public void NodeMetrics_must_merge_2_NodeMetrics_by_most_recent()
{
var sample1 = new NodeMetrics(_node1, 1,
ImmutableHashSet.Create<Metric>(Metric.Create("a", 10), Metric.Create("b", 20)));
var sample2 = new NodeMetrics(_node1, 2, ImmutableHashSet.Create<Metric>(Metric.Create("a", 11), Metric.Create("c", 30)));
var merged = sample1.Merge(sample2);
merged.Timestamp.ShouldBe(sample2.Timestamp);
merged.Metric("a").Value.ShouldBe(11);
merged.Metric("b").Value.ShouldBe(20);
merged.Metric("c").Value.ShouldBe(30);
}