session pytest setup

Signed-off-by: Jose Borreguero <[email protected]>

.github/workflows/actions.yml

@@ -40,8 +40,6 @@ jobs:
     - name: Test with pytest
       working-directory: ./reduction
       run: |
-        echo datasearch.directories=/home/cloud/_work/LiquidsReflectometer/LiquidsReflectometer/reduction/tests/data/liquidsreflectometer-data/nexus/ >> ~/.mantid/Mantid.user.properties
-        cat ~/.mantid/Mantid.user.properties
         git submodule add --force https://code.ornl.gov/sns-hfir-scse/infrastructure/test-data/liquidsreflectometer-data.git tests/data/liquidsreflectometer-data
         git submodule update --init
         python -m pytest --cov=. --cov-report=xml --cov-report=term test

reduction/test/conftest.py

@@ -0,0 +1,20 @@
+# standard imports
+import logging
+from pathlib import Path
+import os
+
+data_dir = Path(__file__).parent.parent / "data"
+
+
+def pytest_sessionstart(session):
+    r"""invoked by pytest at the very beginning"""
+    logger = logging.getLogger()
+    # Insert data directory in Mantid config file
+    mantid_config_dir = Path(os.environ["HOME"]) / ".mantid"
+    os.makedirs(str(mantid_config_dir), exist_ok=True)  # create directory if it doesn't exists
+    mantid_config_file = mantid_config_dir / "Mantid.user.properties"
+    write_mode = "a" if mantid_config_file.exists() else "w"  # append or create-then-write
+    with open(mantid_config_file, write_mode) as file_handle:
+        data_path = data_dir / "liquidsreflectometer-data" / "nexus"
+        file_handle.write(f"datasearch.directories={str(data_path)}")
+        logger.info("Appending data directory to mantid config file")