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test: report exact ACK latency percentiles

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This commit is contained in:
richjohnrambo
2026-09-27 17:05:06 +08:00
parent d96f661f30
commit 3fb95fd5d9
3 changed files with 74 additions and 2 deletions
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loadtest/im-pressure/merge_test.go
+27
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@@ -5,6 +5,7 @@ import (
"os"
"path/filepath"
"testing"
"time"
)
func TestRunMergeComputesArrivalAndPersistenceGate(t *testing.T) {
@@ -53,6 +54,32 @@ func TestMergedHistogramP95(t *testing.T) {
}
}
func TestMergedAckP95UsesExactAcceptedTimestamps(t *testing.T) {
base := time.Date(2026, 9, 27, 8, 0, 0, 0, time.UTC)
agents := []AgentSummary{{
AckLatency: HistogramSnapshot{Count: 4, MaxMS: 900, Buckets: map[string]int64{"1s": 4}},
AcceptedLocal: []AcceptedMessage{
{SentAt: base, AckAt: base.Add(100 * time.Millisecond)},
{SentAt: base, AckAt: base.Add(200 * time.Millisecond)},
{SentAt: base, AckAt: base.Add(300 * time.Millisecond)},
{SentAt: base, AckAt: base.Add(400 * time.Millisecond)},
},
}}
if got := mergedAckP95(agents); got != 400 {
t.Fatalf("exact p95=%v want=400", got)
}
}
func TestMergedAckP95FallsBackWhenRawSamplesAreIncomplete(t *testing.T) {
agents := []AgentSummary{{
AckLatency: HistogramSnapshot{Count: 2, MaxMS: 900, Buckets: map[string]int64{"1s": 2}},
AcceptedLocal: []AcceptedMessage{{SentAt: time.Now(), AckAt: time.Now().Add(100 * time.Millisecond)}},
}}
if got := mergedAckP95(agents); got != 1000 {
t.Fatalf("fallback p95=%v want=1000", got)
}
}
func writeSummaryForTest(t *testing.T, path string, summary AgentSummary) {
t.Helper()
raw, err := json.Marshal(summary)