E2E Deployment Test Failure: Aspire.Deployment.EndToEnd.Tests.AksAzureKubernetesEnvironmentCertManagerTypeScriptDeploymentTests.DeployTypeScriptApiWithCertManagerToAzureKubernetesEnvironment

[mitchdenny]

Failing Test

Aspire.Deployment.EndToEnd.Tests.AksAzureKubernetesEnvironmentCertManagerTypeScriptDeploymentTests.DeployTypeScriptApiWithCertManagerToAzureKubernetesEnvironment

Symptom

System.IO.FileNotFoundException : Could not find file
'/tmp/Aspire.Cli.Tests/TemporaryWorkspaces/<guid>/AksCertManagerTs/apphost.ts'.

Thrown at tests/Aspire.Deployment.EndToEnd.Tests/AksAzureKubernetesEnvironmentCertManagerTypeScriptDeploymentTests.cs:136 inside File.ReadAllText(appHostFilePath).

Root Cause

The test (and its XML doc on line 132) hard-codes the AppHost path as apphost.ts:

var appHostFilePath = Path.Combine(projectDir, "apphost.ts");

However, since PR #16984 ("Use mts for TypeScript AppHosts"), the TypeScript starter template emits apphost.mts instead of apphost.ts. See CliTemplateFactory.TypeScriptStarterTemplate.cs#L75:

var appHostProject = _projectFactory.TryGetProject(new FileInfo(Path.Combine(outputPath, "apphost.mts")));

So the test's File.ReadAllText immediately fails because apphost.ts does not exist in the created project.

Fix

Rename the test's references to apphost.ts → apphost.mts (file path + comments + XML doc).

Affected Runs

• https://github.com/microsoft/aspire/actions/runs/26323258106 (2026-05-23)

This issue was created automatically by a workflow analyzing Deployment E2E test failures on main.

[joperezr]

🤖 Aspire triage pass — 2026-05-24 04:13 UTC

Area: area-polyglot, area-testing, area-deployment
Kind: test-failure
Repro: yes-minimal — body identifies the exact line (test reads apphost.ts while CLI now emits apphost.mts since PR #16984) and proposes a path rename fix. Cross-references CliTemplateFactory.TypeScriptStarterTemplate.cs line range.
Affected version(s): main / 13.4-dev (latest: 13.3.x in market)
Severity: S3 — test-only FileNotFoundException; product path is correct.

Urgency: 🟡 vNext — recommend milestone 13.4
Reason: Same regression class as #17429 / #17428 — TypeScript deployment E2E tests still reference apphost.ts. Fix is mechanical (rename in test file + XML doc + comments). Should land before 13.4 nightly E2E is green. Not servicing.

Suggested owner(s): @sebastienros (score 5)
Evidence:

• sebastienros is the sole non-bot committer to area-polyglot in the last 90d (Unify ATS withReference exports #15238).
• CODEOWNERS lists @sebastienros for src/Aspire.Hosting.RemoteHost/** and tests/Aspire.Hosting.Testing.Tests/**.
• Issue author is excluded per Rule S4.

Confidence: high
Needs human?: no — best fixed together with #17429 and #17428.

Dry-run mode — no labels or milestone applied. Reply /triage apply to promote, or edit and reapply.