simulation: add simulation with scheduler (#71)

- Add new field in test.Event: HistoryIndex
   HistoryIndex allow us to access them by their position in event history.
- Record local time in test.App when receiving events.
- Add statisitics module for slices of test.Event.
- add new command line utility *dexcon-simulation-with-scheduler
   to verify the execution time of core.Consensus.

1 files changed, 2 insertions, 1 deletions

diff --git a/core/test/scheduler_test.go b/core/test/scheduler_test.go
index c67240f..5aef36e 100644
--- a/core/test/scheduler_test.go
+++ b/core/test/scheduler_test.go
@@ -165,7 +165,8 @@ func (s *SchedulerTestSuite) TestChildEvent() {
 		req.True(e.Time.Sub(curEvent.Time) >= 1300*time.Millisecond)
 		// Make sure ParentTime field is set and is equal to parent event's
 		// time.
-		req.Equal(e.ParentTime, curEvent.Time)
+		req.NotEqual(-1, e.ParentHistoryIndex)
+		req.Equal(e.ParentHistoryIndex, curEvent.HistoryIndex)
 		curEvent = e
 	}
 }