class/System.Numerics/Test/System.Numerics/BigIntegerTest.cs

   1 // BigIntegerTest.cs
   2 //
   3 // Authors:
   4 // Rodrigo Kumpera <rkumpera@novell.com>
   5 //
   6 // Copyright (C) 2010 Novell, Inc (http://www.novell.com)
   7 //
   8
   9 using System;
  10 using System.Numerics;
  11 using NUnit.Framework;
  12
  13
  14 namespace MonoTests.System.Numerics
  15 {
  16         [TestFixture]
  17         public class BigIntegerTest
  18         {
  19                 static byte[] huge_a = new byte[] {0x1D, 0x33, 0xFB, 0xFE, 0xB1, 0x2, 0x85, 0x44, 0xCA, 0xDC, 0xFB, 0x70, 0xD, 0x39, 0xB1, 0x47, 0xB6, 0xE6, 0xA2, 0xD1, 0x19, 0x1E, 0x9F, 0xE4, 0x3C, 0x1E, 0x16, 0x56, 0x13, 0x9C, 0x4D, 0xD3, 0x5C, 0x74, 0xC9, 0xBD, 0xFA, 0x56, 0x40, 0x58, 0xAC, 0x20, 0x6B, 0x55, 0xA2, 0xD5, 0x41, 0x38, 0xA4, 0x6D, 0xF6, 0x8C, };
  20
  21                 static byte[] huge_b = new byte[] {0x96, 0x5, 0xDA, 0xFE, 0x93, 0x17, 0xC1, 0x93, 0xEC, 0x2F, 0x30, 0x2D, 0x8F, 0x28, 0x13, 0x99, 0x70, 0xF4, 0x4C, 0x60, 0xA6, 0x49, 0x24, 0xF9, 0xB3, 0x4A, 0x41, 0x67, 0xDC, 0xDD, 0xB1, 0xA5, 0xA6, 0xC0, 0x3D, 0x57, 0x9A, 0xCB, 0x29, 0xE2, 0x94, 0xAC, 0x6C, 0x7D, 0xEF, 0x3E, 0xC6, 0x7A, 0xC1, 0xA8, 0xC8, 0xB0, 0x20, 0x95, 0xE6, 0x4C, 0xE1, 0xE0, 0x4B, 0x49, 0xD5, 0x5A, 0xB7, };
  22
  23                 static byte[] huge_add = new byte[] {0xB3, 0x38, 0xD5, 0xFD, 0x45, 0x1A, 0x46, 0xD8, 0xB6, 0xC, 0x2C, 0x9E, 0x9C, 0x61, 0xC4, 0xE0, 0x26, 0xDB, 0xEF, 0x31, 0xC0, 0x67, 0xC3, 0xDD, 0xF0, 0x68, 0x57, 0xBD, 0xEF, 0x79, 0xFF, 0x78, 0x3, 0x35, 0x7, 0x15, 0x95, 0x22, 0x6A, 0x3A, 0x41, 0xCD, 0xD7, 0xD2, 0x91, 0x14, 0x8, 0xB3, 0x65, 0x16, 0xBF, 0x3D, 0x20, 0x95, 0xE6, 0x4C, 0xE1, 0xE0, 0x4B, 0x49, 0xD5, 0x5A, 0xB7, };
  24
  25                 static byte[] a_m_b = new byte[] { 0x87, 0x2D, 0x21, 0x0, 0x1E, 0xEB, 0xC3, 0xB0, 0xDD, 0xAC, 0xCB, 0x43, 0x7E, 0x10, 0x9E, 0xAE, 0x45, 0xF2, 0x55, 0x71, 0x73, 0xD4, 0x7A, 0xEB, 0x88, 0xD3, 0xD4, 0xEE, 0x36, 0xBE, 0x9B, 0x2D, 0xB6, 0xB3, 0x8B, 0x66, 0x60, 0x8B, 0x16, 0x76, 0x17, 0x74, 0xFE, 0xD7, 0xB2, 0x96, 0x7B, 0xBD, 0xE2, 0xC4, 0x2D, 0xDC, 0xDE, 0x6A, 0x19, 0xB3, 0x1E, 0x1F, 0xB4, 0xB6, 0x2A, 0xA5, 0x48, };
  26                 static byte[] b_m_a = new byte[] { 0x79, 0xD2, 0xDE, 0xFF, 0xE1, 0x14, 0x3C, 0x4F, 0x22, 0x53, 0x34, 0xBC, 0x81, 0xEF, 0x61, 0x51, 0xBA, 0xD, 0xAA, 0x8E, 0x8C, 0x2B, 0x85, 0x14, 0x77, 0x2C, 0x2B, 0x11, 0xC9, 0x41, 0x64, 0xD2, 0x49, 0x4C, 0x74, 0x99, 0x9F, 0x74, 0xE9, 0x89, 0xE8, 0x8B, 0x1, 0x28, 0x4D, 0x69, 0x84, 0x42, 0x1D, 0x3B, 0xD2, 0x23, 0x21, 0x95, 0xE6, 0x4C, 0xE1, 0xE0, 0x4B, 0x49, 0xD5, 0x5A, 0xB7, };
  27
  28                 static byte[][] add_a = new byte[][] {
  29                         new byte[] {1},
  30                         new byte[] {0xFF},
  31                         huge_a
  32                 };
  33
  34                 static byte[][] add_b = new byte[][] {
  35                         new byte[] {1},
  36                         new byte[] {1},
  37                         huge_b
  38                 };
  39
  40                 static byte[][] add_c = new byte[][] {
  41                         new byte[] {2},
  42                         new byte[] {0},
  43                         huge_add
  44                 };
  45
  46                 [Test]
  47                 public void TestAdd () {
  48                         for (int i = 0; i < add_a.Length; ++i) {
  49                                 var a = new BigInteger (add_a [i]);
  50                                 var b = new BigInteger (add_b [i]);
  51                                 var c = new BigInteger (add_c [i]);
  52
  53                                 Assert.AreEqual (c, a + b, "#" + i + "a");
  54                                 Assert.AreEqual (c, b + a, "#" + i + "b");
  55                                 Assert.AreEqual (c, BigInteger.Add (a, b), "#" + i + "c");
  56                                 Assert.AreEqual (add_c [i], (a + b).ToByteArray (), "#" + i + "d");
  57                         }
  58                 }
  59
  60                 [Test]
  61                 public void TestAdd2 () {
  62                         long[] values = new long [] { -100000000000L, -1000, -1, 0, 1, 1000, 100000000000L };
