public MarbleSpec(MarbleTestScheduler scheduler, IReadOnlyDictionary <string, string> marblesLookup)
{
_scheduler = scheduler;
_marblesLookup = marblesLookup;
}
public MarbleSpec(MarbleTestScheduler scheduler, string spec, object?values = null) : this(scheduler, MarbleSpecParser.Parse(spec))
{
_values = values;
}