func (S) TestAttemptTiming(c *gocheck.C) {
testAttempt := aws.AttemptStrategy{
Total: 0.25e9,
Delay: 0.1e9,
}
want := []time.Duration{0, 0.1e9, 0.2e9, 0.2e9}
got := make([]time.Duration, 0, len(want)) // avoid allocation when testing timing
t0 := time.Now()
for a := testAttempt.Start(); a.Next(); {
got = append(got, time.Now().Sub(t0))
}
got = append(got, time.Now().Sub(t0))
c.Assert(got, gocheck.HasLen, len(want))
const margin = 0.01e9
for i, got := range want {
lo := want[i] - margin
hi := want[i] + margin
if got < lo || got > hi {
c.Errorf("attempt %d want %g got %g", i, want[i].Seconds(), got.Seconds())
}
}
}
func (S) TestAttemptNextHasNext(c *gocheck.C) {
a := aws.AttemptStrategy{}.Start()
c.Assert(a.Next(), gocheck.Equals, true)
c.Assert(a.Next(), gocheck.Equals, false)
a = aws.AttemptStrategy{}.Start()
c.Assert(a.Next(), gocheck.Equals, true)
c.Assert(a.HasNext(), gocheck.Equals, false)
c.Assert(a.Next(), gocheck.Equals, false)
a = aws.AttemptStrategy{Total: 2e8}.Start()
c.Assert(a.Next(), gocheck.Equals, true)
c.Assert(a.HasNext(), gocheck.Equals, true)
time.Sleep(2e8)
c.Assert(a.HasNext(), gocheck.Equals, true)
c.Assert(a.Next(), gocheck.Equals, true)
c.Assert(a.Next(), gocheck.Equals, false)
a = aws.AttemptStrategy{Total: 1e8, Min: 2}.Start()
time.Sleep(1e8)
c.Assert(a.Next(), gocheck.Equals, true)
c.Assert(a.HasNext(), gocheck.Equals, true)
c.Assert(a.Next(), gocheck.Equals, true)
c.Assert(a.HasNext(), gocheck.Equals, false)
c.Assert(a.Next(), gocheck.Equals, false)
}