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‎DeployCommandIncludesDeployFlagInArguments-Investigation.md‎

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# Investigation: Flaky Test `DeployCommandIncludesDeployFlagInArguments`
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## Issue Summary
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**Test Name:** `Aspire.Cli.Tests.Commands.DeployCommandTests.DeployCommandIncludesDeployFlagInArguments`
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**GitHub Issue:** https://github.com/dotnet/aspire/issues/11217
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**Quarantined:** Yes
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**Test Location:** `/tests/Aspire.Cli.Tests/Commands/DeployCommandTests.cs:333`
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**Test Purpose:** Verifies that the deploy command passes the correct arguments (including `--deploy`, `--operation`, `--publisher`, and `--output-path`) to the AppHost when executing.
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## Test Results Analysis
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### Failure Pattern
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From the test results spanning September 20, 2025 to October 20, 2025 (63 total runs):
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- **Windows:** 30 failures / 30 runs (100% failure rate)
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- **Linux:** 9 failures / 21 runs (42.9% failure rate)
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- **macOS:** 3 failures / 12 runs (25.0% failure rate)
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### Key Observations
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1. **Platform-Specific Behavior:**
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- Windows: Consistently fails on **every** run
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- Linux: Fails intermittently (~43% of the time)
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- macOS: Fails less frequently (~25% of the time)
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2. **Failure Signature:**
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- All failures are `System.TimeoutException: The operation has timed out.`
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- Timeout occurs at line 333: `var exitCode = await result.InvokeAsync().WaitAsync(CliTestConstants.DefaultTimeout);`
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- Default timeout is 10 seconds (`TimeSpan.FromSeconds(10)`)
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3. **Consistent Output Pattern:**
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All runs (passing and failing) show the same stdout output:
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```
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Temporary workspace created at: <path>
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🔬 Checking project type...:
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../../../<guid>/AppHost.csproj
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🛠 Building apphost...
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../../../<guid>/AppHost.csproj
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🛠 Generating artifacts...
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```
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4. **The Critical Difference:**
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- **Passing tests** have an additional newline at the end of stdout output
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- **Failing tests** stop at "Generating artifacts..." without completion
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## Root Cause Analysis
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### Test Code Structure
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The test at line 270-340 sets up a mock execution environment:
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```csharp
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[QuarantinedTest("https://github.com/dotnet/aspire/issues/11217")]
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public async Task DeployCommandIncludesDeployFlagInArguments()
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{
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// ... setup code ...
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RunAsyncCallback = async (projectFile, watch, noBuild, args, env, backchannelCompletionSource, options, cancellationToken) =>
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{
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// Verify arguments
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Assert.Contains("--deploy", args);
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Assert.Contains("--operation", args);
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Assert.Contains("publish", args);
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Assert.Contains("--publisher", args);
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Assert.Contains("default", args);
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Assert.Contains("--output-path", args);
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Assert.Contains("/tmp/test", args);
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var deployModeCompleted = new TaskCompletionSource();
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var backchannel = new TestAppHostBackchannel
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{
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RequestStopAsyncCalled = deployModeCompleted // KEY ISSUE
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};
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backchannelCompletionSource?.SetResult(backchannel);
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await deployModeCompleted.Task; // Waits for RequestStopAsync to be called
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return 0;
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}
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}
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```
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### The Race Condition
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The test creates a **race condition** between publishing activity processing and timeout:
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#### Expected Flow (from `PublishCommandBase.cs:214-227`):
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```csharp
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var backchannel = await backchannelCompletionSource.Task; // Gets backchannel
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var publishingActivities = backchannel.GetPublishingActivitiesAsync(cancellationToken);
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var noFailuresReported = await ProcessAndDisplayPublishingActivitiesAsync(publishingActivities, backchannel, cancellationToken);
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await backchannel.RequestStopAsync(cancellationToken); // Only called AFTER processing activities
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var exitCode = await pendingRun;
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```
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#### The Problem:
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1. **`GetPublishingActivitiesAsync` Never Completes:**
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- The default `TestAppHostBackchannel.GetPublishingActivitiesAsync()` implementation yields activities then completes
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- However, the implementation yields a fixed set of activities and then **returns**
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- But in `ProcessAndDisplayPublishingActivitiesAsync`, the code waits for a `PublishingActivityTypes.PublishComplete` activity
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2. **Missing PublishComplete Activity:**
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Looking at `TestAppHostBackchannel.GetPublishingActivitiesAsync()` (lines 104-165), it yields:
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- One root step (InProgress)
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- Multiple tasks (child-task-1, child-task-2)
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- Root step (Completed)
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- **BUT NO `PublishingActivityTypes.PublishComplete` activity**
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3. **The Wait Sequence:**
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- Test sets `backchannelCompletionSource` → backchannel created
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- `PublishCommandBase` calls `GetPublishingActivitiesAsync`
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- `ProcessAndDisplayPublishingActivitiesAsync` waits for `PublishComplete` activity
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- Default implementation finishes yielding activities without `PublishComplete`
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- The async enumerable completes but no `PublishComplete` was received
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- Code likely hangs or continues waiting
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- `RequestStopAsync` is never called (or called too late)
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- `deployModeCompleted.Task` never completes
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- Test times out after 10 seconds
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### Why Windows Fails 100%
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Windows is likely slower at:
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- Creating temporary workspaces
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- Process startup/cleanup
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- File system operations
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This means the race condition is more likely to be lost on Windows, causing consistent timeouts.
