Add config file for pytest

python/test/conftest.py

@@ -0,0 +1,17 @@
+# content of conftest.py
+import pytest
+
+
+def pytest_addoption(parser):
+    parser.addoption(
+        "--all", action="store_true", help="Run all back-ends"
+    )
+
+
+def pytest_generate_tests(metafunc):
+    if "backend" in metafunc.fixturenames:
+        if metafunc.config.getoption("all"):
+            backends = ['hdf5', 'text']
+        else:
+            backends = ['text']
+        metafunc.parametrize("backend", backends)