  63                         for (int i = 0; i < values.Length; ++i) {
  64                                 for (int j = 0; j < values.Length; ++j) {
  65                                         var a = new BigInteger (values [i]);
  66                                         var b = new BigInteger (values [j]);
  67                                         var c = a + b;
  68                                         Assert.AreEqual (values [i] + values [j], (long)c, "#_" + i + "_" + j);
  69                                 }
  70                         }
  71                 }
  72
  73                 [Test]
  74                 public void TestHugeSub () {
  75                         var a = new BigInteger (huge_a);
  76                         var b = new BigInteger (huge_b);
  77                         Assert.AreEqual (a_m_b, (a - b).ToByteArray (), "#1");
  78                         Assert.AreEqual (b_m_a, (b - a).ToByteArray (), "#2");
  79                 }
  80
  81                 [Test]
  82                 public void TestSub () {
  83                         long[] values = new long [] { -100000000000L, -1000, -1, 0, 1, 1000, 100000000000L };
  84                         for (int i = 0; i < values.Length; ++i) {
  85                                 for (int j = 0; j < values.Length; ++j) {
  86                                         var a = new BigInteger (values [i]);
  87                                         var b = new BigInteger (values [j]);
  88                                         var c = a - b;
  89                                         var d = BigInteger.Subtract (a, b);
  90
  91                                         Assert.AreEqual (values [i] - values [j], (long)c, "#_" + i + "_" + j);
  92                                         Assert.AreEqual (values [i] - values [j], (long)d, "#_" + i + "_" + j);
  93                                 }
  94                         }
  95                 }
  96
  97                 [Test]
  98                 public void TestMin () {
  99                         long[] values = new long [] { -100000000000L, -1000, -1, 0, 1, 1000, 100000000000L };
 100                         for (int i = 0; i < values.Length; ++i) {
 101                                 for (int j = 0; j < values.Length; ++j) {
 102                                         var a = new BigInteger (values [i]);
 103                                         var b = new BigInteger (values [j]);
 104                                         var c = BigInteger.Min (a, b);
 105
 106                                         Assert.AreEqual (Math.Min (values [i], values [j]), (long)c, "#_" + i + "_" + j);
 107                                 }
 108                         }
 109                 }
 110
 111                 [Test]
 112                 public void TestMax () {
 113                         long[] values = new long [] { -100000000000L, -1000, -1, 0, 1, 1000, 100000000000L };
 114                         for (int i = 0; i < values.Length; ++i) {
 115                                 for (int j = 0; j < values.Length; ++j) {
 116                                         var a = new BigInteger (values [i]);
 117                                         var b = new BigInteger (values [j]);
 118                                         var c = BigInteger.Max (a, b);
 119
 120                                         Assert.AreEqual (Math.Max (values [i], values [j]), (long)c, "#_" + i + "_" + j);
 121                                 }
 122                         }
 123                 }
 124
 125                 [Test]
 126                 public void TestAbs () {
 127                         long[] values = new long [] { -100000000000L, -1000, -1, 0, 1, 1000, 100000000000L };
 128                         for (int i = 0; i < values.Length; ++i) {
 129                                 var a = new BigInteger (values [i]);
 130                                 var c = BigInteger.Abs (a);
 131
 132                                 Assert.AreEqual (Math.Abs (values [i]), (long)c, "#_" + i);
 133                         }
 134                 }
 135
 136                 [Test]
