Moved temporary_data_dir fixture to conftest.py since it is a generic…

… fixture that may be useful to multiple test scripts

src/tests/conftest.py

@@ -0,0 +1,38 @@
+import os
+import shutil
+from pathlib import Path
+
+import pytest
+
+
+@pytest.fixture(scope="module")
+def temporary_data_dir(request) -> Path:
+    """
+    Create a temporary directory for test data and delete it after test end.
+
+    The temporary directory is created in the working directory and it is
+    named "temp_test_data_folder".
+    The fixture uses a finalizer that deletes the temporary directory where
+    every test data was saved. Therefore every time the user calls tests that
+    use this fixture (and save data inside the returned directory), at the end
+    of the test the finalizer deletes this directory.
+
+    Parameters
+    ----------
+
+    Returns
+    -------
+    Path
+        Path where every temporary file used by tests is saved.
+    """
+    temp_data_dir = Path(os.getcwd()) / "temp_test_data_folder"
+    try:
+        os.mkdir(temp_data_dir)
+    except FileExistsError:
+        pass
+
+    def remove_temp_dir_created():
+        shutil.rmtree(temp_data_dir)
+
+    request.addfinalizer(remove_temp_dir_created)
+    return temp_data_dir