func testHealthScheduler(t test.Tester) {
now := time.Now()
var scenarios = []struct {
futureHealthState []TargetState
preloadedTimes []time.Time
expectedSchedule []time.Time
}{
// The behavior discussed in healthScheduler.Reschedule should be read
// fully to understand the whys and wherefores.
{
futureHealthState: []TargetState{UNKNOWN, ALIVE, ALIVE},
preloadedTimes: []time.Time{now, now.Add(time.Minute), now.Add(time.Minute * 2)},
expectedSchedule: []time.Time{now, now.Add(time.Minute), now.Add(time.Minute * 2)},
},
{
futureHealthState: []TargetState{UNKNOWN, UNREACHABLE, UNREACHABLE},
preloadedTimes: []time.Time{now, now.Add(time.Minute), now.Add(time.Minute * 2)},
expectedSchedule: []time.Time{now, now.Add(time.Second * 2), now.Add(time.Minute).Add(time.Second * 4)},
},
{
futureHealthState: []TargetState{UNKNOWN, UNREACHABLE, ALIVE},
preloadedTimes: []time.Time{now, now.Add(time.Minute), now.Add(time.Minute * 2)},
expectedSchedule: []time.Time{now, now.Add(time.Second * 2), now.Add(time.Minute * 2)},
},
{
futureHealthState: []TargetState{UNKNOWN, UNREACHABLE, UNREACHABLE, UNREACHABLE, UNREACHABLE, UNREACHABLE, UNREACHABLE, UNREACHABLE, UNREACHABLE, UNREACHABLE, UNREACHABLE, UNREACHABLE, UNREACHABLE},
preloadedTimes: []time.Time{now, now.Add(time.Minute), now.Add(time.Minute * 2), now.Add(time.Minute * 3), now.Add(time.Minute * 4), now.Add(time.Minute * 5), now.Add(time.Minute * 6), now.Add(time.Minute * 7), now.Add(time.Minute * 8), now.Add(time.Minute * 9), now.Add(time.Minute * 10), now.Add(time.Minute * 11), now.Add(time.Minute * 12)},
expectedSchedule: []time.Time{now, now.Add(time.Second * 2), now.Add(time.Minute * 1).Add(time.Second * 4), now.Add(time.Minute * 2).Add(time.Second * 8), now.Add(time.Minute * 3).Add(time.Second * 16), now.Add(time.Minute * 4).Add(time.Second * 32), now.Add(time.Minute * 5).Add(time.Second * 64), now.Add(time.Minute * 6).Add(time.Second * 128), now.Add(time.Minute * 7).Add(time.Second * 256), now.Add(time.Minute * 8).Add(time.Second * 512), now.Add(time.Minute * 9).Add(time.Second * 1024), now.Add(time.Minute * 10).Add(time.Minute * 30), now.Add(time.Minute * 11).Add(time.Minute * 30)},
},
}
for i, scenario := range scenarios {
provider := &fakeTimeProvider{}
for _, time := range scenario.preloadedTimes {
provider.timeQueue = append(provider.timeQueue, time)
}
reporter := fakeHealthReporter{}
for _, state := range scenario.futureHealthState {
reporter.stateQueue = append(reporter.stateQueue, state)
}
if len(scenario.preloadedTimes) != len(scenario.futureHealthState) || len(scenario.futureHealthState) != len(scenario.expectedSchedule) {
t.Fatalf("%d. times and health reports and next time lengths were not equal.", i)
}
timer := timer{
provider: provider,
}
scheduler := healthScheduler{
timer: timer,
target: reporter,
scheduledFor: now,
}
for j := 0; j < len(scenario.preloadedTimes); j++ {
futureState := scenario.futureHealthState[j]
scheduler.Reschedule(scenario.preloadedTimes[j], futureState)
nextSchedule := scheduler.ScheduledFor()
if nextSchedule != scenario.expectedSchedule[j] {
t.Errorf("%d.%d. Expected to be scheduled to %s, got %s", i, j, scenario.expectedSchedule[j], nextSchedule)
}
}
}
}
