| // Copyright 2019 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.util; |
| |
| import com.google.common.testing.EqualsTester; |
| import java.math.BigInteger; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.JUnit4; |
| |
| /** Tests for {@link BigIntegerFingerprint}, mostly just checking basic collision avoidance. */ |
| @RunWith(JUnit4.class) |
| public class BigIntegerFingerprintTest { |
| @Test |
| public void noClashes() { |
| BigInteger long2Then1 = new BigIntegerFingerprint().addLong(2L).addLong(1L).getFingerprint(); |
| BigInteger long1Then32 = |
| new BigIntegerFingerprint() |
| .addLong(1L) |
| .addLong(BigIntegerFingerprintUtils.RELATIVE_PRIME_INT + 1L) |
| .getFingerprint(); |
| BigInteger trueThenFalse = |
| new BigIntegerFingerprint().addBoolean(true).addBoolean(false).getFingerprint(); |
| BigInteger falseThen32 = |
| new BigIntegerFingerprint() |
| .addBoolean(false) |
| .addLong(BigIntegerFingerprintUtils.RELATIVE_PRIME_INT + 1L) |
| .getFingerprint(); |
| BigInteger bigIntOneThen0 = |
| new BigIntegerFingerprint() |
| .addBigIntegerOrdered(BigInteger.ONE) |
| .addLong(0L) |
| .getFingerprint(); |
| BigInteger long0ThenBigIntOne = |
| new BigIntegerFingerprint() |
| .addLong(0L) |
| .addBigIntegerOrdered(BigInteger.ONE) |
| .getFingerprint(); |
| BigInteger bigIntOneThenTrue = |
| new BigIntegerFingerprint() |
| .addBigIntegerOrdered(BigInteger.ONE) |
| .addBoolean(true) |
| .getFingerprint(); |
| BigInteger trueThenBigIntOne = |
| new BigIntegerFingerprint() |
| .addBoolean(true) |
| .addBigIntegerOrdered(BigInteger.ONE) |
| .getFingerprint(); |
| BigInteger long0ThenBigIntZero = |
| new BigIntegerFingerprint() |
| .addLong(0L) |
| .addBigIntegerOrdered(BigInteger.ZERO) |
| .getFingerprint(); |
| BigInteger bigIntZeroThenLong0 = |
| new BigIntegerFingerprint() |
| .addBigIntegerOrdered(BigInteger.ZERO) |
| .addLong(1L) |
| .getFingerprint(); |
| new EqualsTester() |
| .addEqualityGroup(long2Then1) |
| .addEqualityGroup(long1Then32) |
| .addEqualityGroup(trueThenFalse) |
| .addEqualityGroup(falseThen32) |
| .addEqualityGroup(bigIntOneThen0) |
| .addEqualityGroup(long0ThenBigIntOne) |
| .addEqualityGroup(bigIntOneThenTrue) |
| .addEqualityGroup(trueThenBigIntOne) |
| .addEqualityGroup(long0ThenBigIntZero) |
| .addEqualityGroup(bigIntZeroThenLong0) |
| .testEquals(); |
| } |
| } |