src/test/java/com/google/devtools/build/lib/unix/FilesystemUtilsTest.java

// Copyright 2014 Google Inc. All rights reserved.
//
// 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.devtools.build.lib.unix;

import static com.google.common.truth.Truth.assertThat;

import com.google.common.hash.HashCode;
import com.google.devtools.build.lib.testutil.TestUtils;
import com.google.devtools.build.lib.vfs.FileSystem;
import com.google.devtools.build.lib.vfs.FileSystemUtils;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.lib.vfs.UnixFileSystem;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

import java.io.File;
import java.util.HashMap;

/**
 * This class tests the FilesystemUtils class.
 */
@RunWith(JUnit4.class)
public class FilesystemUtilsTest {
  private FileSystem testFS;
  private Path workingDir;
  private Path testFile;

  @Before
  public void setUp() throws Exception {
    testFS = new UnixFileSystem();
    workingDir = testFS.getPath(new File(TestUtils.tmpDir()).getCanonicalPath());
    testFile = workingDir.getRelative("test");
    FileSystemUtils.createEmptyFile(testFile);
  }

  /**
   * This test validates that the md5sum() method returns hashes that match the official test
   * vectors specified in RFC 1321, The MD5 Message-Digest Algorithm.
   *
   * @throws Exception
   */
  @Test
  public void testValidateMd5Sum() throws Exception {
    HashMap<String, String> testVectors = new HashMap<>();
    testVectors.put("", "d41d8cd98f00b204e9800998ecf8427e");
    testVectors.put("a", "0cc175b9c0f1b6a831c399e269772661");
    testVectors.put("abc", "900150983cd24fb0d6963f7d28e17f72");
    testVectors.put("message digest", "f96b697d7cb7938d525a2f31aaf161d0");
    testVectors.put("abcdefghijklmnopqrstuvwxyz", "c3fcd3d76192e4007dfb496cca67e13b");
    testVectors.put("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
        "d174ab98d277d9f5a5611c2c9f419d9f");
    testVectors.put(
        "12345678901234567890123456789012345678901234567890123456789012345678901234567890",
        "57edf4a22be3c955ac49da2e2107b67a");

    for (String testInput : testVectors.keySet()) {
      FileSystemUtils.writeContentAsLatin1(testFile, testInput);
      HashCode result = FilesystemUtils.md5sum(testFile.getPathString());
      assertThat(testVectors).containsEntry(testInput, result.toString());
    }
  }
}