| /* |
| * Copyright (C) 2018 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.server.backup.encryption.chunking; |
| |
| import static com.google.common.truth.Truth.assertThat; |
| |
| import static org.mockito.Mockito.mock; |
| import static org.mockito.Mockito.verify; |
| import static org.testng.Assert.assertThrows; |
| |
| import android.platform.test.annotations.Presubmit; |
| |
| import org.junit.After; |
| import org.junit.Before; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.robolectric.RobolectricTestRunner; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.util.Locale; |
| |
| /** Tests for {@link SingleStreamDiffScriptWriter}. */ |
| @RunWith(RobolectricTestRunner.class) |
| @Presubmit |
| public class SingleStreamDiffScriptWriterTest { |
| private static final int MAX_CHUNK_SIZE_IN_BYTES = 256; |
| /** By default this Locale does not use Arabic numbers for %d formatting. */ |
| private static final Locale HINDI = new Locale("hi", "IN"); |
| |
| private Locale mDefaultLocale; |
| private ByteArrayOutputStream mOutputStream; |
| private SingleStreamDiffScriptWriter mDiffScriptWriter; |
| |
| @Before |
| public void setUp() { |
| mDefaultLocale = Locale.getDefault(); |
| mOutputStream = new ByteArrayOutputStream(); |
| mDiffScriptWriter = |
| new SingleStreamDiffScriptWriter(mOutputStream, MAX_CHUNK_SIZE_IN_BYTES); |
| } |
| |
| @After |
| public void tearDown() { |
| Locale.setDefault(mDefaultLocale); |
| } |
| |
| @Test |
| public void writeChunk_withNegativeStart_throwsException() { |
| assertThrows( |
| IllegalArgumentException.class, |
| () -> mDiffScriptWriter.writeChunk(-1, 50)); |
| } |
| |
| @Test |
| public void writeChunk_withZeroLength_throwsException() { |
| assertThrows( |
| IllegalArgumentException.class, |
| () -> mDiffScriptWriter.writeChunk(0, 0)); |
| } |
| |
| @Test |
| public void writeChunk_withExistingBytesInBuffer_writesBufferFirst() |
| throws IOException { |
| String testString = "abcd"; |
| writeStringAsBytesToWriter(testString, mDiffScriptWriter); |
| |
| mDiffScriptWriter.writeChunk(0, 20); |
| mDiffScriptWriter.flush(); |
| |
| // Expected format: length of abcd, newline, abcd, newline, chunk start - chunk end |
| assertThat(mOutputStream.toString("UTF-8")).isEqualTo( |
| String.format("%d\n%s\n%d-%d\n", testString.length(), testString, 0, 19)); |
| } |
| |
| @Test |
| public void writeChunk_overlappingPreviousChunk_combinesChunks() throws IOException { |
| mDiffScriptWriter.writeChunk(3, 4); |
| |
| mDiffScriptWriter.writeChunk(7, 5); |
| mDiffScriptWriter.flush(); |
| |
| assertThat(mOutputStream.toString("UTF-8")).isEqualTo(String.format("3-11\n")); |
| } |
| |
| @Test |
| public void writeChunk_formatsByteIndexesUsingArabicNumbers() throws Exception { |
| Locale.setDefault(HINDI); |
| |
| mDiffScriptWriter.writeChunk(0, 12345); |
| mDiffScriptWriter.flush(); |
| |
| assertThat(mOutputStream.toString("UTF-8")).isEqualTo("0-12344\n"); |
| } |
| |
| @Test |
| public void flush_flushesOutputStream() throws IOException { |
| ByteArrayOutputStream mockOutputStream = mock(ByteArrayOutputStream.class); |
| SingleStreamDiffScriptWriter diffScriptWriter = |
| new SingleStreamDiffScriptWriter(mockOutputStream, MAX_CHUNK_SIZE_IN_BYTES); |
| |
| diffScriptWriter.flush(); |
| |
| verify(mockOutputStream).flush(); |
| } |
| |
| private void writeStringAsBytesToWriter(String string, SingleStreamDiffScriptWriter writer) |
| throws IOException { |
| byte[] bytes = string.getBytes("UTF-8"); |
| for (int i = 0; i < bytes.length; i++) { |
| writer.writeByte(bytes[i]); |
| } |
| } |
| } |