public void WhenTraceSourceScopeCreatedWithUsableCreate_ThenItIsLazy()
{
using (var trace = new TraceListenerScope())
{
var usable =
from outer in Usable.Create(() => new TraceSourceScope("outer"), s => s.Dispose())
from inner in new TraceSourceScope($"{outer.Operation}/inner")
select $"{inner.Operation}/value".Trace();
Assert.Equal(new string[] { }, trace.ToLines());
var value = usable.Value();
}
Assert.Equal(0, Trace.IndentLevel);
}