Harden iOS-sim CI: destination fallback + Noise reconnect test determinism (#1483)

Two CI-robustness fixes for the iOS-simulator job seen on main:

1. The destination picker no longer dies on runner images with placeholder/unavailable simulator lists (macos-26-arm64 20260720.0258): it filters error/unavailable rows, falls back to xcrun simctl's available-device list, and as a last resort creates a simulator from the newest installed iOS runtime's own supported iPhone device types. Each path logs which route was taken.

2. Deflakes NoiseEncryptionServiceTests' quarantine-restore test: the injected 20ms responder timeout also armed during the SETUP handshake, so a loaded runner tore down the half-open responder session before the scenario began (production quarantine/restore verified correct — the failure signature was a fresh msg2 to a session-less peer). Timeout raised to 1s and the fixed 100ms sleep replaced with a bounded waitUntil on the restore condition. No assertion weakened; 10/10 sequential + 3/3 under full-core CPU load.

.github/workflows/swift-tests.yml

@@ -190,12 +190,19 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v5
 
+      # Some runner images list only placeholder destinations (rows carrying
+      # "error:" or "unavailable") or ship the selected Xcode without a
+      # matching iOS simulator runtime, so this walks three paths in order:
+      # a usable xcodebuild destination, an existing simctl device, and
+      # finally creating a device from the newest installed iOS runtime.
       - name: Select available iPhone simulator
         id: destination
         run: |
-          destinations=$(xcodebuild -project bitchat.xcodeproj -scheme "bitchat (iOS)" -showdestinations)
+          set -uo pipefail
+          destinations=$(xcodebuild -project bitchat.xcodeproj -scheme "bitchat (iOS)" -showdestinations 2>/dev/null || true)
           destination_id=$(awk -F'id:' '
-            /platform:iOS Simulator/ && /name:iPhone/ && !found {
+            /platform:iOS Simulator/ && /name:iPhone/ \
+              && !/error/ && !/unavailable/ && !found {
               value=$2
               sub(/,.*/, "", value)
               gsub(/^[[:space:]]+|[[:space:]]+$/, "", value)
@@ -203,10 +210,47 @@ jobs:
               found=1
             }
           ' <<< "$destinations")
-          if [ -z "$destination_id" ]; then
-            echo "::error::No available iPhone simulator destination found"
-            exit 1
+
+          if [ -n "$destination_id" ]; then
+            echo "Selected destination via xcodebuild -showdestinations: $destination_id"
+          else
+            echo "No usable iPhone destination in -showdestinations output; falling back to simctl"
+            destination_id=$(xcrun simctl list devices available --json | jq -r '
+              [.devices | to_entries[]
+                | select(.key | contains("iOS"))
+                | .value[]
+                | select(.isAvailable and (.name | startswith("iPhone")))]
+              | first.udid // empty')
+            if [ -n "$destination_id" ]; then
+              echo "Selected existing simctl device: $destination_id"
+            else
+              echo "No available iPhone simulator device; creating one"
+              # Newest installed iOS runtime plus an iPhone device type that
+              # runtime itself reports as supported, so the pair always match.
+              create_spec=$(xcrun simctl list runtimes --json | jq -r '
+                [.runtimes[] | select(.platform == "iOS" and .isAvailable)]
+                | sort_by(.version | split(".") | map(tonumber))
+                | last // empty
+                | .identifier as $runtime
+                | ([(.supportedDeviceTypes // [])[]
+                    | select(.productFamily == "iPhone"
+                        or (.name // "" | startswith("iPhone")))]
+                  | first.identifier // empty) as $devicetype
+                | "\($devicetype) \($runtime)"')
+              read -r devicetype runtime <<< "$create_spec" || true
+              if [ -z "${devicetype:-}" ] || [ -z "${runtime:-}" ]; then
+                echo "::error::No iPhone simulator destination found and none creatable (no installed iOS runtime with an iPhone device type)"
+                exit 1
+              fi
+              destination_id=$(xcrun simctl create ci-iphone "$devicetype" "$runtime") || {
+                echo "::error::simctl create failed for $devicetype on $runtime"
+                exit 1
+              }
+              echo "Created simulator $destination_id ($devicetype, $runtime)"
+            fi
           fi
+
+          echo "Using iPhone simulator destination id: $destination_id"
           echo "id=$destination_id" >> "$GITHUB_OUTPUT"
 
       - name: Run iOS tests

bitchatTests/Services/NoiseEncryptionServiceTests.swift

@@ -1235,9 +1235,17 @@ struct NoiseEncryptionServiceTests {
     @Test("Lost reconnect completion restores the quarantined transport")
     func timedOutReconnectRestoresQuarantinedTransport() async throws {
         let alice = NoiseEncryptionService(keychain: MockKeychain())
+        // The injected responder timeout also arms during the ordinary setup
+        // handshake below (bob is its responder), where the only work between
+        // message 1 and message 3 is two consecutive synchronous statements.
+        // It must be generous enough that a preempted runner cannot let the
+        // timeout fire mid-setup and tear down the half-open responder — at
+        // 20ms a loaded 2-core CI runner did exactly that, so message 3 was
+        // answered as a fresh initiation (96-byte message 2) and nothing was
+        // ever quarantined.
         let bob = NoiseEncryptionService(
             keychain: MockKeychain(),
-            ordinaryResponderHandshakeTimeout: 0.02
+            ordinaryResponderHandshakeTimeout: 1.0
         )
         let mallory = NoiseEncryptionService(keychain: MockKeychain())
         let alicePeerID = PeerID(publicKey: alice.getStaticPublicKeyData())
@@ -1253,9 +1261,17 @@ struct NoiseEncryptionServiceTests {
         )
         #expect(!bob.hasEstablishedSession(with: alicePeerID))
 
-        try? await Task.sleep(nanoseconds: 100_000_000)
-
-        #expect(bob.hasEstablishedSession(with: alicePeerID))
+        // Poll instead of sleeping a fixed interval: the responder timeout
+        // fires on bob's manager queue at the quarantine deadline, and a
+        // starved runner can delay that work item well past the deadline.
+        let restored = await TestHelpers.waitUntil(
+            { bob.hasEstablishedSession(with: alicePeerID) },
+            timeout: TestConstants.longTimeout
+        )
+        try #require(
+            restored,
+            "Responder timeout should restore the quarantined transport"
+        )
         let oldTransport = try alice.encrypt(
             Data("timeout rollback".utf8),
             for: bobPeerID