git.gag.com Git - debian/openrocket/blob - core/test/net/sf/openrocket/util/TextUtilTest.java

   1 package net.sf.openrocket.util;
   2
   3 import static java.lang.Math.PI;
   4 import static org.junit.Assert.assertEquals;
   5
   6 import java.util.Random;
   7
   8 import org.junit.Test;
   9
  10 public class TextUtilTest {
  11
  12         @Test
  13         public void testHexString() {
  14                 assertEquals("", TextUtil.hexString(new byte[0]));
  15                 assertEquals("00", TextUtil.hexString(new byte[] { 0x00 }));
  16                 assertEquals("ff", TextUtil.hexString(new byte[] { (byte) 0xff }));
  17
  18                 for (int i = 0; i <= 0xff; i++) {
  19                         assertEquals(String.format("%02x", i), TextUtil.hexString(new byte[] { (byte) i }));
  20                 }
  21
  22                 assertEquals("0f1e2d3c4b5a6978", TextUtil.hexString(new byte[] {
  23                                 0x0f, 0x1e, 0x2d, 0x3c, 0x4b, 0x5a, 0x69, 0x78
  24                 }));
  25
  26                 Random rnd = new Random();
  27                 for (int count = 0; count < 10; count++) {
  28                         int n = rnd.nextInt(100);
  29                         byte[] bytes = new byte[n];
  30                         rnd.nextBytes(bytes);
  31                         StringBuilder sb = new StringBuilder();
  32                         for (byte b : bytes) {
  33                                 sb.append(String.format("%02x", b & 0xFF));
  34                         }
  35                         assertEquals(sb.toString(), TextUtil.hexString(bytes));
  36                 }
  37         }
  38
  39         @Test
  40         public void specialCaseTest() {
  41                 assertEquals("NaN", TextUtil.doubleToString(Double.NaN));
  42                 assertEquals("Inf", TextUtil.doubleToString(Double.POSITIVE_INFINITY));
  43                 assertEquals("-Inf", TextUtil.doubleToString(Double.NEGATIVE_INFINITY));
  44                 assertEquals("0", TextUtil.doubleToString(0.0));
  45                 assertEquals("0", TextUtil.doubleToString(MathUtil.EPSILON / 3));
  46                 assertEquals("0", TextUtil.doubleToString(-MathUtil.EPSILON / 3));
  47         }
  48
  49         @Test
  50         public void longTest() {
  51
  52                 assertEquals("3.1416e-5", TextUtil.doubleToString(PI * 1e-5));
  53                 assertEquals("3.1416e-4", TextUtil.doubleToString(PI * 1e-4));
  54                 assertEquals("0.0031416", TextUtil.doubleToString(PI * 1e-3));
  55                 assertEquals("0.031416", TextUtil.doubleToString(PI * 1e-2));
  56                 assertEquals("0.31416", TextUtil.doubleToString(PI * 1e-1));
  57                 assertEquals("3.1416", TextUtil.doubleToString(PI));
  58                 assertEquals("31.416", TextUtil.doubleToString(PI * 1e1));
  59                 assertEquals("314.16", TextUtil.doubleToString(PI * 1e2));
  60                 assertEquals("3141.6", TextUtil.doubleToString(PI * 1e3));
  61                 assertEquals("31416", TextUtil.doubleToString(PI * 1e4));
  62                 assertEquals("314159", TextUtil.doubleToString(PI * 1e5));
  63                 assertEquals("3141593", TextUtil.doubleToString(PI * 1e6));
  64                 assertEquals("31415927", TextUtil.doubleToString(PI * 1e7));
  65                 assertEquals("3.1416e8", TextUtil.doubleToString(PI * 1e8));
  66                 assertEquals("3.1416e9", TextUtil.doubleToString(PI * 1e9));
  67                 assertEquals("3.1416e10", TextUtil.doubleToString(PI * 1e10));
  68
  69                 assertEquals("-3.1416e-5", TextUtil.doubleToString(-PI * 1e-5));
  70                 assertEquals("-3.1416e-4", TextUtil.doubleToString(-PI * 1e-4));
  71                 assertEquals("-0.0031416", TextUtil.doubleToString(-PI * 1e-3));
  72                 assertEquals("-0.031416", TextUtil.doubleToString(-PI * 1e-2));
  73                 assertEquals("-0.31416", TextUtil.doubleToString(-PI * 1e-1));
  74                 assertEquals("-3.1416", TextUtil.doubleToString(-PI));
  75                 assertEquals("-31.416", TextUtil.doubleToString(-PI * 1e1));