 137                 public void TestNegate () {
 138                         long[] values = new long [] { -100000000000L, -1000, -1, 0, 1, 1000, 100000000000L };
 139                         for (int i = 0; i < values.Length; ++i) {
 140                                 var a = new BigInteger (values [i]);
 141                                 var c = -a;
 142                                 var d = BigInteger.Negate (a);
 143
 144                                 Assert.AreEqual (-values [i], (long)c, "#_" + i);
 145                                 Assert.AreEqual (-values [i], (long)d, "#_" + i);
 146                         }
 147                 }
 148
 149                 [Test]
 150                 public void CompareOps () {
 151                         long[] values = new long [] { -100000000000L, -1000, -1, 0, 1, 1000, 100000000000L };
 152                         for (int i = 0; i < values.Length; ++i) {
 153                                 for (int j = 0; j < values.Length; ++j) {
 154                                         var a = new BigInteger (values [i]);
 155                                         var b = new BigInteger (values [j]);
 156
 157                                         Assert.AreEqual (values [i].CompareTo (values [j]), a.CompareTo (b), "#a_" + i + "_" + j);
 158                                         Assert.AreEqual (values [i].CompareTo (values [j]), BigInteger.Compare (a, b), "#b_" + i + "_" + j);
 159
 160                                         Assert.AreEqual (values [i] < values [j], a < b, "#c_" + i + "_" + j);
 161                                         Assert.AreEqual (values [i] <= values [j], a <= b, "#d_" + i + "_" + j);
 162                                         Assert.AreEqual (values [i] == values [j], a == b, "#e_" + i + "_" + j);
 163                                         Assert.AreEqual (values [i] != values [j], a != b, "#f_" + i + "_" + j);
 164                                         Assert.AreEqual (values [i] >= values [j], a >= b, "#g_" + i + "_" + j);
 165                                         Assert.AreEqual (values [i] > values [j], a > b, "#h_" + i + "_" + j);
 166                                 }
 167                         }
 168                 }
 169
 170                 [Test]
 171                 public void CompareOps2 () {
 172                         BigInteger a = new BigInteger (100000000000L);
 173                         BigInteger b = new BigInteger (28282828282UL);
 174
 175                         Assert.IsTrue (a >= b, "#1");
 176                         Assert.IsTrue (a >= b, "#2");
 177                         Assert.IsFalse (a < b, "#3");
 178                         Assert.IsFalse (a <= b, "#4");
 179                         Assert.AreEqual (1, a.CompareTo (b), "#5");
 180                 }
 181
 182                 [Test]
 183                 public void CompareULong () {
 184                         long[] values = new long [] { -100000000000L, -1000, -1, 0, 1, 1000, 100000000000L, 0xAA00000000L };
 185                         ulong[] uvalues = new ulong [] {0, 1, 1000, 100000000000L, 999999, 28282828282, 0xAA00000000, ulong.MaxValue };
 186                         for (int i = 0; i < values.Length; ++i) {
 187                                 for (int j = 0; j < uvalues.Length; ++j) {
 188                                         var a = new BigInteger (values [i]);
 189                                         var b = uvalues [j];
 190                                         var c = new BigInteger (b);
 191
 192                                         Assert.AreEqual (a.CompareTo (c), a.CompareTo (b), "#a_" + i + "_" + j);
 193
 194                                         Assert.AreEqual (a > c, a > b, "#b_" + i + "_" + j);
 195                                         Assert.AreEqual (a < c, a < b, "#c_" + i + "_" + j);
 196                                         Assert.AreEqual (a <= c, a <= b, "#d_" + i + "_" + j);
 197                                         Assert.AreEqual (a == c, a == b, "#e_" + i + "_" + j);
 198                                         Assert.AreEqual (a != c, a != b, "#f_" + i + "_" + j);
