1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package libcore.java.math; 18 19 import java.math.BigInteger; 20 21 public class BigIntegerTest extends junit.framework.TestCase { 22 // http://code.google.com/p/android/issues/detail?id=18452 23 public void test_hashCode() { 24 BigInteger firstBig = new BigInteger("30003543667898318853"); 25 BigInteger secondBig = new BigInteger("3298535022597"); 26 BigInteger andedBigs = firstBig.and(secondBig); 27 BigInteger toCompareBig = BigInteger.valueOf(andedBigs.longValue()); 28 assertEquals(andedBigs, toCompareBig); 29 assertEquals(andedBigs.hashCode(), toCompareBig.hashCode()); 30 } 31 32 // http://b/2981072 - off-by-one error in BigInteger.valueOf 33 public void test_valueOf() { 34 // I assume here that we'll never cache more than 1024 values. 35 // (At the moment, we cache -1 to 10.) 36 for (int i = -1024; i <= 1024; ++i) { 37 assertEquals(i, BigInteger.valueOf(i).intValue()); 38 } 39 } 40 41 // http://code.google.com/p/android/issues/detail?id=7036 42 public void test_invalidBigIntegerStringConversions() { 43 // Check we don't disallow related reasonable strings... 44 new BigInteger("1", 10); 45 new BigInteger("1a", 16); 46 new BigInteger("-1", 10); 47 new BigInteger("-1a", 16); 48 new BigInteger("\u0661", 10); 49 new BigInteger("\u0661a", 16); 50 new BigInteger("-\u0661", 10); 51 new BigInteger("-\u0661a", 16); 52 // This is allowed from Java 7 on. 53 new BigInteger("+1"); 54 // Now check the invalid cases... 55 try { 56 new BigInteger("-a"); // no digits from other bases. 57 fail(); 58 } catch (NumberFormatException expected) { 59 } 60 try { 61 new BigInteger("-1a"); // no trailing digits from other bases. 62 fail(); 63 } catch (NumberFormatException expected) { 64 } 65 try { 66 new BigInteger("-1 hello"); // no trailing junk at all. 67 fail(); 68 } catch (NumberFormatException expected) { 69 } 70 try { 71 new BigInteger("--1"); // only one sign. 72 fail(); 73 } catch (NumberFormatException expected) { 74 } 75 try { 76 new BigInteger(""); // at least one digit. 77 fail(); 78 } catch (NumberFormatException expected) { 79 } 80 try { 81 new BigInteger("-"); // at least one digit, even after a sign. 82 fail(); 83 } catch (NumberFormatException expected) { 84 } 85 } 86 } 87
