1 /*
   2  * Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 import java.math.BigDecimal;
  25 import java.math.RoundingMode;
  26 
  27 /**
  28  * @test Test Math and StrictMath Floor Div / Modulo operations.
  29  * @bug 6282196
  30  * @summary Basic tests for Floor division and modulo methods for both Math
  31  * and StrictMath for int and long datatypes.
  32  */
  33 public class DivModTests {
  34 
  35     /**
  36      * The count of test errors.
  37      */
  38     private static int errors = 0;
  39 
  40     /**
  41      * @param args the command line arguments are unused
  42      */
  43     public static void main(String[] args) {
  44         errors = 0;
  45         testIntFloorDivMod();
  46         testLongFloorDivMod();
  47 
  48         if (errors > 0) {
  49             throw new RuntimeException(errors + " errors found in DivMod methods.");
  50         }
  51     }
  52 
  53     /**
  54      * Report a test failure and increment the error count.
  55      * @param message the formatting string
  56      * @param args the variable number of arguments for the message.
  57      */
  58     static void fail(String message, Object... args) {
  59         errors++;
  60         System.out.printf(message, args);
  61     }
  62 
  63     /**
  64      * Test the integer floorDiv and floorMod methods.
  65      * Math and StrictMath tested and the same results are expected for both.
  66      */
  67     static void testIntFloorDivMod() {
  68         testIntFloorDivMod(4, 0, new ArithmeticException(), new ArithmeticException()); // Should throw ArithmeticException
  69         testIntFloorDivMod(4, 3, 1, 1);
  70         testIntFloorDivMod(3, 3, 1, 0);
  71         testIntFloorDivMod(2, 3, 0, 2);
  72         testIntFloorDivMod(1, 3, 0, 1);
  73         testIntFloorDivMod(0, 3, 0, 0);
  74         testIntFloorDivMod(4, -3, -2, -2);
  75         testIntFloorDivMod(3, -3, -1, 0);
  76         testIntFloorDivMod(2, -3, -1, -1);
  77         testIntFloorDivMod(1, -3, -1, -2);
  78         testIntFloorDivMod(0, -3, 0, 0);
  79         testIntFloorDivMod(-1, 3, -1, 2);
  80         testIntFloorDivMod(-2, 3, -1, 1);
  81         testIntFloorDivMod(-3, 3, -1, 0);
  82         testIntFloorDivMod(-4, 3, -2, 2);
  83         testIntFloorDivMod(-1, -3, 0, -1);
  84         testIntFloorDivMod(-2, -3, 0, -2);
  85         testIntFloorDivMod(-3, -3, 1, 0);
  86         testIntFloorDivMod(-4, -3, 1, -1);
  87         testIntFloorDivMod(Integer.MAX_VALUE, 1, Integer.MAX_VALUE, 0);
  88         testIntFloorDivMod(Integer.MAX_VALUE, -1, -Integer.MAX_VALUE, 0);
  89         testIntFloorDivMod(Integer.MAX_VALUE, 3, 715827882, 1);
  90         testIntFloorDivMod(Integer.MAX_VALUE - 1, 3, 715827882, 0);
  91         testIntFloorDivMod(Integer.MIN_VALUE, 3, -715827883, 1);
  92         testIntFloorDivMod(Integer.MIN_VALUE + 1, 3, -715827883, 2);
  93         testIntFloorDivMod(Integer.MIN_VALUE + 1, -1, Integer.MAX_VALUE, 0);
  94         testIntFloorDivMod(Integer.MAX_VALUE, Integer.MAX_VALUE, 1, 0);
  95         testIntFloorDivMod(Integer.MAX_VALUE, Integer.MIN_VALUE, -1, -1);
  96         testIntFloorDivMod(Integer.MIN_VALUE, Integer.MIN_VALUE, 1, 0);
  97         testIntFloorDivMod(Integer.MIN_VALUE, Integer.MAX_VALUE, -2, 2147483646);
  98         // Special case of integer overflow
  99         testIntFloorDivMod(Integer.MIN_VALUE, -1, Integer.MIN_VALUE, 0);
 100     }
 101 
 102     /**
 103      * Test FloorDiv and then FloorMod with int data.
