/** test reseeding, algorithm/provider games */
@Test
public void testConfig() {
randomData.reSeed(1000);
double v = randomData.nextUniform(0, 1);
randomData.reSeed();
Assert.assertTrue("different seeds", Math.abs(v - randomData.nextUniform(0, 1)) > 10E-12);
randomData.reSeed(1000);
Assert.assertEquals("same seeds", v, randomData.nextUniform(0, 1), 10E-12);
randomData.reSeedSecure(1000);
String hex = randomData.nextSecureHexString(40);
randomData.reSeedSecure();
Assert.assertTrue("different seeds", !hex.equals(randomData.nextSecureHexString(40)));
randomData.reSeedSecure(1000);
Assert.assertTrue("same seeds", !hex.equals(randomData.nextSecureHexString(40)));
/*
* remove this test back soon, since it takes about 4 seconds
*
* try { randomData.setSecureAlgorithm("SHA1PRNG","SUN"); } catch
* (NoSuchProviderException ex) { ; } Assert.assertTrue("different seeds",
* !hex.equals(randomData.nextSecureHexString(40))); try {
* randomData.setSecureAlgorithm("NOSUCHTHING","SUN");
* Assert.fail("expecting NoSuchAlgorithmException"); } catch
* (NoSuchProviderException ex) { ; } catch (NoSuchAlgorithmException
* ex) { ; }
*
* try { randomData.setSecureAlgorithm("SHA1PRNG","NOSUCHPROVIDER");
* Assert.fail("expecting NoSuchProviderException"); } catch
* (NoSuchProviderException ex) { ; }
*/
// test reseeding without first using the generators
RandomDataGenerator rd = new RandomDataGenerator();
rd.reSeed(100);
rd.nextLong(1, 2);
RandomDataGenerator rd2 = new RandomDataGenerator();
rd2.reSeedSecure(2000);
rd2.nextSecureLong(1, 2);
rd = new RandomDataGenerator();
rd.reSeed();
rd.nextLong(1, 2);
rd2 = new RandomDataGenerator();
rd2.reSeedSecure();
rd2.nextSecureLong(1, 2);
}
@Test
public void testNextLongIAE() {
try {
randomData.nextLong(4, 3);
Assert.fail("MathIllegalArgumentException expected");
} catch (MathIllegalArgumentException ex) {
// ignored
}
}
@Test
public void testNextLongWideRange() {
long lower = -0x6543210FEDCBA987L;
long upper = 0x456789ABCDEF0123L;
long max = Long.MIN_VALUE;
long min = Long.MAX_VALUE;
for (int i = 0; i < 10000000; ++i) {
long r = randomData.nextLong(lower, upper);
max = FastMath.max(max, r);
min = FastMath.min(min, r);
Assert.assertTrue(r >= lower);
Assert.assertTrue(r <= upper);
}
double ratio = (((double) max) - ((double) min)) / (((double) upper) - ((double) lower));
Assert.assertTrue(ratio > 0.99999);
}
private void checkNextLongUniform(long min, long max) {
final Frequency freq = new Frequency();
for (int i = 0; i < smallSampleSize; i++) {
final long value = randomData.nextLong(min, max);
Assert.assertTrue(
"nextLong range: " + value + " " + min + " " + max, (value >= min) && (value <= max));
freq.addValue(value);
}
final int len = ((int) (max - min)) + 1;
final long[] observed = new long[len];
for (int i = 0; i < len; i++) {
observed[i] = freq.getCount(min + i);
}
final double[] expected = new double[len];
for (int i = 0; i < len; i++) {
expected[i] = 1d / len;
}
TestUtils.assertChiSquareAccept(expected, observed, 0.01);
}
@Test
public void testNextLongExtremeValues() {
long x = randomData.nextLong(Long.MIN_VALUE, Long.MAX_VALUE);
long y = randomData.nextLong(Long.MIN_VALUE, Long.MAX_VALUE);
Assert.assertFalse(x == y);
}
