Add ability to use specific coverage core

.github/workflows/test.yml

@@ -23,14 +23,21 @@ jobs:
         - '3.11'
         - '3.12'
         - '3.13.0-alpha.0 - 3.13'
-        - 'pypy-3.10'
         os-version:
         - 'ubuntu-latest'
+        coverage-core:
+        - 'ctrace'
         include:
           - os-version: 'macos-latest'
             python-version: '3.x'
           - os-version: 'windows-latest'
             python-version: '3.x'
+          - os-version: 'ubuntu-latest'
+            python-version: '3.12'
+            coverage-core: 'sysmon'
+          - os-version: 'ubuntu-latest'
+            python-version: 'pypy-3.10'
+            coverage-core: 'pytrace'
 
     runs-on: ${{ matrix.os-version }}
     steps:
@@ -51,7 +58,7 @@ jobs:
       run: make mypy PYTHON=python
 
     - name: Test
-      run: make coverage PYTHON=python
+      run: make coverage PYTHON=python COVERAGE_CORE=${{ matrix.coverage-core }}
 
     - name: Upload Coverage as artifact
       if: always()

Makefile

@@ -55,6 +55,8 @@ BUILDDIR      = _build
 html:
 	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
 
+# Pass the desired coverage tracer name to subprocesses
+export COVERAGE_CORE
 
 # Copyright (C) 2021 Jeff Epler <jepler@gmail.com>
 # SPDX-FileCopyrightText: 2021 Jeff Epler