 199                                         Assert.AreEqual (a >= c, a >= b, "#g_" + i + "_" + j);
 200
 201                                         Assert.AreEqual (c > a, b > a, "#ib_" + i + "_" + j);
 202                                         Assert.AreEqual (c < a, b < a, "#ic_" + i + "_" + j);
 203                                         Assert.AreEqual (c <= a, b <= a, "#id_" + i + "_" + j);
 204                                         Assert.AreEqual (c == a, b == a, "#ie_" + i + "_" + j);
 205                                         Assert.AreEqual (c != a, b != a, "#if_" + i + "_" + j);
 206                                         Assert.AreEqual (c >= a, b >= a, "#ig_" + i + "_" + j);
 207                                 }
 208                         }
 209                 }
 210
 211                 [Test]
 212                 public void CompareLong () {
 213                         long[] values = new long [] { -100000000000L, -1000, -1, 0, 1, 1000, 9999999, 100000000000L, 0xAA00000000, long.MaxValue, long.MinValue };
 214
 215                         for (int i = 0; i < values.Length; ++i) {
 216                                 for (int j = 0; j < values.Length; ++j) {
 217                                         var a = new BigInteger (values [i]);
 218                                         var b = values [j];
 219                                         var c = new BigInteger (b);
 220
 221                                         Assert.AreEqual (a.CompareTo (c), a.CompareTo (b), "#a_" + i + "_" + j);
 222
 223                                         Assert.AreEqual (a > c, a > b, "#b_" + i + "_" + j);
 224                                         Assert.AreEqual (a < c, a < b, "#c_" + i + "_" + j);
 225                                         Assert.AreEqual (a <= c, a <= b, "#d_" + i + "_" + j);
 226                                         Assert.AreEqual (a == c, a == b, "#e_" + i + "_" + j);
 227                                         Assert.AreEqual (a != c, a != b, "#f_" + i + "_" + j);
 228                                         Assert.AreEqual (a >= c, a >= b, "#g_" + i + "_" + j);
 229
 230                                         Assert.AreEqual (c > a, b > a, "#ib_" + i + "_" + j);
 231                                         Assert.AreEqual (c < a, b < a, "#ic_" + i + "_" + j);
 232                                         Assert.AreEqual (c <= a, b <= a, "#id_" + i + "_" + j);
 233                                         Assert.AreEqual (c == a, b == a, "#ie_" + i + "_" + j);
 234                                         Assert.AreEqual (c != a, b != a, "#if_" + i + "_" + j);
 235                                         Assert.AreEqual (c >= a, b >= a, "#ig_" + i + "_" + j);
 236                                 }
 237                         }
 238                 }
 239
 240                 [Test]
 241                 public void TestEquals () {
 242                                 var a = new BigInteger (10);
 243                                 var b = new BigInteger (10);
 244                                 var c = new BigInteger (-10);
 245
 246                                 Assert.AreEqual (a, b, "#1");
 247                                 Assert.AreNotEqual (a, c, "#2");
 248                                 Assert.AreNotEqual (a, 10, "#3");
 249                 }
 250
 251                 [Test]
 252                 public void ByteArrayCtor ()
 253                 {
 254                         try {
 255                                 new BigInteger (null);
 256                                 Assert.Fail ("#1");
 257                         } catch (ArgumentNullException) {}
 258
 259                         Assert.AreEqual (0, (int)new BigInteger (new byte [0]), "#2");
 260                 }
 261
 262                 [Test]
 263                 public void IntCtorRoundTrip ()
 264                 {
 265                         int[] values = new int [] {
 266                                 int.MinValue, -0x2F33BB, -0x1F33, -0x33, 0, 0x33,
 267                                 0x80, 0x8190, 0xFF0011, 0x1234, 0x11BB99, 0x44BB22CC,
 268                                 int.MaxValue };
