fix(test): fix for failing test TestNewSignalsForwarderMultipleUnix

[denis256]

Description

Fixes #000.

TODOs

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• I authored this code entirely myself
• I am submitting code based on open source software (e.g. MIT, MPL-2.0, Apache)
• I am adding or upgrading a dependency or adapted code and confirm it has a compatible open source license
• Update the docs.
• Update the changelog in the docs.
• Run the relevant tests successfully, including pre-commit checks.
• This change is backwards compatible.
• If this change is not forwards compatible (e.g. a new feature), it is gated behind a feature flag.

Summary by CodeRabbit

• Tests
  • Improved test reliability for virtual environment depth scenarios.
  • Strengthened Unix signal-forwarding tests by ensuring interrupt-count state is initialized before signals are sent.
  • Improved test signal tracking and readiness synchronization.

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Project	Deployment	Actions	Updated (UTC)
terragrunt-docs	Ready	Preview	Aug 20, 2026 4:45pm

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ℹ️ Recent review info

⚙️ Run configuration

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Plan: Pro Plus

Run ID: 059961ce-12db-4ec8-b0e0-28d85355bdf1

📥 Commits

Reviewing files that changed from the base of the PR and between 0fb4f79 and 14417c1.

📒 Files selected for processing (4)

• internal/cas/clone_e2e_test.go
• internal/cas/stacks_test.go
• internal/os/exec/cmd_unix_test.go
• internal/os/exec/testdata/test_sigint_multiple.sh

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📝 Walkthrough

Walkthrough

The changes isolate CAS test environments and update Unix signal-test synchronization. The child script publishes interrupt counts after trap handling, and the Go test waits for the initial zero count before sending signals.

Changes

Test reliability updates

Layer / File(s)	Summary
Use isolated test environments internal/cas/clone_e2e_test.go, internal/cas/stacks_test.go	CAS tests now use venvtest.NewOSWithEmptyEnv() instead of venv.OSVenv().
Synchronize signal-count publication internal/os/exec/testdata/test_sigint_multiple.sh, internal/os/exec/cmd_unix_test.go	The child script publishes changed interrupt counts after trap handling. The Unix test waits for an initial interrupt count of zero before sending signals.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 14417

This test-only change has no actionable merge-blocking risk; the ShellCheck suppression should receive normal owner confirmation.

Suggested reviewers: yhakbar

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description includes the template sections but does not describe the changes, test results, or completed TODO items.	Add a concise change summary, replace the placeholder issue reference, and complete the relevant TODO items, including test verification.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the primary change: fixing the failing TestNewSignalsForwarderMultipleUnix test.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch lint-errors-fixes

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