/*
* Copyright 2015-present Facebook, Inc.
*
* 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.facebook.buck.hashing;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.not;
import static org.junit.Assert.assertThat;
import com.facebook.buck.io.ProjectFilesystem;
import com.facebook.buck.testutil.FakeProjectFileHashCache;
import com.facebook.buck.testutil.FakeProjectFilesystem;
import com.facebook.buck.timing.SettableFakeClock;
import com.facebook.buck.util.cache.ProjectFileHashCache;
import com.google.common.collect.ImmutableMap;
import com.google.common.hash.Hasher;
import com.google.common.hash.Hashing;
import java.io.IOException;
import java.nio.file.Paths;
import org.junit.Test;
/** Unit tests for {@link PathHashing}. */
public class PathHashingTest {
private ProjectFilesystem projectFilesystem = new FakeProjectFilesystem();
private ProjectFileHashCache fileHashCache =
FakeProjectFileHashCache.createFromStrings(
projectFilesystem,
ImmutableMap.of(
"foo/foo.txt", "abcdef",
"foo/bar.txt", "abcdef",
"foo/baz.txt", "abcdef"));
private ProjectFileHashCache modifiedFileHashCache =
FakeProjectFileHashCache.createFromStrings(
projectFilesystem,
ImmutableMap.of(
"foo/foo.txt", "123456",
"foo/bar.txt", "123456",
"foo/baz.txt", "123456"));
@Test
public void sameContentsSameNameHaveSameHash() throws IOException {
SettableFakeClock clock = new SettableFakeClock(1000, 0);
FakeProjectFilesystem filesystem1 = new FakeProjectFilesystem(clock);
filesystem1.touch(Paths.get("foo/bar.txt"));
FakeProjectFilesystem filesystem2 = new FakeProjectFilesystem(clock);
filesystem2.touch(Paths.get("foo/bar.txt"));
Hasher hasher1 = Hashing.sha1().newHasher();
PathHashing.hashPath(hasher1, fileHashCache, filesystem1, Paths.get("foo"));
Hasher hasher2 = Hashing.sha1().newHasher();
PathHashing.hashPath(hasher2, fileHashCache, filesystem2, Paths.get("foo"));
assertThat(hasher1.hash(), equalTo(hasher2.hash()));
}
@Test
public void sameContentsDifferentNameHaveDifferentHashes() throws IOException {
SettableFakeClock clock = new SettableFakeClock(1000, 0);
FakeProjectFilesystem filesystem1 = new FakeProjectFilesystem(clock);
filesystem1.touch(Paths.get("foo/bar.txt"));
FakeProjectFilesystem filesystem2 = new FakeProjectFilesystem(clock);
filesystem2.touch(Paths.get("foo/baz.txt"));
Hasher hasher1 = Hashing.sha1().newHasher();
PathHashing.hashPath(hasher1, fileHashCache, filesystem1, Paths.get("foo"));
Hasher hasher2 = Hashing.sha1().newHasher();
PathHashing.hashPath(hasher2, fileHashCache, filesystem2, Paths.get("foo"));
assertThat(hasher1.hash(), not(equalTo(hasher2.hash())));
}
@Test
public void sameNameDifferentContentsHaveDifferentHashes() throws IOException {
SettableFakeClock clock = new SettableFakeClock(1000, 0);
FakeProjectFilesystem filesystem1 = new FakeProjectFilesystem(clock);
filesystem1.touch(Paths.get("foo/bar.txt"));
FakeProjectFilesystem filesystem2 = new FakeProjectFilesystem(clock);
filesystem2.touch(Paths.get("foo/bar.txt"));
Hasher hasher1 = Hashing.sha1().newHasher();
PathHashing.hashPath(hasher1, fileHashCache, filesystem1, Paths.get("foo"));
Hasher hasher2 = Hashing.sha1().newHasher();
PathHashing.hashPath(hasher2, modifiedFileHashCache, filesystem2, Paths.get("foo"));
assertThat(hasher1.hash(), not(equalTo(hasher2.hash())));
}
@Test
public void hashDoesNotDependOnFilesystemIterationOrder() throws IOException {
SettableFakeClock clock = new SettableFakeClock(1000, 0);
FakeProjectFilesystem filesystem1 = new FakeProjectFilesystem(clock);
filesystem1.touch(Paths.get("foo/foo.txt"));
filesystem1.touch(Paths.get("foo/bar.txt"));
filesystem1.touch(Paths.get("foo/baz.txt"));
FakeProjectFilesystem filesystem2 = new FakeProjectFilesystem(clock);
filesystem2.touch(Paths.get("foo/bar.txt"));
filesystem2.touch(Paths.get("foo/baz.txt"));
filesystem2.touch(Paths.get("foo/foo.txt"));
Hasher hasher1 = Hashing.sha1().newHasher();
PathHashing.hashPath(hasher1, fileHashCache, filesystem1, Paths.get("foo"));
Hasher hasher2 = Hashing.sha1().newHasher();
PathHashing.hashPath(hasher2, fileHashCache, filesystem2, Paths.get("foo"));
assertThat(hasher1.hash(), equalTo(hasher2.hash()));
}
}