| // Copyright 2023 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 static com.google.common.truth.Truth.assertThat; |
| |
| import com.google.testing.junit.testparameterinjector.TestParameter; |
| import com.google.testing.junit.testparameterinjector.TestParameterInjector; |
| import java.util.Objects; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| |
| @RunWith(TestParameterInjector.class) |
| public final class HashCodesTest { |
| private static final String O_1 = "one"; |
| private static final String O_2 = "two"; |
| private static final String O_3 = "three"; |
| private static final String O_4 = "four"; |
| private static final String O_5 = "five"; |
| |
| @Test |
| public void hashObject_returnsHashCode() { |
| assertThat(HashCodes.hashObject(O_1)).isEqualTo(O_1.hashCode()); |
| } |
| |
| @Test |
| public void hashNull_returnsZero() { |
| assertThat(HashCodes.hashObject(null)).isEqualTo(0); |
| } |
| |
| @Test |
| public void hashTwoObjects_sameAsObjectsHash( |
| @TestParameter boolean isFirstNull, @TestParameter boolean isSecondNull) { |
| Object s1 = isFirstNull ? null : O_1; |
| Object s2 = isSecondNull ? null : O_2; |
| assertThat(HashCodes.hashObjects(s1, s2)).isEqualTo(Objects.hash(s1, s2)); |
| } |
| |
| @Test |
| public void hashThreeObjects_sameAsObjectsHash( |
| @TestParameter boolean isFirstNull, |
| @TestParameter boolean isSecondNull, |
| @TestParameter boolean isThirdNull) { |
| Object s1 = isFirstNull ? null : O_1; |
| Object s2 = isSecondNull ? null : O_2; |
| Object s3 = isThirdNull ? null : O_3; |
| assertThat(HashCodes.hashObjects(s1, s2, s3)).isEqualTo(Objects.hash(s1, s2, s3)); |
| } |
| |
| @Test |
| public void hashFourObjects_sameAsObjectsHash( |
| @TestParameter boolean isFirstNull, |
| @TestParameter boolean isSecondNull, |
| @TestParameter boolean isThirdNull, |
| @TestParameter boolean isFourthNull) { |
| Object s1 = isFirstNull ? null : O_1; |
| Object s2 = isSecondNull ? null : O_2; |
| Object s3 = isThirdNull ? null : O_3; |
| Object s4 = isFourthNull ? null : O_4; |
| assertThat(HashCodes.hashObjects(s1, s2, s3, s4)).isEqualTo(Objects.hash(s1, s2, s3, s4)); |
| } |
| |
| @Test |
| public void hashFiveObjects_sameAsObjectsHash( |
| @TestParameter boolean isFirstNull, |
| @TestParameter boolean isSecondNull, |
| @TestParameter boolean isThirdNull, |
| @TestParameter boolean isFourthNull, |
| @TestParameter boolean isFifthNull) { |
| Object s1 = isFirstNull ? null : O_1; |
| Object s2 = isSecondNull ? null : O_2; |
| Object s3 = isThirdNull ? null : O_3; |
| Object s4 = isFourthNull ? null : O_4; |
| Object s5 = isFifthNull ? null : O_5; |
| assertThat(HashCodes.hashObjects(s1, s2, s3, s4, s5)) |
| .isEqualTo(Objects.hash(s1, s2, s3, s4, s5)); |
| } |
| } |