.buffer().remaining());
+
+        byte[] bytesFromFile = new byte[CONTENTS_STATE_BYTES.length];
+        state.contentsState.buffer().get(bytesFromFile);
+
+        for (int i = 0; i < CONTENTS_STATE_BYTES.length; i++) {
+            assertEquals(bytesFromFile[i], CONTENTS_STATE_BYTES[i]);
+        }
+    }
+
+    private File createTestTabStateFile() throws IOException {
+        File file = temporaryFolder.newFile("tabStateByteBufferTestFile");
+        FileOutputStream fileOutputStream = null;
+        DataOutputStream dataOutputStream = null;
+        try {
+            fileOutputStream = new FileOutputStream(file);
+            dataOutputStream = new DataOutputStream(fileOutputStream);
+            dataOutputStream.write(CONTENTS_STATE_BYTES);
+        } finally {
+            StreamUtil.closeQuietly(fileOutputStream);
+            StreamUtil.closeQuietly(dataOutputStream);
+        }
+        return file;
+    }
+}