Stabilize recording coordinator timing tests

MeetingAssistant.Tests/RecordingCoordinatorTests.cs

@@ -15,7 +15,7 @@ namespace MeetingAssistant.Tests;
 
 public sealed class RecordingCoordinatorTests
 {
-    private static async Task WaitUntilAsync(Func<bool> condition)
+    private static async Task WaitUntilAsync(Func<bool> condition, string? timeoutMessage = null)
     {
         var deadline = DateTimeOffset.UtcNow.AddSeconds(15);
         while (DateTimeOffset.UtcNow < deadline)
@@ -28,7 +28,7 @@ public sealed class RecordingCoordinatorTests
             await Task.Delay(25);
         }
 
-        throw new TimeoutException("Condition was not met.");
+        throw new TimeoutException(timeoutMessage ?? "Condition was not met.");
     }
 
     private static async Task AppendTextWithRetryAsync(string path, string text)
@@ -365,6 +365,7 @@ public sealed class RecordingCoordinatorTests
         await WaitUntilAsync(() => transcriptStore.Segments.Any(segment =>
             segment.Text.Contains("latest transcript text", StringComparison.Ordinal)));
 
+        await WaitUntilAsync(() => clock.PendingDelayCount > 0);
         clock.Advance(TimeSpan.FromSeconds(2));
         await promptService.WaitForPromptAsync();
         await WaitUntilAsync(() => summaryPipeline.WasRun);
@@ -414,8 +415,10 @@ public sealed class RecordingCoordinatorTests
 
         await coordinator.StartAsync(CancellationToken.None);
 
+        await WaitUntilAsync(() => clock.PendingDelayCount > 0);
         clock.Advance(TimeSpan.FromSeconds(5));
         await WaitUntilAsync(() => !coordinator.CurrentStatus.IsRecording);
+        await WaitUntilAsync(() => summaryPipeline.WasRun);
 
         Assert.Empty(promptService.Requests);
         Assert.False(coordinator.CurrentStatus.IsRecording);
@@ -459,6 +462,7 @@ public sealed class RecordingCoordinatorTests
             inactivityClock: clock);
 
         await coordinator.StartAsync(CancellationToken.None);
+        await WaitUntilAsync(() => clock.PendingDelayCount > 0);
         clock.Advance(TimeSpan.FromSeconds(2));
         await promptService.WaitForPromptAsync();
         await WaitUntilAsync(() => clock.PendingDelayCount > 0);
@@ -509,12 +513,14 @@ public sealed class RecordingCoordinatorTests
         await audioSource.WriteAsync(new AudioChunk([1, 0], 16000, 1), CancellationToken.None);
         await WaitUntilAsync(() => transcriptStore.Segments.Any(segment =>
             segment.Text.Contains("chunk:2", StringComparison.Ordinal)));
+        await WaitUntilAsync(() => clock.PendingDelayCount > 0);
         clock.Advance(TimeSpan.FromSeconds(2));
         await WaitUntilAsync(() => promptService.Requests.Count == 1);
 
         await audioSource.WriteAsync(new AudioChunk([1, 0, 2, 0], 16000, 1), CancellationToken.None);
         await WaitUntilAsync(() => transcriptStore.Segments.Any(segment =>
             segment.Text.Contains("chunk:4", StringComparison.Ordinal)));
+        await WaitUntilAsync(() => clock.PendingDelayCount > 0);
         clock.Advance(TimeSpan.FromSeconds(2));
         await WaitUntilAsync(() => promptService.Requests.Count == 2);
 
@@ -2167,8 +2173,8 @@ public sealed class RecordingCoordinatorTests
 
     private sealed class InMemoryTranscriptStore : ITranscriptStore
     {
+        private readonly object gate = new();
         private readonly List<TranscriptionSegment> segments = [];
-        private readonly TaskCompletionSource segmentWritten = new(TaskCreationOptions.RunContinuationsAsynchronously);
         private readonly string transcriptPath;
 
         public InMemoryTranscriptStore(string transcriptPath = "memory-transcript.md")
@@ -2191,30 +2197,33 @@ public sealed class RecordingCoordinatorTests
 
         public Task AppendLineAsync(TranscriptSession session, string line, CancellationToken cancellationToken)
         {
-            segments.Add(ParseTranscriptLine(line));
-            segmentWritten.TrySetResult();
+            lock (gate)
+            {
+                segments.Add(ParseTranscriptLine(line));
+            }
+
             return Task.CompletedTask;
         }
 
-        public async Task WaitForTextAsync(string text)
+        public Task WaitForTextAsync(string text)
         {
-            var deadline = DateTimeOffset.UtcNow.AddSeconds(5);
-            while (DateTimeOffset.UtcNow < deadline)
-            {
-                if (segments.Any(segment => segment?.Text?.Contains(text, StringComparison.Ordinal) == true))
-                {
-                    return;
-                }
-
-                await segmentWritten.Task.WaitAsync(TimeSpan.FromMilliseconds(100));
-            }
-
-            throw new TimeoutException($"Segment containing '{text}' was not written.");
+            return WaitUntilAsync(
+                () => Segments.Any(segment => segment?.Text?.Contains(text, StringComparison.Ordinal) == true),
+                $"Segment containing '{text}' was not written.");
         }
 
         public IReadOnlyList<TranscriptionSegment> ReplacedSegments { get; private set; } = [];
 
-        public IReadOnlyList<TranscriptionSegment> Segments => segments;
+        public IReadOnlyList<TranscriptionSegment> Segments
+        {
+            get
+            {
+                lock (gate)
+                {
+                    return segments.ToArray();
+                }
+            }
+        }
 
         public MeetingNote? MetadataMeetingNote { get; private set; }
 
@@ -2242,7 +2251,6 @@ public sealed class RecordingCoordinatorTests
     {
         private int created;
         private int appendCount;
-        private TaskCompletionSource appendObserved = new(TaskCreationOptions.RunContinuationsAsynchronously);
 
         public List<TranscriptWrite> AppendHistory { get; } = [];
 
@@ -2268,29 +2276,14 @@ public sealed class RecordingCoordinatorTests
         {
             AppendHistory.Add(new TranscriptWrite(session, ParseTranscriptLine(line)));
             Interlocked.Increment(ref appendCount);
-            appendObserved.TrySetResult();
             return Task.CompletedTask;
         }
 
-        public async Task WaitForAppendCountAsync(int expectedCount)
+        public Task WaitForAppendCountAsync(int expectedCount)
         {
-            var deadline = DateTimeOffset.UtcNow.AddSeconds(5);
-            while (DateTimeOffset.UtcNow < deadline)
-            {
-                if (Volatile.Read(ref appendCount) >= expectedCount)
-                {
-                    return;
-                }
-
-                var observed = appendObserved;
-                await observed.Task.WaitAsync(TimeSpan.FromMilliseconds(100));
-                if (ReferenceEquals(observed, appendObserved))
-                {
-                    appendObserved = new TaskCompletionSource(TaskCreationOptions.RunContinuationsAsynchronously);
-                }
-            }
-
-            throw new TimeoutException($"Expected {expectedCount} transcript append(s).");
+            return WaitUntilAsync(
+                () => Volatile.Read(ref appendCount) >= expectedCount,
+                $"Expected {expectedCount} transcript append(s).");
         }
 
         public Task ReplaceLinesAsync(