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// Copyright 2021 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.google.android.downloader;
import static com.google.common.truth.Truth.assertThat;
import static java.nio.charset.StandardCharsets.UTF_8;
import static org.junit.Assert.assertThrows;
import com.google.common.io.CharSource;
import com.google.common.io.Files;
import java.io.File;
import java.io.FileNotFoundException;
import java.nio.channels.Channels;
import java.nio.channels.WritableByteChannel;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/** Unit tests for ProtoFileDownloadDestination. */
@RunWith(JUnit4.class)
public final class ProtoFileDownloadDestinationTest {
@Rule public TemporaryFolder temporaryFolder = new TemporaryFolder();
@Test
public void numExistingBytes_fileDoesNotExist() throws Exception {
File targetFile = new File("/does/not/exist");
File metadataFile = new File(targetFile.getParent(), targetFile.getName() + ".meta");
ProtoFileDownloadDestination downloadDestination =
new ProtoFileDownloadDestination(targetFile, metadataFile);
// Perhaps a bit surprising, but java.io.File.length returns 0 for a file that does not exist
assertThat(downloadDestination.numExistingBytes()).isEqualTo(0);
}
@Test
public void numExistingBytes_fileEmpty() throws Exception {
File targetFile = temporaryFolder.newFile();
File metadataFile = new File(targetFile.getParent(), targetFile.getName() + ".meta");
ProtoFileDownloadDestination downloadDestination =
new ProtoFileDownloadDestination(targetFile, metadataFile);
assertThat(downloadDestination.numExistingBytes()).isEqualTo(0);
}
@Test
public void numExistingBytes_fileNonEmpty() throws Exception {
File targetFile = temporaryFolder.newFile();
File metadataFile = new File(targetFile.getParent(), targetFile.getName() + ".meta");
ProtoFileDownloadDestination downloadDestination =
new ProtoFileDownloadDestination(targetFile, metadataFile);
Files.asCharSink(targetFile, UTF_8).write("Hello world");
assertThat(downloadDestination.numExistingBytes()).isEqualTo(targetFile.length());
}
@Test
public void metadata_fileDoesNotExist() throws Exception {
File targetFile = new File("/does/not/exist");
File metadataFile = new File(targetFile.getParent(), targetFile.getName() + ".meta");
ProtoFileDownloadDestination downloadDestination =
new ProtoFileDownloadDestination(targetFile, metadataFile);
DownloadMetadata metadata = downloadDestination.readMetadata();
assertThat(metadata).isEqualTo(DownloadMetadata.create());
}
@Test
public void metadata_fileEmpty() throws Exception {
File targetFile = temporaryFolder.newFile();
File metadataFile = new File(targetFile.getParent(), targetFile.getName() + ".meta");
ProtoFileDownloadDestination downloadDestination =
new ProtoFileDownloadDestination(targetFile, metadataFile);
DownloadMetadata metadata = downloadDestination.readMetadata();
assertThat(metadata).isEqualTo(DownloadMetadata.create());
}
@Test
public void metadata_fileNonEmpty() throws Exception {
File targetFile = temporaryFolder.newFile();
File metadataFile = new File(targetFile.getParent(), targetFile.getName() + ".meta");
ProtoFileDownloadDestination downloadDestination =
new ProtoFileDownloadDestination(targetFile, metadataFile);
Files.asCharSink(targetFile, UTF_8).write("Hello world");
DownloadMetadata metadata = downloadDestination.readMetadata();
assertThat(metadata).isEqualTo(DownloadMetadata.create());
}
@Test
public void openByteChannel_fileDoesNotExist() {
File targetFile = new File("/does/not/exist");
File metadataFile = new File(targetFile.getParent(), targetFile.getName() + ".meta");
ProtoFileDownloadDestination downloadDestination =
new ProtoFileDownloadDestination(targetFile, metadataFile);
assertThrows(
FileNotFoundException.class,
() -> downloadDestination.openByteChannel(0L, DownloadMetadata.create()));
}
@Test
public void openByteChannel_fileEmpty() throws Exception {
File targetFile = temporaryFolder.newFile();
File metadataFile = new File(targetFile.getParent(), targetFile.getName() + ".meta");
ProtoFileDownloadDestination downloadDestination =
new ProtoFileDownloadDestination(targetFile, metadataFile);
String text = "Hello world";
WritableByteChannel channel =
downloadDestination.openByteChannel(0L, DownloadMetadata.create());
assertThat(channel.isOpen()).isTrue();
CharSource.wrap(text).asByteSource(UTF_8).copyTo(Channels.newOutputStream(channel));
channel.close();
assertThat(Files.asCharSource(targetFile, UTF_8).read()).isEqualTo(text);
}
@Test
public void openByteChannel_fileNonEmpty() throws Exception {
File targetFile = temporaryFolder.newFile();
File metadataFile = new File(targetFile.getParent(), targetFile.getName() + ".meta");
ProtoFileDownloadDestination downloadDestination =
new ProtoFileDownloadDestination(targetFile, metadataFile);
String text1 = "Hello world";
Files.asCharSink(targetFile, UTF_8).write(text1);
String text2 = "Bye world";
WritableByteChannel channel =
downloadDestination.openByteChannel(targetFile.length(), DownloadMetadata.create());
assertThat(channel.isOpen()).isTrue();
CharSource.wrap(text2).asByteSource(UTF_8).copyTo(Channels.newOutputStream(channel));
channel.close();
assertThat(Files.asCharSource(targetFile, UTF_8).read()).isEqualTo(text1 + text2);
}
@Test
public void openByteChannel_metadata() throws Exception {
File targetFile = temporaryFolder.newFile();
File metadataFile = new File(targetFile.getParent(), targetFile.getName() + ".meta");
ProtoFileDownloadDestination downloadDestination =
new ProtoFileDownloadDestination(targetFile, metadataFile);
String contentTag = "content_tag_abc";
long lastModifiedTimeSeconds = 12345;
downloadDestination
.openByteChannel(0L, DownloadMetadata.create(contentTag, lastModifiedTimeSeconds))
.close();
DownloadMetadata metadata = downloadDestination.readMetadata();
assertThat(metadata).isEqualTo(DownloadMetadata.create(contentTag, lastModifiedTimeSeconds));
}
@Test
public void clear_fileNonEmpty() throws Exception {
File targetFile = temporaryFolder.newFile();
File metadataFile = new File(targetFile.getParent(), targetFile.getName() + ".meta");
ProtoFileDownloadDestination downloadDestination =
new ProtoFileDownloadDestination(targetFile, metadataFile);
Files.asCharSink(targetFile, UTF_8).write("existing");
WritableByteChannel channel1 =
downloadDestination.openByteChannel(0L, DownloadMetadata.create());
downloadDestination.clear();
WritableByteChannel channel2 =
downloadDestination.openByteChannel(0L, DownloadMetadata.create());
CharSource.wrap("swallowed").asByteSource(UTF_8).copyTo(Channels.newOutputStream(channel1));
CharSource.wrap("replacement").asByteSource(UTF_8).copyTo(Channels.newOutputStream(channel2));
channel2.close();
assertThat(Files.asCharSource(targetFile, UTF_8).read()).isEqualTo("replacement");
}
}
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