From b9c1999569a54a77c9eb7340dd9f3a86cb302862 Mon Sep 17 00:00:00 2001
From: Lukas Geiger <lukas@um-bruch.org>
Date: Mon, 12 Oct 2026 04:44:27 +0200
Subject: [PATCH 1/3] Diagnose Windows Python 3.12 pytest exit

---
 .github/workflows/tests.yml | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index ea1a9d3..5697a9a 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -41,11 +41,37 @@ jobs:
         run: python -m ruff check .
 
       - name: Run tests
+        if: matrix.python-version != '3.12'
         env:
           QT_QPA_PLATFORM: offscreen
           PYTHONIOENCODING: utf-8
         run: python -m pytest -q
 
+      - name: Diagnose Python 3.12 test process shutdown
+        if: matrix.python-version == '3.12'
+        shell: pwsh
+        env:
+          QT_QPA_PLATFORM: offscreen
+          PYTHONIOENCODING: utf-8
+        run: |
+          $ErrorActionPreference = 'Continue'
+          $PSNativeCommandUseErrorActionPreference = $false
+          Write-Output "DIAGNOSTIC_START: Python 3.12 pytest"
+          python -c 'import importlib.metadata as m, sys; print("PYTHON_VERSION="+sys.version.split()[0]); print("PYTEST_VERSION="+m.version("pytest")); print("PYSIDE6_VERSION="+m.version("PySide6")); print("SHIBOKEN6_VERSION="+m.version("shiboken6"))'
+          $versionExitCode = $LASTEXITCODE
+          Write-Output "VERSION_PROBE_PROCESS_EXIT_CODE=$versionExitCode"
+          if ($versionExitCode -ne 0) {
+            Write-Output "DIAGNOSTIC_END: version probe failed"
+            exit $versionExitCode
+          }
+          Write-Output "PYTEST_PROCESS_START"
+          python -X faulthandler -m pytest -q
+          $pytestExitCode = $LASTEXITCODE
+          Write-Output "PYTEST_PROCESS_EXIT_CODE=$pytestExitCode"
+          Write-Output "PYTEST_PROCESS_END"
+          Write-Output "DIAGNOSTIC_END"
+          exit $pytestExitCode
+
       - name: Compile Python sources
         env:
           PYTHONIOENCODING: utf-8

From 6b096409a4e9b637b0ffa37df6580d2a05a09f48 Mon Sep 17 00:00:00 2001
From: Lukas Geiger <lukas@um-bruch.org>
Date: Mon, 12 Oct 2026 04:48:21 +0200
Subject: [PATCH 2/3] Capture pytest shutdown status across Windows matrix

---
 .github/workflows/tests.yml | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 5697a9a..d3ddfca 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -40,15 +40,7 @@ jobs:
       - name: Lint with ruff
         run: python -m ruff check .
 
-      - name: Run tests
-        if: matrix.python-version != '3.12'
-        env:
-          QT_QPA_PLATFORM: offscreen
-          PYTHONIOENCODING: utf-8
-        run: python -m pytest -q
-
-      - name: Diagnose Python 3.12 test process shutdown
-        if: matrix.python-version == '3.12'
+      - name: Diagnose Windows pytest process shutdown
         shell: pwsh
         env:
           QT_QPA_PLATFORM: offscreen
@@ -56,7 +48,7 @@ jobs:
         run: |
           $ErrorActionPreference = 'Continue'
           $PSNativeCommandUseErrorActionPreference = $false
-          Write-Output "DIAGNOSTIC_START: Python 3.12 pytest"
+          Write-Output "DIAGNOSTIC_START: Windows pytest process"
           python -c 'import importlib.metadata as m, sys; print("PYTHON_VERSION="+sys.version.split()[0]); print("PYTEST_VERSION="+m.version("pytest")); print("PYSIDE6_VERSION="+m.version("PySide6")); print("SHIBOKEN6_VERSION="+m.version("shiboken6"))'
           $versionExitCode = $LASTEXITCODE
           Write-Output "VERSION_PROBE_PROCESS_EXIT_CODE=$versionExitCode"

From 3cae09e270c260d0cc7e98069656b684a9bd6233 Mon Sep 17 00:00:00 2001
From: Lukas Geiger <lukas@um-bruch.org>
Date: Mon, 12 Oct 2026 04:59:10 +0200
Subject: [PATCH 3/3] ci: isolate Windows pytest shutdown failures by module

---
 .github/workflows/tests.yml | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index d3ddfca..8515b87 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -43,6 +43,7 @@ jobs:
       - name: Diagnose Windows pytest process shutdown
         shell: pwsh
         env:
+          PYTHON_VERSION: ${{ matrix.python-version }}
           QT_QPA_PLATFORM: offscreen
           PYTHONIOENCODING: utf-8
         run: |
@@ -61,6 +62,29 @@ jobs:
           $pytestExitCode = $LASTEXITCODE
           Write-Output "PYTEST_PROCESS_EXIT_CODE=$pytestExitCode"
           Write-Output "PYTEST_PROCESS_END"
+          if ($pytestExitCode -ne 0 -and $env:PYTHON_VERSION -in @('3.10', '3.11')) {
+            Write-Output "MODULE_DIAGNOSIS_START=full-suite-exit-$pytestExitCode"
+            $moduleFailures = @()
+            $testFiles = @(Get-ChildItem tests -Filter 'test_*.py' -File | Sort-Object Name)
+            foreach ($testFile in $testFiles) {
+              $relativePath = "tests/$($testFile.Name)"
+              Write-Output "MODULE_CHILD_START=$relativePath"
+              python -X faulthandler -m pytest -q $relativePath
+              $moduleExitCode = $LASTEXITCODE
+              Write-Output "MODULE_CHILD_EXIT_CODE=${relativePath}:$moduleExitCode"
+              if ($moduleExitCode -ne 0) {
+                $moduleFailures += "$relativePath=$moduleExitCode"
+              }
+            }
+            Write-Output "MODULE_CHILD_COUNT=$($testFiles.Count)"
+            if ($moduleFailures.Count -eq 0) {
+              Write-Output "MODULE_DIAGNOSIS_ALL_CHILDREN_EXITED_0; FULL_SUITE_REMAINS_FAILED=$pytestExitCode"
+            } else {
+              Write-Output "MODULE_DIAGNOSIS_FAILURES=$($moduleFailures -join '; ')"
+              Write-Output "FULL_SUITE_REMAINS_FAILED=$pytestExitCode"
+            }
+            Write-Output "MODULE_DIAGNOSIS_END"
+          }
           Write-Output "DIAGNOSTIC_END"
           exit $pytestExitCode