public void TestSetLength()
{
using (var stream = new MeasuringStream()) {
Assert.Throws <ArgumentOutOfRangeException> (() => stream.SetLength(-1));
stream.SetLength(1024);
Assert.AreEqual(1024, stream.Length);
}
}
public void TestSeek()
{
using (var stream = new MeasuringStream()) {
stream.SetLength(1024);
for (int attempt = 0; attempt < 10; attempt++)
{
long offset = random.Next() % stream.Length;
stream.Position = offset;
long actual = stream.Position;
long expected = offset;
Assert.AreEqual(expected, actual, "SeekOrigin.Begin");
Assert.AreEqual(expected, stream.Position, "Position");
if (offset > 0)
{
// seek backwards from current position
offset = -1 * (random.Next() % offset);
expected += offset;
actual = stream.Seek(offset, SeekOrigin.Current);
Assert.AreEqual(expected, actual, "SeekOrigin.Current (-)");
Assert.AreEqual(expected, stream.Position, "Position");
}
if (actual < stream.Length)
{
// seek forwards from current position
offset = random.Next() % (stream.Length - actual);
expected += offset;
actual = stream.Seek(offset, SeekOrigin.Current);
Assert.AreEqual(expected, actual, "SeekOrigin.Current (+)");
Assert.AreEqual(expected, stream.Position, "Position");
}
// seek backwards from the end of the stream
offset = -1 * (random.Next() % stream.Length);
expected = stream.Length + offset;
actual = stream.Seek(offset, SeekOrigin.End);
Assert.AreEqual(expected, actual, "SeekOrigin.End");
Assert.AreEqual(expected, stream.Position, "Position");
}
Assert.Throws <IOException> (() => stream.Seek(-1, SeekOrigin.Begin));
}
}