  76                 assertEquals("-314.16", TextUtil.doubleToString(-PI * 1e2));
  77                 assertEquals("-3141.6", TextUtil.doubleToString(-PI * 1e3));
  78                 assertEquals("-31416", TextUtil.doubleToString(-PI * 1e4));
  79                 assertEquals("-314159", TextUtil.doubleToString(-PI * 1e5));
  80                 assertEquals("-3141593", TextUtil.doubleToString(-PI * 1e6));
  81                 assertEquals("-31415927", TextUtil.doubleToString(-PI * 1e7));
  82                 assertEquals("-3.1416e8", TextUtil.doubleToString(-PI * 1e8));
  83                 assertEquals("-3.1416e9", TextUtil.doubleToString(-PI * 1e9));
  84                 assertEquals("-3.1416e10", TextUtil.doubleToString(-PI * 1e10));
  85
  86         }
  87
  88         @Test
  89         public void shortTest() {
  90                 double p = 3.1;
  91                 assertEquals("3.1e-5", TextUtil.doubleToString(p * 1e-5));
  92                 assertEquals("3.1e-4", TextUtil.doubleToString(p * 1e-4));
  93                 assertEquals("0.0031", TextUtil.doubleToString(p * 1e-3));
  94                 assertEquals("0.031", TextUtil.doubleToString(p * 1e-2));
  95                 assertEquals("0.31", TextUtil.doubleToString(p * 1e-1));
  96                 assertEquals("3.1", TextUtil.doubleToString(p));
  97                 assertEquals("31", TextUtil.doubleToString(p * 1e1));
  98                 assertEquals("310", TextUtil.doubleToString(p * 1e2));
  99                 assertEquals("3100", TextUtil.doubleToString(p * 1e3));
 100                 assertEquals("31000", TextUtil.doubleToString(p * 1e4));
 101                 assertEquals("3.1e5", TextUtil.doubleToString(p * 1e5));
 102                 assertEquals("3.1e6", TextUtil.doubleToString(p * 1e6));
 103                 assertEquals("3.1e7", TextUtil.doubleToString(p * 1e7));
 104                 assertEquals("3.1e8", TextUtil.doubleToString(p * 1e8));
 105                 assertEquals("3.1e9", TextUtil.doubleToString(p * 1e9));
 106                 assertEquals("3.1e10", TextUtil.doubleToString(p * 1e10));
 107
 108                 assertEquals("-3.1e-5", TextUtil.doubleToString(-p * 1e-5));
 109                 assertEquals("-3.1e-4", TextUtil.doubleToString(-p * 1e-4));
 110                 assertEquals("-0.0031", TextUtil.doubleToString(-p * 1e-3));
 111                 assertEquals("-0.031", TextUtil.doubleToString(-p * 1e-2));
 112                 assertEquals("-0.31", TextUtil.doubleToString(-p * 1e-1));
 113                 assertEquals("-3.1", TextUtil.doubleToString(-p));
 114                 assertEquals("-31", TextUtil.doubleToString(-p * 1e1));
 115                 assertEquals("-310", TextUtil.doubleToString(-p * 1e2));
 116                 assertEquals("-3100", TextUtil.doubleToString(-p * 1e3));
 117                 assertEquals("-31000", TextUtil.doubleToString(-p * 1e4));
 118                 assertEquals("-3.1e5", TextUtil.doubleToString(-p * 1e5));
 119                 assertEquals("-3.1e6", TextUtil.doubleToString(-p * 1e6));
 120                 assertEquals("-3.1e7", TextUtil.doubleToString(-p * 1e7));
 121                 assertEquals("-3.1e8", TextUtil.doubleToString(-p * 1e8));
 122                 assertEquals("-3.1e9", TextUtil.doubleToString(-p * 1e9));
 123                 assertEquals("-3.1e10", TextUtil.doubleToString(-p * 1e10));
 124
 125                 p = 3;
 126                 assertEquals("3e-5", TextUtil.doubleToString(p * 1e-5));
 127                 assertEquals("3e-4", TextUtil.doubleToString(p * 1e-4));
 128                 assertEquals("3e-3", TextUtil.doubleToString(p * 1e-3));
 129                 assertEquals("0.03", TextUtil.doubleToString(p * 1e-2));
 130                 assertEquals("0.3", TextUtil.doubleToString(p * 1e-1));
 131                 assertEquals("3", TextUtil.doubleToString(p));
 132                 assertEquals("30", TextUtil.doubleToString(p * 1e1));
 133                 assertEquals("300", TextUtil.doubleToString(p * 1e2));
 134                 assertEquals("3e3", TextUtil.doubleToString(p * 1e3));
 135                 assertEquals("3e4", TextUtil.doubleToString(p * 1e4));
 136                 assertEquals("3e5", TextUtil.doubleToString(p * 1e5));
