/// <exception cref="System.IO.IOException"/>
public virtual void TestDUGetUsedWillNotReturnNegative()
{
FilePath file = new FilePath(DuDir, "data");
Assert.True(file.CreateNewFile());
Configuration conf = new Configuration();
conf.SetLong(CommonConfigurationKeys.FsDuIntervalKey, 10000L);
DU du = new DU(file, conf);
du.DecDfsUsed(long.MaxValue);
long duSize = du.GetUsed();
Assert.True(duSize.ToString(), duSize >= 0L);
}