 269                         foreach (var val in values) {
 270                                 var a = new BigInteger (val);
 271                                 var b = new BigInteger (a.ToByteArray ());
 272
 273                                 Assert.AreEqual (val, (int)a, "#a_" + val);
 274                                 Assert.AreEqual (val, (int)b, "#b_" + val);
 275                         }
 276                 }
 277
 278                 [Test]
 279                 public void LongCtorRoundTrip ()
 280                 {
 281                         long[] values = new long [] {
 282                                 0, long.MinValue, long.MaxValue, -1, 1L + int.MaxValue, -1L + int.MinValue, 0x1234, 0xFFFFFFFFL, 0x1FFFFFFFFL, -0xFFFFFFFFL, -0x1FFFFFFFFL,
 283                                 0x100000000L, -0x100000000L, 0x100000001L, -0x100000001L };
 284                         foreach (var val in values) {
 285                                 var a = new BigInteger (val);
 286                                 var b = new BigInteger (a.ToByteArray ());
 287
 288                                 Assert.AreEqual (val, (long)a, "#a_" + val);
 289                                 Assert.AreEqual (val, (long)b, "#b_" + val);
 290                         }
 291                 }
 292
 293                 [Test]
 294                 public void ByteArrayCtorRoundTrip ()
 295                 {
 296                         var arr = new byte [] { 1,2,3,4,5,6,7,8,9 };
 297                         Assert.AreEqual (arr, new BigInteger (arr).ToByteArray (), "#1");
 298
 299                         arr = new byte [] { 1,2,3,4,5,6,7,8,0xFF, 0x0};
 300                         Assert.AreEqual (arr, new BigInteger (arr).ToByteArray (), "#2");
 301
 302                         arr = new byte [] { 1,2,3,4,5,6,7,8,9, 0xF0 };
 303                         Assert.AreEqual (arr, new BigInteger (arr).ToByteArray (), "#3");
 304
 305                         arr = new byte [] { 1};
 306                         Assert.AreEqual (arr, new BigInteger (arr).ToByteArray (), "#4");
 307
 308                         arr = new byte [] { 1,2 };
 309                         Assert.AreEqual (arr, new BigInteger (arr).ToByteArray (), "#5");
 310
 311                         arr = new byte [] { 1,2,3 };
 312                         Assert.AreEqual (arr, new BigInteger (arr).ToByteArray (), "#6");
 313
 314                         arr = new byte [] { 1,2,3,4 };
 315                         Assert.AreEqual (arr, new BigInteger (arr).ToByteArray (), "#7");
 316
 317                         arr = new byte [] { 1,2,3,4,5 };
 318                         Assert.AreEqual (arr, new BigInteger (arr).ToByteArray (), "#8");
 319
 320                         arr = new byte [] { 1,2,3,4,5,6 };
 321                         Assert.AreEqual (arr, new BigInteger (arr).ToByteArray (), "#9");
 322
 323                         arr = new byte [] { 1,2,3,4,5,6,7 };
 324                         Assert.AreEqual (arr, new BigInteger (arr).ToByteArray (), "#10");
 325
 326                         arr = new byte [] { 1,2,3,4,5 };
 327                         Assert.AreEqual (arr, new BigInteger (arr).ToByteArray (), "#11");
 328
 329                         arr = new byte [] { 0 };
 330                         Assert.AreEqual (arr, new BigInteger (arr).ToByteArray (), "#12");
 331
 332                         arr = new byte [] { 0xFF, 00 };
 333                         Assert.AreEqual (arr, new BigInteger (arr).ToByteArray (), "#13");
 334
 335                         arr = new byte [] { 1, 0, 0, 0, 0, 0, };
 336                         Assert.AreEqual (new byte [1] {1}, new BigInteger (arr).ToByteArray (), "#14");
 337                 }
 338
 339                 [Test]
 340                 public void TestIntCtorProperties ()
 341                 {
 342                         BigInteger a = new BigInteger (10);
 343                         Assert.IsTrue (a.IsEven, "#1");
 344                         Assert.IsFalse (a.IsOne, "#2");
 345                         Assert.IsFalse (a.IsPowerOfTwo, "#3");
 346                         Assert.IsFalse (a.IsZero, "#4");
 347                         Assert.AreEqual (1, a.Sign, "#5");
