public void Add_Where_ItemsExists_Expect_False()
{
ExecutionStatusCallbackDispatcher _executionStatusCallbackDispatcher = new ExecutionStatusCallbackDispatcher();
Guid guid = Guid.NewGuid();
Action<ExecutionStatusCallbackMessage> callback = m => { };
_executionStatusCallbackDispatcher.Add(guid, callback);
const bool expected = false;
bool actual = _executionStatusCallbackDispatcher.Add(guid, callback);
Assert.AreEqual(expected, actual);
}