 104      */
 105     static void testIntFloorDivMod(int x, int y, Object divExpected, Object modExpected) {
 106         testIntFloorDiv(x, y, divExpected);
 107         testIntFloorMod(x, y, modExpected);
 108     }
 109 
 110     /**
 111      * Test FloorDiv with int data.
 112      */
 113     static void testIntFloorDiv(int x, int y, Object expected) {
 114         Object result = doFloorDiv(x, y);
 115         if (!resultEquals(result, expected)) {
 116             fail("FAIL: Math.floorDiv(%d, %d) = %s; expected %s%n", x, y, result, expected);
 117         }
 118 
 119         Object strict_result = doStrictFloorDiv(x, y);
 120         if (!resultEquals(strict_result, expected)) {
 121             fail("FAIL: StrictMath.floorDiv(%d, %d) = %s; expected %s%n", x, y, strict_result, expected);
 122         }
 123     }
 124 
 125     /**
 126      * Test FloorMod with int data.
 127      */
 128     static void testIntFloorMod(int x, int y, Object expected) {
 129         Object result = doFloorMod(x, y);
 130         if (!resultEquals(result, expected)) {
 131             fail("FAIL: Math.floorMod(%d, %d) = %s; expected %s%n", x, y, result, expected);
 132         }
 133 
 134         Object strict_result = doStrictFloorMod(x, y);
 135         if (!resultEquals(strict_result, expected)) {
 136             fail("FAIL: StrictMath.floorMod(%d, %d) = %s; expected %s%n", x, y, strict_result, expected);
 137         }
 138 
 139         try {
 140             // Verify result against double precision floor function
 141             int tmp = x / y;     // Force ArithmeticException for divide by zero
 142             double ff = x - Math.floor((double)x / (double)y) * y;
 143             int fr = (int)ff;
 144             boolean t = (fr == ((Integer)result));
 145             if (!result.equals(fr)) {
 146                 fail("FAIL: Math.floorMod(%d, %d) = %s differs from Math.floor(x, y): %d%n", x, y, result, fr);
 147             }
 148         } catch (ArithmeticException ae) {
 149             if (y != 0) {
 150                 fail("FAIL: Math.floorMod(%d, %d); unexpected %s%n", x, y, ae);
 151             }
 152         }
 153     }
 154 
 155     /**
 156      * Test the floorDiv and floorMod methods for primitive long.
 157      */
 158     static void testLongFloorDivMod() {
 159         testLongFloorDivMod(4L, 0L, new ArithmeticException(), new ArithmeticException()); // Should throw ArithmeticException
 160         testLongFloorDivMod(4L, 3L, 1L, 1L);
 161         testLongFloorDivMod(3L, 3L, 1L, 0L);
 162         testLongFloorDivMod(2L, 3L, 0L, 2L);
 163         testLongFloorDivMod(1L, 3L, 0L, 1L);
 164         testLongFloorDivMod(0L, 3L, 0L, 0L);
 165         testLongFloorDivMod(4L, -3L, -2L, -2L);
 166         testLongFloorDivMod(3L, -3L, -1L, 0l);
 167         testLongFloorDivMod(2L, -3L, -1L, -1L);
 168         testLongFloorDivMod(1L, -3L, -1L, -2L);
 169         testLongFloorDivMod(0L, -3L, 0L, 0L);
 170         testLongFloorDivMod(-1L, 3L, -1L, 2L);
 171         testLongFloorDivMod(-2L, 3L, -1L, 1L);
 172         testLongFloorDivMod(-3L, 3L, -1L, 0L);
 173         testLongFloorDivMod(-4L, 3L, -2L, 2L);
 174         testLongFloorDivMod(-1L, -3L, 0L, -1L);
 175         testLongFloorDivMod(-2L, -3L, 0L, -2L);
 176         testLongFloorDivMod(-3L, -3L, 1L, 0L);
 177         testLongFloorDivMod(-4L, -3L, 1L, -1L);
 178 
 179         testLongFloorDivMod(Long.MAX_VALUE, 1, Long.MAX_VALUE, 0L);
 180         testLongFloorDivMod(Long.MAX_VALUE, -1, -Long.MAX_VALUE, 0L);
 181         testLongFloorDivMod(Long.MAX_VALUE, 3L, Long.MAX_VALUE / 3L, 1L);
 182         testLongFloorDivMod(Long.MAX_VALUE - 1L, 3L, (Long.MAX_VALUE - 1L) / 3L, 0L);