 137                 assertEquals("3e6", TextUtil.doubleToString(p * 1e6));
 138                 assertEquals("3e7", TextUtil.doubleToString(p * 1e7));
 139                 assertEquals("3e8", TextUtil.doubleToString(p * 1e8));
 140                 assertEquals("3e9", TextUtil.doubleToString(p * 1e9));
 141                 assertEquals("3e10", TextUtil.doubleToString(p * 1e10));
 142
 143                 assertEquals("-3e-5", TextUtil.doubleToString(-p * 1e-5));
 144                 assertEquals("-3e-4", TextUtil.doubleToString(-p * 1e-4));
 145                 assertEquals("-3e-3", TextUtil.doubleToString(-p * 1e-3));
 146                 assertEquals("-0.03", TextUtil.doubleToString(-p * 1e-2));
 147                 assertEquals("-0.3", TextUtil.doubleToString(-p * 1e-1));
 148                 assertEquals("-3", TextUtil.doubleToString(-p));
 149                 assertEquals("-30", TextUtil.doubleToString(-p * 1e1));
 150                 assertEquals("-300", TextUtil.doubleToString(-p * 1e2));
 151                 assertEquals("-3e3", TextUtil.doubleToString(-p * 1e3));
 152                 assertEquals("-3e4", TextUtil.doubleToString(-p * 1e4));
 153                 assertEquals("-3e5", TextUtil.doubleToString(-p * 1e5));
 154                 assertEquals("-3e6", TextUtil.doubleToString(-p * 1e6));
 155                 assertEquals("-3e7", TextUtil.doubleToString(-p * 1e7));
 156                 assertEquals("-3e8", TextUtil.doubleToString(-p * 1e8));
 157                 assertEquals("-3e9", TextUtil.doubleToString(-p * 1e9));
 158                 assertEquals("-3e10", TextUtil.doubleToString(-p * 1e10));
 159
 160         }
 161
 162         @Test
 163         public void roundingTest() {
 164
 165                 assertEquals("1.001", TextUtil.doubleToString(1.00096));
 166
 167
 168                 /*
 169                  * Not testing with 1.00015 because it might be changed during number formatting
 170                  * calculations.  Its rounding is basically arbitrary anyway.
 171                  */
 172
 173                 assertEquals("1.0002e-5", TextUtil.doubleToString(1.0001500001e-5));
 174                 assertEquals("1.0001e-5", TextUtil.doubleToString(1.0001499999e-5));
 175                 assertEquals("1.0002e-4", TextUtil.doubleToString(1.0001500001e-4));
 176                 assertEquals("1.0001e-4", TextUtil.doubleToString(1.0001499999e-4));
 177                 assertEquals("0.0010002", TextUtil.doubleToString(1.0001500001e-3));
 178                 assertEquals("0.0010001", TextUtil.doubleToString(1.0001499999e-3));
 179                 assertEquals("0.010002", TextUtil.doubleToString(1.0001500001e-2));
 180                 assertEquals("0.010001", TextUtil.doubleToString(1.0001499999e-2));
 181                 assertEquals("0.10002", TextUtil.doubleToString(1.0001500001e-1));
 182                 assertEquals("0.10001", TextUtil.doubleToString(1.0001499999e-1));
 183                 assertEquals("1.0002", TextUtil.doubleToString(1.0001500001));
 184                 assertEquals("1.0001", TextUtil.doubleToString(1.0001499999));
 185                 assertEquals("10.002", TextUtil.doubleToString(1.0001500001e1));
 186                 assertEquals("10.001", TextUtil.doubleToString(1.0001499999e1));
 187                 assertEquals("100.02", TextUtil.doubleToString(1.0001500001e2));
 188                 assertEquals("100.01", TextUtil.doubleToString(1.0001499999e2));
 189                 assertEquals("1000.2", TextUtil.doubleToString(1.0001500001e3));
 190                 assertEquals("1000.1", TextUtil.doubleToString(1.0001499999e3));
 191                 assertEquals("10002", TextUtil.doubleToString(1.0001500001e4));
 192                 assertEquals("10001", TextUtil.doubleToString(1.0001499999e4));
 193                 assertEquals("100012", TextUtil.doubleToString(1.00011500001e5));
 194                 assertEquals("100011", TextUtil.doubleToString(1.00011499999e5));
 195                 assertEquals("1000112", TextUtil.doubleToString(1.000111500001e6));
 196                 assertEquals("1000111", TextUtil.doubleToString(1.000111499999e6));
 197                 assertEquals("10001112", TextUtil.doubleToString(1.0001111500001e7));
