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//
// System.Random Test Cases
//
// Author: Bob Smith <bob@thestuff.net>
//
using NUnit.Framework;
using System;
namespace MonoTests.System {
public class RandomTest : TestCase
{
public static ITest Suite {
get {
return new TestSuite(typeof(RandomTest));
}
}
public RandomTest() : base ("MonoTests.System.RandomTest testcase") {}
public RandomTest(string name): base(name){}
public void TestDouble()
{
Random r = new Random();
int i;
double c=0;
for (i=0; i<20; i++) c+=r.NextDouble();
c/=i;
Assert (c.ToString() + " is out of range.", c < .7 && c > .3);
}
public void TestSeed()
{
Random r = new Random(42);
Random r2 = new Random(42);
int i;
double c=0, c2=0;
for (i=0; i<20; i++)
{
c += r.NextDouble();
c2 += r2.NextDouble();
}
AssertEquals(c, c2);
}
public void TestNext()
{
Random r = new Random();
int i;
long c;
for (i=0; i<20; i++)
{
c = r.Next();
Assert (c < Int32.MaxValue && c >= 0);
}
}
public void TestNextMax()
{
Random r = new Random();
int i;
long c;
for (i=0; i<20; i++)
{
c = r.Next(10);
Assert (c < 10 && c >= 0);
}
}
public void TestNextMinMax()
{
Random r = new Random();
int i;
long c;
AssertEquals ("#1 Failed where min == max", 42, r.Next (42, 42));
AssertEquals ("#2 Failed where min == max", Int32.MaxValue, r.Next (Int32.MaxValue,Int32.MaxValue));
AssertEquals ("#3 Failed where min == max", Int32.MinValue, r.Next (Int32.MinValue,Int32.MinValue));
AssertEquals ("#4 Failed where min == max", 0, r.Next (0, 0));
for (i = 1; i <= Int32.MaxValue / 2; i *= 2)
{
c = r.Next (i, i * 2);
Assert ("At i=" + i + " c < i*2 failed", c < i * 2);
Assert ("At i=" + i + " c >= i failed", c >= i);
}
for (i = -1; i >= Int32.MinValue / 2; i *= 2)
{
c = r.Next (i * 2, i);
Assert ("At i=" + i + " c < i*2 failed", c < i);
Assert ("At i=" + i + " c >= i failed", c >= i * 2);
}
}
}
}
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