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### Why macOS/Linux Succeed Sometimes
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On faster Unix-based systems:
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- The publishing activities enumeration might complete faster
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- There may be timing differences in how the async operations are scheduled
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- The test might "luck out" and complete within 10 seconds even with the bug
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However, the fundamental issue exists on all platforms - it's just a matter of timing.
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## Technical Details
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### Missing PublishComplete Activity
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Looking at `TestAppHostBackchannel.cs` lines 104-165:
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```csharp
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public async IAsyncEnumerable<PublishingActivity> GetPublishingActivitiesAsync([EnumeratorCancellation]CancellationToken cancellationToken)
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{
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GetPublishingActivitiesAsyncCalled?.SetResult();
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if (GetPublishingActivitiesAsyncCallback is not null)
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{
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// Custom callback path
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}
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else
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{
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// Default implementation yields activities but NO PublishComplete
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yield return new PublishingActivity { Type = PublishingActivityTypes.Step, ... };
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yield return new PublishingActivity { Type = PublishingActivityTypes.Task, ... };
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// ... more activities ...
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yield return new PublishingActivity {
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Type = PublishingActivityTypes.Step,
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Data = new PublishingActivityData {
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CompletionState = CompletionStates.Completed,
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...
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}
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};
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// Missing: PublishingActivityTypes.PublishComplete
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}
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}
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```
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### What ProcessPublishingActivitiesDebugAsync Expects
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From `PublishCommandBase.cs` lines 285-320:
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```csharp
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await foreach (var activity in publishingActivities.WithCancellation(cancellationToken))
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{
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StartTerminalProgressBar();
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if (activity.Type == PublishingActivityTypes.PublishComplete) // WAITS FOR THIS
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{
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publishingActivity = activity;
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break; // Only breaks when PublishComplete received
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}
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// ... process other activities ...
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}
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```
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The loop continues **until** a `PublishComplete` activity is received or the enumerable ends.
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## Fix Strategy
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### Option 1: Add PublishComplete Activity (Recommended)
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Modify `TestAppHostBackchannel.GetPublishingActivitiesAsync()` to yield a final `PublishComplete` activity:
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```csharp
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yield return new PublishingActivity
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{
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Type = PublishingActivityTypes.PublishComplete,
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Data = new PublishingActivityData
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{
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Id = "publish-complete",
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StatusText = "Publishing completed",
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CompletionState = CompletionStates.Completed,
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StepId = null
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}
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};
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```
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### Option 2: Use Custom Callback in Test
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Override the `GetPublishingActivitiesAsyncCallback` in the test to provide proper completion:
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```csharp
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var backchannel = new TestAppHostBackchannel
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{
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RequestStopAsyncCalled = deployModeCompleted,
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GetPublishingActivitiesAsyncCallback = async (ct) =>
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{
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// Yield minimal activities and complete properly
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yield return new PublishingActivity
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{
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Type = PublishingActivityTypes.PublishComplete,
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Data = new PublishingActivityData { /* ... */ }
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};
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}
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};
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```
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### Option 3: Increase Timeout (Not Recommended)
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Simply increasing the timeout doesn't fix the underlying bug, though it might reduce failure rates on slower machines.
