Selfhosted GPU tests restricted to GPU backends only

selfhosted

@@ -8,7 +8,7 @@ cp -r tests $tmpdir
 cp pyproject.toml $tmpdir
 cd $tmpdir/tests
 source /nfs/users/github/actions-runner/_work/qibo/qibo/testenv/bin/activate
-pytest
+pytest --gpu-only
 pytest_status=$?
 if [[ $pytest_status -ne 0 ]]
     then

tests/conftest.py

@@ -10,6 +10,16 @@
 
 from qibo.backends import _Global, construct_backend
 
+
+def pytest_addoption(parser):
+    parser.addoption(
+        "--gpu-only",
+        action="store_true",
+        default=False,
+        help="Run on GPU backends only.",
+    )
+
+
 # backends to be tested
 BACKENDS = [
     "numpy",
@@ -71,7 +81,10 @@ def pytest_configure(config):
 
 
 @pytest.fixture
-def backend(backend_name):
+def backend(backend_name, request):
+    if request.config.getoption("--gpu-only"):  # pragma: no cover
+        if backend_name not in ("cupy", "cuquantum"):
+            pytest.skip("Skipping non-gpu backend.")
     yield get_backend(backend_name)