 183         testLongFloorDivMod(Long.MIN_VALUE, 3L, Long.MIN_VALUE / 3L - 1L, 1L);
 184         testLongFloorDivMod(Long.MIN_VALUE + 1L, 3L, Long.MIN_VALUE / 3L - 1L, 2L);
 185         testLongFloorDivMod(Long.MIN_VALUE + 1, -1, Long.MAX_VALUE, 0L);
 186         testLongFloorDivMod(Long.MAX_VALUE, Long.MAX_VALUE, 1L, 0L);
 187         testLongFloorDivMod(Long.MAX_VALUE, Long.MIN_VALUE, -1L, -1L);
 188         testLongFloorDivMod(Long.MIN_VALUE, Long.MIN_VALUE, 1L, 0L);
 189         testLongFloorDivMod(Long.MIN_VALUE, Long.MAX_VALUE, -2L, 9223372036854775806L);
 190         // Special case of integer overflow
 191         testLongFloorDivMod(Long.MIN_VALUE, -1, Long.MIN_VALUE, 0L);
 192     }
 193 
 194     /**
 195      * Test the long floorDiv and floorMod methods.
 196      * Math and StrictMath are tested and the same results are expected for both.
 197      */
 198     static void testLongFloorDivMod(long x, long y, Object divExpected, Object modExpected) {
 199         testLongFloorDiv(x, y, divExpected);
 200         testLongFloorMod(x, y, modExpected);
 201     }
 202 
 203     /**
 204      * Test FloorDiv with long arguments against expected value.
 205      * The expected value is usually a Long but in some cases  is
 206      * an ArithmeticException.
 207      *
 208      * @param x dividend
 209      * @param y modulus
 210      * @param expected expected value,
 211      */
 212     static void testLongFloorDiv(long x, long y, Object expected) {
 213         Object result = doFloorDiv(x, y);
 214         if (!resultEquals(result, expected)) {
 215             fail("FAIL: long Math.floorDiv(%d, %d) = %s; expected %s%n", x, y, result, expected);
 216         }
 217 
 218         Object strict_result = doStrictFloorDiv(x, y);
 219         if (!resultEquals(strict_result, expected)) {
 220             fail("FAIL: long StrictMath.floorDiv(%d, %d) = %s; expected %s%n", x, y, strict_result, expected);
 221         }
 222     }
 223 
 224     /**
 225      * Test FloorMod of long arguments against expected value.
 226      * The expected value is usually a Long but in some cases  is
 227      * an ArithmeticException.
 228      *
 229      * @param x dividend
 230      * @param y modulus
 231      * @param expected expected value
 232      */
 233     static void testLongFloorMod(long x, long y, Object expected) {
 234         Object result = doFloorMod(x, y);
 235         if (!resultEquals(result, expected)) {
 236             fail("FAIL: long Math.floorMod(%d, %d) = %s; expected %s%n", x, y, result, expected);
 237         }
 238 
 239         Object strict_result = doStrictFloorMod(x, y);
 240         if (!resultEquals(strict_result, expected)) {
 241             fail("FAIL: long StrictMath.floorMod(%d, %d) = %s; expected %s%n", x, y, strict_result, expected);
 242         }
 243 
 244         try {
 245             // Verify the result against BigDecimal rounding mode.
 246             BigDecimal xD = new BigDecimal(x);
 247             BigDecimal yD = new BigDecimal(y);
 248             BigDecimal resultD = xD.divide(yD, RoundingMode.FLOOR);
 249             resultD = resultD.multiply(yD);
 250             resultD = xD.subtract(resultD);
 251             long fr = resultD.longValue();
 252             if (!result.equals(fr)) {
 253                 fail("FAIL: Long.floorMod(%d, %d) = %d is different than BigDecimal result: %d%n", x, y, result, fr);
 254 
 255             }
 256         } catch (ArithmeticException ae) {
 257             if (y != 0) {
 258                 fail("FAIL: long Math.floorMod(%d, %d); unexpected ArithmeticException from bigdecimal");
 259             }
 260         }
 261     }
 262 
 263     /**
 264      * Test the floorDiv and floorMod methods for mixed long and int.
