Let pytest run from root dir

Author: rmjarvis

pyproject.toml

@@ -1,2 +1,7 @@
 [build-system]
 requires = ["setuptools>=38", "wheel", "pybind11>=2.2,<3", 'numpy>=1.17']
+
+[tool.pytest.ini_options]
+testpaths = [
+    "tests",
+]

tests/conftest.py

@@ -1,3 +1,10 @@
+import pytest
+
 def pytest_collectstart(collector):
     if hasattr(collector, 'skip_compare'):
         collector.skip_compare += 'stderr',
+
+# cf. https://stackoverflow.com/questions/62044541/change-pytest-working-directory-to-test-case-directory
+@pytest.fixture(autouse=True)
+def change_test_dir(request, monkeypatch):
+    monkeypatch.chdir(request.fspath.dirname)