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// Copyright 2018 The Bazel Authors. 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.vfs;
import static com.google.common.truth.Truth.assertThat;
import static com.google.devtools.build.lib.testutil.MoreAsserts.assertThrows;
import com.google.common.hash.Hashing;
import com.google.devtools.build.lib.vfs.DigestHashFunction.DigestFunctionConverter;
import java.lang.reflect.Field;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/**
* Tests for DigestHashFunction, notably that the static instances can be compared with reference
* equality.
*/
@RunWith(JUnit4.class)
public class DigestHashFunctionTest {
private final DigestFunctionConverter converter = new DigestFunctionConverter();
@Before
public void resetStaticDefault() throws IllegalAccessException, NoSuchFieldException {
// The default is effectively a Singleton, and it does not allow itself to be set multiple
// times. In order to test this reasonably, though, we reset the sentinel boolean to false and
// the value to null, which are the values before setDefault is called.
Field defaultHasBeenSet = DigestHashFunction.class.getDeclaredField("defaultHasBeenSet");
defaultHasBeenSet.setAccessible(true);
defaultHasBeenSet.set(null, false);
Field defaultValue = DigestHashFunction.class.getDeclaredField("defaultHash");
defaultValue.setAccessible(true);
defaultValue.set(null, null);
}
@Test
public void convertReturnsTheSameValueAsTheConstant() throws Exception {
assertThat(converter.convert("sha-256")).isSameAs(DigestHashFunction.SHA256);
assertThat(converter.convert("SHA-256")).isSameAs(DigestHashFunction.SHA256);
assertThat(converter.convert("SHA256")).isSameAs(DigestHashFunction.SHA256);
assertThat(converter.convert("sha256")).isSameAs(DigestHashFunction.SHA256);
assertThat(converter.convert("SHA-1")).isSameAs(DigestHashFunction.SHA1);
assertThat(converter.convert("sha-1")).isSameAs(DigestHashFunction.SHA1);
assertThat(converter.convert("SHA1")).isSameAs(DigestHashFunction.SHA1);
assertThat(converter.convert("sha1")).isSameAs(DigestHashFunction.SHA1);
assertThat(converter.convert("MD5")).isSameAs(DigestHashFunction.MD5);
assertThat(converter.convert("md5")).isSameAs(DigestHashFunction.MD5);
}
@Test
public void lateRegistrationGetsPickedUpByConverter() throws Exception {
DigestHashFunction.register(Hashing.goodFastHash(32), "goodFastHash32");
assertThat(converter.convert("goodFastHash32")).isSameAs(converter.convert("GOODFASTHASH32"));
}
@Test
public void lateRegistrationWithAlternativeNamesGetsPickedUpByConverter() throws Exception {
DigestHashFunction.register(
Hashing.goodFastHash(64), "goodFastHash64", "goodFastHash-64", "good-fast-hash-64");
assertThat(converter.convert("goodFastHash64")).isSameAs(converter.convert("GOODFASTHASH64"));
assertThat(converter.convert("goodFastHash64")).isSameAs(converter.convert("goodFastHash-64"));
assertThat(converter.convert("goodFastHash64"))
.isSameAs(converter.convert("good-fast-hash-64"));
assertThat(converter.convert("goodFastHash64"))
.isSameAs(converter.convert("GOOD-fast-HASH-64"));
}
@Test
public void unsetDefaultThrows() {
assertThrows(
DigestHashFunction.DefaultNotSetException.class, () -> DigestHashFunction.getDefault());
}
@Test
public void setDefaultDoesNotThrow() throws Exception {
DigestHashFunction.setDefault(DigestHashFunction.SHA1);
DigestHashFunction.getDefault();
}
@Test
public void cannotSetDefaultMultipleTimes() throws Exception {
DigestHashFunction.setDefault(DigestHashFunction.MD5);
assertThrows(
DigestHashFunction.DefaultAlreadySetException.class,
() -> DigestHashFunction.setDefault(DigestHashFunction.SHA1));
}
}
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