started the stats module

stats_test.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"testing"
+)
+
+func TestNewStats(t *testing.T) {
+	s := NewStatAggregator()
+	if s.n != 0 ||
+		s.sum != 0 ||
+		s.sumOfTheSquares != 0 ||
+		len(s.histogram) != initialLength ||
+		s.min != veryBig ||
+		s.max != verySmall {
+		t.Fail()
+	}
+}
+
+func TestAddStatsBasic(t *testing.T) {
+
+	numbers := []float64{-1, 1, 20, 3}
+	c := make(chan float64)
+	o := make(chan *Stats)
+	s := NewStatAggregator()
+	go s.AddStats(c, o)
+	for _, n := range numbers {
+		c <- n
+	}
+	close(c)
+	<-o
+	if s.n != 4. || s.min != -1. || s.max != 20. || s.sum != 23. || s.sumOfTheSquares != 411. {
+		t.Error(">>>", s.max, s.min)
+	}
+
+}