Tests: Unset PYTEST_XDIST_AUTO_NUM_WORKERS when the behavior without the envvar is asserted

testing/test_plugin.py

@@ -54,6 +54,8 @@ def test_auto_detect_cpus(
 ) -> None:
     from xdist.plugin import pytest_cmdline_main as check_options
 
+    monkeypatch.delenv("PYTEST_XDIST_AUTO_NUM_WORKERS", raising=False)
+
     with suppress(ImportError):
         import psutil
 
@@ -101,6 +103,7 @@ def test_auto_detect_cpus_psutil(
 
     psutil = pytest.importorskip("psutil")
 
+    monkeypatch.delenv("PYTEST_XDIST_AUTO_NUM_WORKERS", raising=False)
     monkeypatch.setattr(psutil, "cpu_count", lambda logical=True: 84 if logical else 42)
 
     config = pytester.parseconfigure("-nauto")
@@ -117,6 +120,8 @@ def test_auto_detect_cpus_os(
 ) -> None:
     from xdist.plugin import pytest_cmdline_main as check_options
 
+    monkeypatch.delenv("PYTEST_XDIST_AUTO_NUM_WORKERS", raising=False)
+
     config = pytester.parseconfigure("-nauto")
     check_options(config)
     assert config.getoption("numprocesses") == 3
@@ -178,6 +183,8 @@ def test_hook_auto_num_workers_none(
     # but we document it so let's test it.
     from xdist.plugin import pytest_cmdline_main as check_options
 
+    monkeypatch.delenv("PYTEST_XDIST_AUTO_NUM_WORKERS", raising=False)
+
     pytester.makeconftest(
         """
         def pytest_xdist_auto_num_workers():