| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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. |
| */ |
| /** |
| * @author Elena Semukhina |
| * @version $Revision$ |
| */ |
| |
| package org.apache.harmony.math.tests.java.math; |
| |
| import dalvik.annotation.TestTargetClass; |
| import dalvik.annotation.TestTargets; |
| import dalvik.annotation.TestLevel; |
| import dalvik.annotation.TestTargetNew; |
| |
| import java.math.BigInteger; |
| |
| import junit.framework.TestCase; |
| @TestTargetClass(BigInteger.class) |
| /** |
| * Class: java.math.BigInteger |
| * Method: hashCode() |
| */ |
| public class BigIntegerHashCodeTest extends TestCase { |
| /** |
| * Test hash codes for the same object |
| */ |
| @TestTargetNew( |
| level = TestLevel.PARTIAL_COMPLETE, |
| notes = "This is a complete subset of tests for hashCode method.", |
| method = "hashCode", |
| args = {} |
| ) |
| public void testSameObject() { |
| String value1 = "12378246728727834290276457386374882976782849"; |
| String value2 = "-5634562095872038262928728727834290276457386374882976782849"; |
| BigInteger aNumber1 = new BigInteger(value1); |
| BigInteger aNumber2 = new BigInteger(value2); |
| int code1 = aNumber1.hashCode(); |
| aNumber1.add(aNumber2).shiftLeft(125); |
| aNumber1.subtract(aNumber2).shiftRight(125); |
| aNumber1.multiply(aNumber2).toByteArray(); |
| aNumber1.divide(aNumber2).bitLength(); |
| aNumber1.gcd(aNumber2).pow(7); |
| int code2 = aNumber1.hashCode(); |
| assertTrue("hash codes for the same object differ", code1 == code2); |
| } |
| |
| /** |
| * Test hash codes for equal objects. |
| */ |
| @TestTargetNew( |
| level = TestLevel.PARTIAL_COMPLETE, |
| notes = "This is a complete subset of tests for hashCode method.", |
| method = "hashCode", |
| args = {} |
| ) |
| public void testEqualObjects() { |
| String value1 = "12378246728727834290276457386374882976782849"; |
| String value2 = "12378246728727834290276457386374882976782849"; |
| BigInteger aNumber1 = new BigInteger(value1); |
| BigInteger aNumber2 = new BigInteger(value2); |
| int code1 = aNumber1.hashCode(); |
| int code2 = aNumber2.hashCode(); |
| if (aNumber1.equals(aNumber2)) { |
| assertTrue("hash codes for equal objects are unequal", code1 == code2); |
| } |
| } |
| |
| /** |
| * Test hash codes for unequal objects. |
| * The codes are unequal. |
| */ |
| @TestTargetNew( |
| level = TestLevel.PARTIAL_COMPLETE, |
| notes = "This is a complete subset of tests for hashCode method.", |
| method = "hashCode", |
| args = {} |
| ) |
| public void testUnequalObjectsUnequal() { |
| String value1 = "12378246728727834290276457386374882976782849"; |
| String value2 = "-5634562095872038262928728727834290276457386374882976782849"; |
| BigInteger aNumber1 = new BigInteger(value1); |
| BigInteger aNumber2 = new BigInteger(value2); |
| int code1 = aNumber1.hashCode(); |
| int code2 = aNumber2.hashCode(); |
| if (!aNumber1.equals(aNumber2)) { |
| assertTrue("hash codes for unequal objects are equal", code1 != code2); |
| } |
| } |
| } |