 265      */
 266     static void testLongIntFloorDivMod() {
 267         testLongIntFloorDivMod(4L, 0, new ArithmeticException(), new ArithmeticException()); // Should throw ArithmeticException
 268         testLongIntFloorDivMod(4L, 3, 1L, 1);
 269         testLongIntFloorDivMod(3L, 3, 1L, 0);
 270         testLongIntFloorDivMod(2L, 3, 0L, 2);
 271         testLongIntFloorDivMod(1L, 3, 0L, 1);
 272         testLongIntFloorDivMod(0L, 3, 0L, 0);
 273         testLongIntFloorDivMod(4L, -3, -2L, -2);
 274         testLongIntFloorDivMod(3L, -3, -1L, 0);
 275         testLongIntFloorDivMod(2L, -3, -1L, -1);
 276         testLongIntFloorDivMod(1L, -3, -1L, -2);
 277         testLongIntFloorDivMod(0L, -3, 0L, 0);
 278         testLongIntFloorDivMod(-1L, 3, -1L, 2);
 279         testLongIntFloorDivMod(-2L, 3, -1L, 1);
 280         testLongIntFloorDivMod(-3L, 3, -1L, 0);
 281         testLongIntFloorDivMod(-4L, 3, -2L, 2);
 282         testLongIntFloorDivMod(-1L, -3, 0L, -1);
 283         testLongIntFloorDivMod(-2L, -3, 0L, -2);
 284         testLongIntFloorDivMod(-3L, -3, 1L, 0);
 285         testLongIntFloorDivMod(-4L, -3, 1L, -1);
 286 
 287         testLongIntFloorDivMod(Long.MAX_VALUE, 1, Long.MAX_VALUE, 0L);
 288         testLongIntFloorDivMod(Long.MAX_VALUE, -1, -Long.MAX_VALUE, 0L);
 289         testLongIntFloorDivMod(Long.MAX_VALUE, 3, Long.MAX_VALUE / 3L, 1L);
 290         testLongIntFloorDivMod(Long.MAX_VALUE - 1L, 3, (Long.MAX_VALUE - 1L) / 3L, 0L);
 291         testLongIntFloorDivMod(Long.MIN_VALUE, 3, Long.MIN_VALUE / 3L - 1L, 1L);
 292         testLongIntFloorDivMod(Long.MIN_VALUE + 1L, 3, Long.MIN_VALUE / 3L - 1L, 2L);
 293         testLongIntFloorDivMod(Long.MIN_VALUE + 1, -1, Long.MAX_VALUE, 0L);
 294         testLongIntFloorDivMod(Long.MAX_VALUE, Integer.MAX_VALUE, 4294967298L, 1);
 295         testLongIntFloorDivMod(Long.MAX_VALUE, Integer.MIN_VALUE, -4294967296L, -1);
 296         testLongIntFloorDivMod(Long.MIN_VALUE, Integer.MIN_VALUE, 4294967296L, 0);
 297         testLongIntFloorDivMod(Long.MIN_VALUE, Integer.MAX_VALUE, -4294967299L, 2147483645);
 298         // Special case of integer overflow
 299         testLongIntFloorDivMod(Long.MIN_VALUE, -1, Long.MIN_VALUE, 0L);
 300     }
 301 
 302     /**
 303      * Test the integer floorDiv and floorMod methods.
 304      * Math and StrictMath are tested and the same results are expected for both.
 305      */
 306     static void testLongIntFloorDivMod(long x, int y, Object divExpected, Object modExpected) {
 307         testLongIntFloorDiv(x, y, divExpected);
 308         testLongIntFloorMod(x, y, modExpected);
 309     }
 310 
 311     /**
 312      * Test FloorDiv with long arguments against expected value.
 313      * The expected value is usually a Long but in some cases  is
 314      * an ArithmeticException.
