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MoreFilesFileTraverserTest.java
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MoreFilesFileTraverserTest.java
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/*
* Copyright (C) 2017 The Guava Authors
*
* 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.common.io;
import static com.google.common.truth.Truth.assertThat;
import com.google.common.collect.Iterables;
import com.google.common.jimfs.Configuration;
import com.google.common.jimfs.Jimfs;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import junit.framework.TestCase;
/**
* Tests for {@link MoreFiles#fileTraverser()}.
*
* @author Jens Nyman
*/
public class MoreFilesFileTraverserTest extends TestCase {
private Path rootDir;
@Override
public void setUp() throws IOException {
rootDir = Jimfs.newFileSystem(Configuration.unix()).getPath("/tmp");
Files.createDirectory(rootDir);
}
@Override
public void tearDown() throws IOException {
rootDir.getFileSystem().close();
}
public void testFileTraverser_emptyDirectory() throws Exception {
assertThat(MoreFiles.fileTraverser().breadthFirst(rootDir)).containsExactly(rootDir);
}
public void testFileTraverser_nonExistingFile() throws Exception {
Path file = rootDir.resolve("file-that-doesnt-exist");
assertThat(MoreFiles.fileTraverser().breadthFirst(file)).containsExactly(file);
}
public void testFileTraverser_file() throws Exception {
Path file = newFile("some-file");
assertThat(MoreFiles.fileTraverser().breadthFirst(file)).containsExactly(file);
}
public void testFileTraverser_singleFile() throws Exception {
Path file = newFile("some-file");
assertThat(MoreFiles.fileTraverser().breadthFirst(rootDir)).containsExactly(rootDir, file);
}
public void testFileTraverser_singleDirectory() throws Exception {
Path file = newDir("some-dir");
assertThat(MoreFiles.fileTraverser().breadthFirst(rootDir)).containsExactly(rootDir, file);
}
public void testFileTraverser_multipleFilesAndDirectories() throws Exception {
Path fileA = newFile("file-a");
Path fileB = newFile("file-b");
Path dir1 = newDir("dir-1");
Path dir2 = newDir("dir-2");
assertThat(MoreFiles.fileTraverser().breadthFirst(rootDir))
.containsExactly(rootDir, fileA, fileB, dir1, dir2);
}
public void testFileTraverser_multipleDirectoryLayers_breadthFirstStartsWithTopLayer()
throws Exception {
Path fileA = newFile("file-a");
Path dir1 = newDir("dir-1");
newFile("dir-1/file-b");
newFile("dir-1/dir-2");
assertThat(Iterables.limit(MoreFiles.fileTraverser().breadthFirst(rootDir), 3))
.containsExactly(rootDir, fileA, dir1);
}
public void testFileTraverser_multipleDirectoryLayers_traversalReturnsAll() throws Exception {
Path fileA = newFile("file-a");
Path dir1 = newDir("dir-1");
Path fileB = newFile("dir-1/file-b");
Path dir2 = newFile("dir-1/dir-2");
assertThat(MoreFiles.fileTraverser().breadthFirst(rootDir))
.containsExactly(rootDir, fileA, fileB, dir1, dir2);
}
@CanIgnoreReturnValue
private Path newDir(String name) throws IOException {
Path dir = rootDir.resolve(name);
Files.createDirectory(dir);
return dir;
}
@CanIgnoreReturnValue
private Path newFile(String name) throws IOException {
Path file = rootDir.resolve(name);
MoreFiles.touch(file);
return file;
}
}