ci: split x86 pytests by directory

Windows x86 ci runs can fail because the container runs out of memory
during testing. This is caused by memory leaks in psyneulink and limited
available memory on the containers. As a workaround, running several
pytest commands for each subdirectory tested reduces peak memory usage.

.github/workflows/pnl-ci.yml

@@ -177,9 +177,27 @@ jobs:
           Windows*) wmic cpu get description,currentclockspeed,NumberOfCores,NumberOfEnabledCore,NumberOfLogicalProcessors; wmic memorychip get capacity,speed,status,manufacturer ;;
         esac
 
-    - name: Test with pytest
+    - name: Test with pytest (non-x86)
       timeout-minutes: 180
       run: pytest --junit-xml=tests_out.xml --verbosity=0 -n logical ${{ matrix.extra-args }}
+      if: (! contains(matrix.python-architecture, 'x86'))
+
+    # run tests in each dir separately to reduce peak memory usage
+    - name: Test with pytest (x86)
+      timeout-minutes: 180
+      shell: bash
+      # any non-zero exit code will indicate failure for GHA
+      run: |
+        test_dirs=$(find psyneulink tests/* -maxdepth 0 -type d)
+        for td in $test_dirs; do echo "Running pytest $td"; pytest --junit-xml=tests_$(echo $td | sed 's;/;_;g').xml --verbosity=0 -n logical ${{ matrix.extra-args }} "$td"; done
+      if: contains(matrix.python-architecture, 'x86')
+
+    - name: Merge junit xml (x86)
+      shell: bash
+      run: |
+        pip install junitparser
+        junitparser merge tests*.xml tests_out.xml
+      if: contains(matrix.python-architecture, 'x86')
 
     - name: Upload test results
       uses: actions/upload-artifact@v4