 315      *
 316      * @param x dividend
 317      * @param y modulus
 318      * @param expected expected value,
 319      */
 320     static void testLongIntFloorDiv(long x, int y, Object expected) {
 321         Object result = doFloorDiv(x, y);
 322         if (!resultEquals(result, expected)) {
 323             fail("FAIL: long Math.floorDiv(%d, %d) = %s; expected %s%n", x, y, result, expected);
 324         }
 325 
 326         Object strict_result = doStrictFloorDiv(x, y);
 327         if (!resultEquals(strict_result, expected)) {
 328             fail("FAIL: long StrictMath.floorDiv(%d, %d) = %s; expected %s%n", x, y, strict_result, expected);
 329         }
 330     }
 331 
 332     /**
 333      * Test FloorMod of long arguments against expected value.
 334      * The expected value is usually a Long but in some cases  is
 335      * an ArithmeticException.
 336      *
 337      * @param x dividend
 338      * @param y modulus
 339      * @param expected expected value
 340      */
 341     static void testLongIntFloorMod(long x, int y, Object expected) {
 342         Object result = doFloorMod(x, y);
 343         if (!resultEquals(result, expected)) {
 344             fail("FAIL: long Math.floorMod(%d, %d) = %s; expected %s%n", x, y, result, expected);
 345         }
 346 
 347         Object strict_result = doStrictFloorMod(x, y);
 348         if (!resultEquals(strict_result, expected)) {
 349             fail("FAIL: long StrictMath.floorMod(%d, %d) = %s; expected %s%n", x, y, strict_result, expected);
 350         }
 351 
 352         try {
 353             // Verify the result against BigDecimal rounding mode.
 354             BigDecimal xD = new BigDecimal(x);
 355             BigDecimal yD = new BigDecimal(y);
 356             BigDecimal resultD = xD.divide(yD, RoundingMode.FLOOR);
 357             resultD = resultD.multiply(yD);
 358             resultD = xD.subtract(resultD);
 359             long fr = resultD.longValue();
 360             if (!result.equals(fr)) {
 361                 fail("FAIL: Long.floorMod(%d, %d) = %d is different than BigDecimal result: %d%n", x, y, result, fr);
 362 
 363             }
 364         } catch (ArithmeticException ae) {
 365             if (y != 0) {
 366                 fail("FAIL: long Math.floorMod(%d, %d); unexpected ArithmeticException from bigdecimal");
 367             }
 368         }
 369     }
 370 
 371     /**
 372      * Invoke floorDiv and return the result or any exception.
 373      * @param x the x value
 374      * @param y the y value
 375      * @return the result Integer or an exception.
 376      */
 377     static Object doFloorDiv(int x, int y) {
 378         try {
 379             return Math.floorDiv(x, y);
 380         } catch (ArithmeticException ae) {
 381             return ae;
 382         }
 383     }
 384 
 385     /**
 386      * Invoke floorDiv and return the result or any exception.
 387      * @param x the x value
 388      * @param y the y value
 389      * @return the result Integer or an exception.
 390      */
 391     static Object doFloorDiv(long x, int y) {
 392         try {
 393             return Math.floorDiv(x, y);
 394         } catch (ArithmeticException ae) {
 395             return ae;
 396         }
 397     }
 398 
 399     /**
 400      * Invoke floorDiv and return the result or any exception.
 401      * @param x the x value
 402      * @param y the y value
 403      * @return the result Integer or an exception.
 404      */
 405     static Object doFloorDiv(long x, long y) {
 406         try {
 407             return Math.floorDiv(x, y);
 408         } catch (ArithmeticException ae) {
 409             return ae;
 410         }
 411     }
 412 
 413     /**
 414      * Invoke floorDiv and return the result or any exception.
 415      * @param x the x value
 416      * @param y the y value
 417      * @return the result Integer or an exception.
 418      */
 419     static Object doFloorMod(int x, int y) {
 420         try {
 421             return Math.floorMod(x, y);
 422         } catch (ArithmeticException ae) {
 423             return ae;
 424         }
 425     }
 426 
 427     /**
 428      * Invoke floorDiv and return the result or any exception.
