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Yield during main actor stress testing

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jack
2026-07-10 17:24:10 -04:00
parent 8b8ad2893e
commit ce7532c02d
1 changed files with 13 additions and 5 deletions
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bitchatTests/ConversationStoreTests.swift
+13 -5
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@@ -334,7 +334,7 @@ struct ConversationStoreTests {
@Test("logical index offset matches a reference model under adversarial mutations") @Test("logical index offset matches a reference model under adversarial mutations")
@MainActor @MainActor
func logicalIndexOffsetDifferentialStress() { func logicalIndexOffsetDifferentialStress() async {
let store = ConversationStore() let store = ConversationStore()
let cap = store.conversation(for: .mesh).cap let cap = store.conversation(for: .mesh).cap
var reference = ReferenceConversationTimeline(cap: cap) var reference = ReferenceConversationTimeline(cap: cap)
@@ -383,20 +383,23 @@ struct ConversationStoreTests {
return expected return expected
} }
func refill(extra: Int, checkpoint: String) { func refill(extra: Int, checkpoint: String) async {
let appendCount = max(0, cap - reference.messages.count) + extra let appendCount = max(0, cap - reference.messages.count) + extra
for index in 0..<appendCount { for index in 0..<appendCount {
appendAndCompare( appendAndCompare(
issueMessage(tag: "refill"), issueMessage(tag: "refill"),
checkpoint: "\(checkpoint)-\(index)" checkpoint: "\(checkpoint)-\(index)"
) )
if index.isMultiple(of: 64) {
await Task.yield()
}
} }
expectStore(store, matches: reference, issuedIDs: issuedIDs, checkpoint: checkpoint) expectStore(store, matches: reference, issuedIDs: issuedIDs, checkpoint: checkpoint)
} }
// Start well into steady state so the offset is already non-zero // Start well into steady state so the offset is already non-zero
// before any mixed operations begin. // before any mixed operations begin.
refill(extra: 384, checkpoint: "initial steady-state fill") await refill(extra: 384, checkpoint: "initial steady-state fill")
for step in 0..<1_200 { for step in 0..<1_200 {
if step == 300 || step == 900 { if step == 300 || step == 900 {
@@ -535,14 +538,19 @@ struct ConversationStoreTests {
checkpoint: "mixed operation \(step)" checkpoint: "mixed operation \(step)"
) )
// This intentionally expensive MainActor stress test runs beside
// async audio/UI tests in SwiftPM's parallel phase. Cooperatively
// release the actor so their bounded waits can make progress.
await Task.yield()
if (step + 1).isMultiple(of: 100) { if (step + 1).isMultiple(of: 100) {
refill(extra: 32, checkpoint: "periodic refill after step \(step)") await refill(extra: 32, checkpoint: "periodic refill after step \(step)")
} }
} }
// Guarantee another long run of one-row evictions after every other // Guarantee another long run of one-row evictions after every other
// mutation family has perturbed and rebuilt the offset/index state. // mutation family has perturbed and rebuilt the offset/index state.
refill(extra: 512, checkpoint: "final steady-state trim run") await refill(extra: 512, checkpoint: "final steady-state trim run")
#expect(trimmedCount > 1_200) #expect(trimmedCount > 1_200)
#expect(tailAppendCount > 300) #expect(tailAppendCount > 300)