feat: add a test for pytest-xdist compatibility

.github/workflows/ci.yml

@@ -49,9 +49,9 @@ jobs:
         name: Install valgrind
         run: sudo apt-get install valgrind -y
       - name: Install dependencies
-        run: pip install .[dev]
-      - if: matrix.config == 'pytest-benchmark'
-        name: Install pytest-benchmark to test compatibility
-        run: pip install pytest-benchmark~=4.0.0
+        run: pip install .[dev,compat]
+      - if: matrix.config != 'pytest-benchmark'
+        name: Uninstall pytest-benchmark
+        run: pip uninstall -y pytest-benchmark
       - name: Run tests
         run: pytest -vs

pyproject.toml

@@ -42,7 +42,7 @@ dependencies = [
 
 [project.optional-dependencies]
 lint = ["black ~= 23.3.0", "isort ~=5.12.0", "mypy ~= 1.3.0", "ruff ~= 0.0.275"]
-compat = ["pytest-benchmark ~= 4.0.0"]
+compat = ["pytest-benchmark ~= 4.0.0", "pytest-xdist ~= 2.0.0"]
 test = ["pytest ~= 7.0", "pytest-cov ~= 4.0.0"]
 
 [project.entry-points]

tests/conftest.py

@@ -10,6 +10,9 @@
 skip_without_pytest_benchmark = pytest.mark.skipif(
     not IS_PYTEST_BENCHMARK_INSTALLED, reason="pytest_benchmark not installed"
 )
+skip_with_pytest_benchmark = pytest.mark.skipif(
+    IS_PYTEST_BENCHMARK_INSTALLED, reason="pytest_benchmark installed"
+)
 if IS_PYTEST_BENCHMARK_INSTALLED:
     pytest_plugins.append("pytest_benchmark")
     print(

tests/test_pytest_plugin.py

@@ -5,6 +5,7 @@
 from conftest import (
     IS_PERF_TRAMPOLINE_SUPPORTED,
     skip_with_perf_trampoline,
+    skip_with_pytest_benchmark,
     skip_without_perf_trampoline,
     skip_without_pytest_benchmark,
     skip_without_valgrind,
@@ -319,3 +320,29 @@ def fixtured_child():
             "py::test_some_addition_fixtured.<locals>.fixtured_child" in line
             for line in lines
         ), "No fixtured child test frame found in perf map"
+
+
+@skip_without_valgrind
+@skip_with_pytest_benchmark
+def test_pytest_xdist_concurrency_compatibility(
+    pytester: pytest.Pytester, codspeed_env
+) -> None:
+    pytester.makepyfile(
+        """
+        import time, pytest
+
+        def do_something():
+            time.sleep(1)
+
+        @pytest.mark.parametrize("i", range(256))
+        def test_my_stuff(benchmark, i):
+            benchmark(do_something)
+        """
+    )
+    # Run the test multiple times to reduce the chance of a false positive
+    ITERATIONS = 5
+    for i in range(ITERATIONS):
+        with codspeed_env():
+            result = pytester.runpytest("--codspeed", "-n", "128")
+        assert result.ret == 0, "the run should have succeeded"
+        assert result.stdout.fnmatch_lines(["*256 passed*"])