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## Validation Steps
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After applying the fix:
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1. **Run the specific test multiple times:**
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```bash
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dotnet test tests/Aspire.Cli.Tests/Aspire.Cli.Tests.csproj \
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-- --filter-method "*.DeployCommandIncludesDeployFlagInArguments" \
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--filter-not-trait "quarantined=true" \
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--filter-not-trait "outerloop=true"
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```
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2. **Run in a loop to verify stability:**
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```bash
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for i in {1..50}; do
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echo "Run $i"
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dotnet test tests/Aspire.Cli.Tests/Aspire.Cli.Tests.csproj \
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-- --filter-method "*.DeployCommandIncludesDeployFlagInArguments" \
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--filter-not-trait "quarantined=true" \
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--filter-not-trait "outerloop=true" || exit 1
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done
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```
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3. **Test on all platforms:**
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- Windows (highest failure rate - critical)
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- Linux
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- macOS
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4. **Verify related tests still pass:**
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```bash
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dotnet test tests/Aspire.Cli.Tests/Aspire.Cli.Tests.csproj \
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-- --filter-class "*.DeployCommandTests" \
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--filter-not-trait "quarantined=true" \
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--filter-not-trait "outerloop=true"
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```
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5. **Check similar test patterns:**
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- `DeployCommandSucceedsWithoutOutputPath` (line 134)
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- `DeployCommandSucceedsEndToEnd` (line 201)
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- These tests might have the same issue if they rely on default `GetPublishingActivitiesAsync`
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## Additional Considerations
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### Other Affected Tests
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Review all uses of `TestAppHostBackchannel` to ensure they properly handle publishing activities:
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- `PublishCommandTests.cs`
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- `ExecCommandTests.cs`
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- `RunCommandTests.cs`
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Most of these don't use publishing activities, but should be reviewed for consistency.
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### TestAppHostBackchannel Design
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The default implementation of `GetPublishingActivitiesAsync` should probably:
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1. **Always** yield a `PublishComplete` activity at the end
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2. Or document that callers must provide a custom callback for publish scenarios
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### Long-term Solution
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Consider:
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1. Adding a test helper method that creates properly configured backchannels for deploy/publish scenarios
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2. Adding validation in `TestAppHostBackchannel` constructor to warn about incomplete configuration
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3. Updating all deploy/publish tests to use a standard pattern
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## Supporting Information
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### Test Result Summary (Last 30 Days)
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| OS | Passed | Failed | Total | Failure Rate |
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|---------|--------|--------|-------|--------------|
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| Windows | 0 | 30 | 30 | 100.0% |
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| Linux | 12 | 9 | 21 | 42.9% |
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| macOS | 9 | 3 | 12 | 25.0% |
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| **Total** | **21** | **42** | **63** | **66.7%** |
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### GitHub Actions Run URLs
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All run URLs are documented in the results.json file. Recent runs:
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- Latest failure (Windows): https://github.com/dotnet/aspire/actions/runs/18640301007
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- Latest success (Linux): https://github.com/dotnet/aspire/actions/runs/18640301007
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- Latest success (macOS): https://github.com/dotnet/aspire/actions/runs/18640301007
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### Files to Review
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1. **Test file:** `/tests/Aspire.Cli.Tests/Commands/DeployCommandTests.cs:270-340`
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2. **Test helper:** `/tests/Aspire.Cli.Tests/TestServices/TestAppHostBackchannel.cs:104-165`
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3. **Command implementation:** `/src/Aspire.Cli/Commands/PublishCommandBase.cs:214-320`
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4. **Publishing activity types:** Search for `PublishingActivityTypes.PublishComplete`
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## Conclusion
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This is a **timing-dependent race condition** caused by the test's backchannel not properly completing the publishing activities stream. The test waits for `RequestStopAsync` to be called, but that only happens after processing publishing activities, which never completes because no `PublishComplete` activity is yielded.
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The fix is straightforward: ensure `TestAppHostBackchannel.GetPublishingActivitiesAsync()` yields a `PublishComplete` activity, or override it in the test to do so.
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**Confidence Level:** HIGH - This is a clear bug in test infrastructure, not a flaky test due to environmental factors.
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**Priority:** MEDIUM - The test is already quarantined, but fixing it will improve test coverage and prevent regression.

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