TST: Add blank files, make available for doctests

Author: mgxd

niworkflows/interfaces/conftest.py

@@ -0,0 +1,40 @@
+from pathlib import Path
+from shutil import copytree
+
+import pytest
+
+try:
+    from contextlib import chdir as _chdir
+except ImportError:  # PY310
+    import os
+    from contextlib import contextmanager
+
+    @contextmanager  # type: ignore
+    def _chdir(path):
+        cwd = os.getcwd()
+        os.chdir(path)
+        try:
+            yield
+        finally:
+            os.chdir(cwd)
+
+
+@pytest.fixture(scope="module")
+def data_dir():
+    return Path(__file__).parent / "tests" / "data"
+
+
+@pytest.fixture(autouse=True)
+def _docdir(request, tmp_path):
+    # Trigger ONLY for the doctests.
+    doctest_plugin = request.config.pluginmanager.getplugin("doctest")
+    if isinstance(request.node, doctest_plugin.DoctestItem):
+        copytree(Path(__file__).parent / "tests" / "data", tmp_path, dirs_exist_ok=True)
+
+        # Chdir only for the duration of the test.
+        with _chdir(tmp_path):
+            yield
+
+    else:
+        # For normal tests, we have to yield, since this is a yield-fixture.
+        yield