Fix the dep on cenkalti

vendor/github.com/cenkalti/backoff/tries_test.go

@@ -0,0 +1,55 @@
+package backoff
+
+import (
+	"math/rand"
+	"testing"
+	"time"
+)
+
+func TestMaxTriesHappy(t *testing.T) {
+	r := rand.New(rand.NewSource(time.Now().UnixNano()))
+	max := 17 + r.Intn(13)
+	bo := WithMaxTries(&ZeroBackOff{}, uint64(max))
+
+	// Load up the tries count, but reset should clear the record
+	for ix := 0; ix < max/2; ix++ {
+		bo.NextBackOff()
+	}
+	bo.Reset()
+
+	// Now fill the tries count all the way up
+	for ix := 0; ix < max; ix++ {
+		d := bo.NextBackOff()
+		if d == Stop {
+			t.Errorf("returned Stop on try %d", ix)
+		}
+	}
+
+	// We have now called the BackOff max number of times, we expect
+	// the next result to be Stop, even if we try it multiple times
+	for ix := 0; ix < 7; ix++ {
+		d := bo.NextBackOff()
+		if d != Stop {
+			t.Error("invalid next back off")
+		}
+	}
+
+	// Reset makes it all work again
+	bo.Reset()
+	d := bo.NextBackOff()
+	if d == Stop {
+		t.Error("returned Stop after reset")
+	}
+
+}
+
+func TestMaxTriesZero(t *testing.T) {
+	// It might not make sense, but its okay to send a zero
+	bo := WithMaxTries(&ZeroBackOff{}, uint64(0))
+	for ix := 0; ix < 11; ix++ {
+		d := bo.NextBackOff()
+		if d == Stop {
+			t.Errorf("returned Stop on try %d", ix)
+		}
+	}
+}