public void TestNormalizeCapacity()
{
// A few sanity checks
Assert.AreEqual(Int32.MaxValue, IoBuffer.NormalizeCapacity(-10));
Assert.AreEqual(0, IoBuffer.NormalizeCapacity(0));
Assert.AreEqual(Int32.MaxValue, IoBuffer.NormalizeCapacity(Int32.MaxValue));
Assert.AreEqual(Int32.MaxValue, IoBuffer.NormalizeCapacity(Int32.MinValue));
Assert.AreEqual(Int32.MaxValue, IoBuffer.NormalizeCapacity(Int32.MaxValue - 10));
// A sanity check test for all the powers of 2
for (int i = 0; i < 30; i++)
{
int n = 1 << i;
Assert.AreEqual(n, IoBuffer.NormalizeCapacity(n));
if (i > 1)
{
// test that n - 1 will be normalized to n (notice that n = 2^i)
Assert.AreEqual(n, IoBuffer.NormalizeCapacity(n - 1));
}
// test that n + 1 will be normalized to 2^(i + 1)
Assert.AreEqual(n << 1, IoBuffer.NormalizeCapacity(n + 1));
}
// The first performance test measures the time to normalize integers
// from 0 to 2^27 (it tests 2^27 integers)
DateTime time = DateTime.Now;
for (int i = 0; i < 1 << 27; i++)
{
IoBuffer.NormalizeCapacity(i);
}
DateTime time2 = DateTime.Now;
//Console.WriteLine("Time for performance test 1: " + (time2 - time).TotalMilliseconds + "ms");
// The second performance test measures the time to normalize integers
// from Int32.MaxValue to Int32.MaxValue - 2^27 (it tests 2^27
// integers)
time = DateTime.Now;
for (int i = Int32.MaxValue; i > Int32.MaxValue - (1 << 27); i--)
{
IoBuffer.NormalizeCapacity(i);
}
time2 = DateTime.Now;
//Console.WriteLine("Time for performance test 2: " + (time2 - time).TotalMilliseconds + "ms");
}