 348
 349                         Assert.IsFalse (new BigInteger (11).IsEven, "#6");
 350                         Assert.IsTrue (new BigInteger (1).IsOne, "#7");
 351                         Assert.IsTrue (new BigInteger (32).IsPowerOfTwo, "#8");
 352                         Assert.IsTrue (new BigInteger (0).IsZero, "#9");
 353                         Assert.AreEqual (0, new BigInteger (0).Sign, "#10");
 354                         Assert.AreEqual (-1, new BigInteger (-99999).Sign, "#11");
 355
 356                         Assert.IsFalse (new BigInteger (0).IsPowerOfTwo, "#12");
 357                         Assert.IsFalse (new BigInteger (-16).IsPowerOfTwo, "#13");
 358                         Assert.IsTrue (new BigInteger (1).IsPowerOfTwo, "#14");
 359                 }
 360
 361                 /*[Test]
 362                 public void TestIntCtorToString ()
 363                 {
 364                         Assert.AreEqual ("5555", new BigInteger (5555).ToString (), "#1");
 365                         Assert.AreEqual ("-99999", new BigInteger (-99999).ToString (), "#2");
 366                 }*/
 367
 368                 [Test]
 369                 public void TestToIntOperator ()
 370                 {
 371                         try {
 372                                 int v = (int)new BigInteger (huge_a);
 373                                 Assert.Fail ("#1");
 374                         } catch (OverflowException) {}
 375
 376                         try {
 377                                 int v = (int)new BigInteger (1L + int.MaxValue);
 378                                 Assert.Fail ("#2");
 379                         } catch (OverflowException) {}
 380
 381                         try {
 382                                 int v = (int)new BigInteger (-1L + int.MinValue);
 383                                 Assert.Fail ("#3");
 384                         } catch (OverflowException) {}
 385
 386                         Assert.AreEqual (int.MaxValue, (int)new BigInteger (int.MaxValue), "#4");
 387                         Assert.AreEqual (int.MinValue, (int)new BigInteger (int.MinValue), "#5");
 388                 }
 389
 390
 391                 [Test]
 392                 public void TestToLongOperator ()
 393                 {
 394                         try {
 395                                 long v = (long)new BigInteger (huge_a);
 396                                 Assert.Fail ("#1");
 397                         } catch (OverflowException) {}
 398
 399                         //long.MaxValue + 1
 400                         try {
 401                                 long v = (long)new BigInteger (new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x00 });
 402                                 Assert.Fail ("#2");
 403                         } catch (OverflowException) {}
 404
 405                         //TODO long.MinValue - 1
 406                         try {
 407                                 long v = (long)new BigInteger (new byte[] { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x7F, 0xFF });
 408                                 Assert.Fail ("#3");
 409                         } catch (OverflowException) {}
 410
 411                         Assert.AreEqual (long.MaxValue, (long)new BigInteger (long.MaxValue), "#4");
 412                         Assert.AreEqual (long.MinValue, (long)new BigInteger (long.MinValue), "#5");
 413                 }
 414
 415                 [Test]
 416                 public void TestIntCtorToByteArray ()
 417                 {
 418                         Assert.AreEqual (new byte[] { 0xFF }, new BigInteger (-1).ToByteArray (), "#1");
 419                         Assert.AreEqual (new byte[] { 0xD4, 0xFE }, new BigInteger (-300).ToByteArray (), "#2");
 420                         Assert.AreEqual (new byte[] { 0x80, 0x00 }, new BigInteger (128).ToByteArray (), "#3");
 421                         Assert.AreEqual (new byte[] { 0x00, 0x60 }, new BigInteger (0x6000).ToByteArray (), "#4");
 422                         Assert.AreEqual (new byte[] { 0x00, 0x80, 0x00 }, new BigInteger (0x8000).ToByteArray (), "#5");
