public void MergeAll()
{
Observation <string> observerA = null;
Observation <string> observerB = null;
Observation <string> observerC = null;
Observe <string> a = x => observerA = x;
Observe <string> b = x => observerB = x;
Observe <string> c = x => observerC = x;
Observe.Merge(a, b, c).ToList()(
result =>
{
var v = result.Value;
Assert.AreEqual(4, v.Count);
Assert.AreEqual("A0", v[0]);
Assert.AreEqual("B0", v[1]);
Assert.AreEqual("A1", v[2]);
Assert.AreEqual("B1", v[3]);
});
observerA(new Some <string>("A0"));
observerB(new Some <string>("B0"));
observerA(new Some <string>("A1"));
observerB(new Some <string>("B1"));
observerC(new None <string>());
observerB(new Some <string>("B2"));
}