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//
// System.Random Test Cases
//
// Authors:
// Bob Smith <bob@thestuff.net>
// Sebastien Pouliot <sebastien@ximian.com>
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using NUnit.Framework;
using System;
namespace MonoTests.System {
[TestFixture]
public class RandomTest {
#if false
//
// This test will fail, given enough runs.
//
// It is an ad-hoc test for distribution, and does not work
// 100% of the time.
//
[Test]
public void NextDouble ()
{
Random r = new Random ();
int i;
double c=0;
for (i=0; i<20; i++)
c += r.NextDouble ();
c/=i;
Assert.IsTrue (c.ToString () + " is out of range.", c < .7 && c > .3);
}
#endif
[Test]
public void CompareStreamWithSameSeed ()
{
Random r = new Random (42);
Random r2 = new Random (42);
double c=0, c2=0;
for (int i=0; i<20; i++) {
c += r.NextDouble ();
c2 += r2.NextDouble ();
}
Assert.AreEqual (c, c2, "Compare");
}
[Test]
public void Next ()
{
Random r = new Random ();
for (int i=0; i<20; i++) {
long c = r.Next ();
Assert.IsTrue (c < Int32.MaxValue && c >= 0, "Next(" + i + ")");
}
}
[Test]
public void NextMax()
{
Random r = new Random();
for (int i=0; i<20; i++) {
long c = r.Next (10);
Assert.IsTrue (c < 10 && c >= 0, "NextMax(" + i + ")");
}
}
[Test]
public void NextMinMax()
{
Random r = new Random ();
Assert.AreEqual (42, r.Next (42, 42), "#1 Failed where min == max");
Assert.AreEqual (Int32.MaxValue, r.Next (Int32.MaxValue, Int32.MaxValue), "#2 Failed where min == max");
Assert.AreEqual (Int32.MinValue, r.Next (Int32.MinValue, Int32.MinValue), "#3 Failed where min == max");
Assert.AreEqual (0, r.Next (0, 0), "#4 Failed where min == max");
for (int i = 1; i <= Int32.MaxValue / 2; i *= 2) {
long c = r.Next (i, i * 2);
Assert.IsTrue (c < i * 2, "At i=" + i + " c < i*2 failed");
Assert.IsTrue (c >= i, "At i=" + i + " c >= i failed");
}
for (int i = -1; i >= Int32.MinValue / 2; i *= 2) {
long c = r.Next (i * 2, i);
Assert.IsTrue (c < i, "At i=" + i + " c < i*2 failed");
Assert.IsTrue (c >= i * 2, "At i=" + i + " c >= i failed");
}
}
/* Mono implementation is now compatible with Knuth (not MS) implementation (choice of constants)
[Test]
public void CompareWithMS ()
{
string[] r = new string [4];
byte[] buffer = new byte [8];
int x = 4;
while (x-- > 0) {
int seed = (x << x);
Random random = new Random (seed);
random.NextBytes (buffer);
r [x] = BitConverter.ToString (buffer);
}
Assert.AreEqual ("43-DB-8B-AE-0A-88-A8-7B", r [3], "Seed(24)");
Assert.AreEqual ("E7-2A-5C-44-D1-8C-7D-74", r [2], "Seed(8)");
Assert.AreEqual ("C5-67-2A-FC-1B-4E-CD-72", r [1], "Seed(2)");
Assert.AreEqual ("B9-D1-C4-8E-34-8F-E7-71", r [0], "Seed(0)");
}*/
}
}
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