 423                         Assert.AreEqual (new byte[] { 0xDD, 0xBC, 0x00, 0x7A }, new BigInteger (0x7A00BCDD).ToByteArray (), "#6");
 424                         Assert.AreEqual (new byte[] { 0xFF, 0xFF, 0xFF, 0x7F }, new BigInteger (int.MaxValue).ToByteArray (), "#7");
 425                         Assert.AreEqual (new byte[] { 0x00, 0x00, 0x00, 0x80 }, new BigInteger (int.MinValue).ToByteArray (), "#8");
 426                         Assert.AreEqual (new byte[] { 0x01, 0x00, 0x00, 0x80 }, new BigInteger (int.MinValue + 1).ToByteArray (), "#9");
 427                         Assert.AreEqual (new byte[] { 0x7F }, new BigInteger (0x7F).ToByteArray (), "#10");
 428                         Assert.AreEqual (new byte[] { 0x45, 0xCC, 0xD0 }, new BigInteger (-0x2F33BB).ToByteArray (), "#11");
 429                         Assert.AreEqual (new byte[] { 0 }, new BigInteger (0).ToByteArray (), "#12");
 430                 }
 431
 432                 [Test]
 433                 public void TestLongCtorToByteArray ()
 434                 {
 435                         Assert.AreEqual (new byte[] { 0x01 }, new BigInteger (0x01L).ToByteArray (), "#1");
 436                         Assert.AreEqual (new byte[] { 0x02, 0x01 }, new BigInteger (0x0102L).ToByteArray (), "#2");
 437                         Assert.AreEqual (new byte[] { 0x03, 0x02, 0x01 }, new BigInteger (0x010203L).ToByteArray (), "#3");
 438                         Assert.AreEqual (new byte[] { 0x04, 0x03, 0x2, 0x01 }, new BigInteger (0x01020304L).ToByteArray (), "#4");
 439                         Assert.AreEqual (new byte[] { 0x05, 0x04, 0x03, 0x2, 0x01 }, new BigInteger (0x0102030405L).ToByteArray (), "#5");
 440                         Assert.AreEqual (new byte[] { 0x06, 0x05, 0x04, 0x03, 0x2, 0x01 }, new BigInteger (0x010203040506L).ToByteArray (), "#6");
 441                         Assert.AreEqual (new byte[] { 0x07, 0x06, 0x05, 0x04, 0x03, 0x2, 0x01 }, new BigInteger (0x01020304050607L).ToByteArray (), "#7");
 442                         Assert.AreEqual (new byte[] { 0x08, 0x07, 0x06, 0x05, 0x04, 0x03, 0x2, 0x01 }, new BigInteger (0x0102030405060708L).ToByteArray (), "#8");
 443
 444                         Assert.AreEqual (new byte[] { 0xFF }, new BigInteger (-0x01L).ToByteArray (), "#1m");
 445                         Assert.AreEqual (new byte[] { 0xFE, 0xFE}, new BigInteger (-0x0102L).ToByteArray (), "#2m");
 446                         Assert.AreEqual (new byte[] { 0xFD, 0xFD, 0xFE }, new BigInteger (-0x010203L).ToByteArray (), "#3m");
 447                         Assert.AreEqual (new byte[] { 0xFC, 0xFC, 0xFD, 0xFE}, new BigInteger (-0x01020304L).ToByteArray (), "#4m");
 448                         Assert.AreEqual (new byte[] { 0xFB, 0xFB, 0xFC, 0xFD, 0xFE }, new BigInteger (-0x0102030405L).ToByteArray (), "#5m");
 449                         Assert.AreEqual (new byte[] { 0xFA, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE }, new BigInteger (-0x010203040506L).ToByteArray (), "#6m");
 450                         Assert.AreEqual (new byte[] { 0xF9, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE }, new BigInteger (-0x01020304050607L).ToByteArray (), "#7m");
 451                         Assert.AreEqual (new byte[] { 0xF8, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE }, new BigInteger (-0x0102030405060708L).ToByteArray (), "#8m");
 452
 453
 454                         Assert.AreEqual (new byte[] { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x7F }, new BigInteger (long.MaxValue).ToByteArray (), "#9");
 455                         Assert.AreEqual (new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80 }, new BigInteger (long.MinValue).ToByteArray (), "#10");
 456
 457                         Assert.AreEqual (new byte[] { 0xFF, 0xFF, 0xFF, 0x7F, 0xFF }, new BigInteger (-2147483649L).ToByteArray (), "11");
 458
 459
 460                 }
 461
 462                 [Test]
 463                 public void IComparable () {
 464                         var a = new BigInteger (99);
 465                         Assert.AreEqual (-1, a.CompareTo (100), "#1");
 466                         Assert.AreEqual (1, a.CompareTo (null), "#2");
 467                 }
 468         }
 469 }