CI: Run tests with available parallelism

nibabel/tests/test_api_validators.py

@@ -1,6 +1,7 @@
 """ Metaclass and class for validating instance APIs
 """
-
+import os
+import pytest
 
 
 class validator2test(type):
@@ -82,6 +83,10 @@ def validate_something(self, obj, params):
         assert obj.get_var() == params['var']
 
 
+@pytest.mark.xfail(
+    os.getenv("PYTEST_XDIST_WORKER") is not None,
+    reason="Execution in the same scope cannot be guaranteed"
+)
 class TestRunAllTests(ValidateAPI):
     """ Class to test that each validator test gets run
 
@@ -98,7 +103,7 @@ def validate_first(self, obj, param):
     def validate_second(self, obj, param):
         self.run_tests.append('second')
 
-
-def teardown():
-    # Check that both validate_xxx tests got run
-    assert TestRunAllTests.run_tests == ['first', 'second']
+    @classmethod
+    def teardown_class(cls):
+        # Check that both validate_xxx tests got run
+        assert cls.run_tests == ['first', 'second']

setup.cfg

@@ -24,6 +24,7 @@ test =
     pytest-cov
     pytest-doctestplus
     pytest-httpserver
+    pytest-xdist
 zstd =
     pyzstd >= 0.14.3
 all =

tools/ci/check.sh

@@ -25,7 +25,7 @@ elif [ "${CHECK_TYPE}" == "test" ]; then
     cd for_testing
     cp ../.coveragerc .
     pytest --doctest-modules --doctest-plus --cov nibabel --cov-report xml \
-        --junitxml=test-results.xml -v --pyargs nibabel
+        --junitxml=test-results.xml -v --pyargs nibabel -n auto
 else
     false
 fi