Logs to multiple tracer sources simulateously. Used for the source "inheritance"
Inheritance: ITraceSource
		public AggregateTraceSourceSpec()
		{
			this.first = new Mock<ITraceSource> { DefaultValue = DefaultValue.Mock };
			this.second = new Mock<ITraceSource> { DefaultValue = DefaultValue.Mock };

			this.first.SetupAllProperties();
			this.second.SetupAllProperties();

			this.aggregate = new AggregateTraceSource("Tracer", new[] { this.first.Object, this.second.Object });
		}