public void CombineLogTests()
{
LogFilter f = new LogFilter( LogLevelFilter.None, LogLevelFilter.Error );
LogFilter f2 = f.SetGroup( LogLevelFilter.Info );
Assert.That( f2.Line == LogLevelFilter.Error && f2.Group == LogLevelFilter.Info );
LogFilter f3 = new LogFilter( LogLevelFilter.Trace, LogLevelFilter.Info );
LogFilter f4 = f2.Combine( f3 );
Assert.That( f4.Equals( f3 ) );
Assert.That( f4 == f3 );
}