@Test
public void testNextIntIAE() {
try {
randomData.nextInt(4, 3);
Assert.fail("MathIllegalArgumentException expected");
} catch (MathIllegalArgumentException ex) {
// ignored
}
}
@Test
public void testNextIntWideRange() {
int lower = -0x6543210F;
int upper = 0x456789AB;
int max = Integer.MIN_VALUE;
int min = Integer.MAX_VALUE;
for (int i = 0; i < 1000000; ++i) {
int r = randomData.nextInt(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 checkNextIntUniform(int min, int max) {
final Frequency freq = new Frequency();
for (int i = 0; i < smallSampleSize; i++) {
final int value = randomData.nextInt(min, max);
Assert.assertTrue("nextInt range", (value >= min) && (value <= max));
freq.addValue(value);
}
final int len = 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, 0.001);
}
@Test
public void testNextIntExtremeValues() {
int x = randomData.nextInt(Integer.MIN_VALUE, Integer.MAX_VALUE);
int y = randomData.nextInt(Integer.MIN_VALUE, Integer.MAX_VALUE);
Assert.assertFalse(x == y);
}