 198                 assertEquals("10001111", TextUtil.doubleToString(1.0001111499999e7));
 199                 assertEquals("1.0002e8", TextUtil.doubleToString(1.0001500001e8));
 200                 assertEquals("1.0001e8", TextUtil.doubleToString(1.0001499999e8));
 201                 assertEquals("1.0002e9", TextUtil.doubleToString(1.0001500001e9));
 202                 assertEquals("1.0001e9", TextUtil.doubleToString(1.0001499999e9));
 203                 assertEquals("1.0002e10", TextUtil.doubleToString(1.0001500001e10));
 204                 assertEquals("1.0001e10", TextUtil.doubleToString(1.0001499999e10));
 205
 206
 207                 assertEquals("-1.0002e-5", TextUtil.doubleToString(-1.0001500001e-5));
 208                 assertEquals("-1.0001e-5", TextUtil.doubleToString(-1.0001499999e-5));
 209                 assertEquals("-1.0002e-4", TextUtil.doubleToString(-1.0001500001e-4));
 210                 assertEquals("-1.0001e-4", TextUtil.doubleToString(-1.0001499999e-4));
 211                 assertEquals("-0.0010002", TextUtil.doubleToString(-1.0001500001e-3));
 212                 assertEquals("-0.0010001", TextUtil.doubleToString(-1.0001499999e-3));
 213                 assertEquals("-0.010002", TextUtil.doubleToString(-1.0001500001e-2));
 214                 assertEquals("-0.010001", TextUtil.doubleToString(-1.0001499999e-2));
 215                 assertEquals("-0.10002", TextUtil.doubleToString(-1.0001500001e-1));
 216                 assertEquals("-0.10001", TextUtil.doubleToString(-1.0001499999e-1));
 217                 assertEquals("-1.0002", TextUtil.doubleToString(-1.0001500001));
 218                 assertEquals("-1.0001", TextUtil.doubleToString(-1.0001499999));
 219                 assertEquals("-10.002", TextUtil.doubleToString(-1.0001500001e1));
 220                 assertEquals("-10.001", TextUtil.doubleToString(-1.0001499999e1));
 221                 assertEquals("-100.02", TextUtil.doubleToString(-1.0001500001e2));
 222                 assertEquals("-100.01", TextUtil.doubleToString(-1.0001499999e2));
 223                 assertEquals("-1000.2", TextUtil.doubleToString(-1.0001500001e3));
 224                 assertEquals("-1000.1", TextUtil.doubleToString(-1.0001499999e3));
 225                 assertEquals("-10002", TextUtil.doubleToString(-1.0001500001e4));
 226                 assertEquals("-10001", TextUtil.doubleToString(-1.0001499999e4));
 227                 assertEquals("-100012", TextUtil.doubleToString(-1.00011500001e5));
 228                 assertEquals("-100011", TextUtil.doubleToString(-1.00011499999e5));
 229                 assertEquals("-1000112", TextUtil.doubleToString(-1.000111500001e6));
 230                 assertEquals("-1000111", TextUtil.doubleToString(-1.000111499999e6));
 231                 assertEquals("-10001112", TextUtil.doubleToString(-1.0001111500001e7));
 232                 assertEquals("-10001111", TextUtil.doubleToString(-1.0001111499999e7));
 233                 assertEquals("-1.0002e8", TextUtil.doubleToString(-1.0001500001e8));
 234                 assertEquals("-1.0001e8", TextUtil.doubleToString(-1.0001499999e8));
 235                 assertEquals("-1.0002e9", TextUtil.doubleToString(-1.0001500001e9));
 236                 assertEquals("-1.0001e9", TextUtil.doubleToString(-1.0001499999e9));
 237                 assertEquals("-1.0002e10", TextUtil.doubleToString(-1.0001500001e10));
 238                 assertEquals("-1.0001e10", TextUtil.doubleToString(-1.0001499999e10));
 239
 240         }
 241
 242
 243         @Test
 244         public void randomTest() {
 245                 for (int i = 0; i < 10000; i++) {
 246                         double orig = Math.random();
 247                         double result;
 248                         double expected = Math.rint(orig * 100000) / 100000.0;
 249
 250                         if (orig < 0.1)
 251                                 continue;
 252                         String s = TextUtil.doubleToString(orig);
 253                         result = Double.parseDouble(s);
 254                         assertEquals(expected, result, 0.00000001);
 255                 }
 256         }
 257
 258 }