 429      * @param x the x value
 430      * @param y the y value
 431      * @return the result Integer or an exception.
 432      */
 433     static Object doFloorMod(long x, int y) {
 434         try {
 435             return Math.floorMod(x, y);
 436         } catch (ArithmeticException ae) {
 437             return ae;
 438         }
 439     }
 440 
 441     /**
 442      * Invoke floorDiv and return the result or any exception.
 443      * @param x the x value
 444      * @param y the y value
 445      * @return the result Integer or an exception.
 446      */
 447     static Object doFloorMod(long x, long y) {
 448         try {
 449             return Math.floorMod(x, y);
 450         } catch (ArithmeticException ae) {
 451             return ae;
 452         }
 453     }
 454 
 455     /**
 456      * Invoke floorDiv and return the result or any exception.
 457      * @param x the x value
 458      * @param y the y value
 459      * @return the result Integer or an exception.
 460      */
 461     static Object doStrictFloorDiv(int x, int y) {
 462         try {
 463             return StrictMath.floorDiv(x, y);
 464         } catch (ArithmeticException ae) {
 465             return ae;
 466         }
 467     }
 468 
 469     /**
 470      * Invoke floorDiv and return the result or any exception.
 471      * @param x the x value
 472      * @param y the y value
 473      * @return the result Integer or an exception.
 474      */
 475     static Object doStrictFloorDiv(long x, int y) {
 476         try {
 477             return StrictMath.floorDiv(x, y);
 478         } catch (ArithmeticException ae) {
 479             return ae;
 480         }
 481     }
 482 
 483     /**
 484      * Invoke floorDiv and return the result or any exception.
 485      * @param x the x value
 486      * @param y the y value
 487      * @return the result Integer or an exception.
 488      */
 489     static Object doStrictFloorDiv(long x, long y) {
 490         try {
 491             return StrictMath.floorDiv(x, y);
 492         } catch (ArithmeticException ae) {
 493             return ae;
 494         }
 495     }
 496 
 497     /**
 498      * Invoke floorDiv and return the result or any exception.
 499      * @param x the x value
 500      * @param y the y value
 501      * @return the result Integer or an exception.
 502      */
 503     static Object doStrictFloorMod(int x, int y) {
 504         try {
 505             return StrictMath.floorMod(x, y);
 506         } catch (ArithmeticException ae) {
 507             return ae;
 508         }
 509     }
 510 
 511     /**
 512      * Invoke floorDiv and return the result or any exception.
 513      * @param x the x value
 514      * @param y the y value
 515      * @return the result Integer or an exception.
 516      */
 517     static Object doStrictFloorMod(long x, int y) {
 518         try {
 519             return StrictMath.floorMod(x, y);
 520         } catch (ArithmeticException ae) {
 521             return ae;
 522         }
 523     }
 524 
 525     /**
 526      * Invoke floorDiv and return the result or any exception.
 527      * @param x the x value
 528      * @param y the y value
 529      * @return the result Integer or an exception.
 530      */
 531     static Object doStrictFloorMod(long x, long y) {
 532         try {
 533             return StrictMath.floorMod(x, y);
 534         } catch (ArithmeticException ae) {
 535             return ae;
 536         }
 537     }
 538 
 539     /**
 540      * Returns a boolean by comparing the result and the expected value.
 541      * The equals method is not defined for ArithmeticException but it is
 542      * desirable to have equals return true if the expected and the result
 543      * both threw the same exception (class and message.)
 544      *
 545      * @param result the result from testing the method
 546      * @param expected the expected value
 547      * @return true if the result is equal to the expected values; false otherwise.
 548      */
 549     static boolean resultEquals(Object result, Object expected) {
 550         if (result.getClass() != expected.getClass()) {
 551             fail("FAIL: Result type mismatch, %s; expected: %s%n",
 552                     result.getClass().getName(), expected.getClass().getName());
 553             return false;
 554         }
 555 
 556         if (result.equals(expected)) {
 557             return true;
 558         }
 559         // Handle special case to compare ArithmeticExceptions
 560         if (result instanceof ArithmeticException && expected instanceof ArithmeticException) {
 561             return true;
 562         }
 563         return false;
 564     }
 565 
 566 }