change warning catch

tests/quam_base/referencing/test_quam_root_referencing.py

@@ -1,5 +1,5 @@
 from quam import QuamRoot, QuamComponent, quam_dataclass
-import pytest
+import warnings
 
 
 @quam_dataclass
@@ -14,23 +14,19 @@ class Root(QuamRoot):
 
 
 def test_quam_root_reference():
-    with pytest.warns(None) as record:
+    with warnings.catch_warnings():
+        warnings.simplefilter("error")
         root = Root(a=Component())
         assert root.a is root.b
 
-    # Ensure no warnings were raised
-    assert len(record) == 0
-
 
 def test_quam_root_reference_to_dict():
-    with pytest.warns(None) as record:
+    with warnings.catch_warnings():
+        warnings.simplefilter("error")
         root = Root(a="#/b", b=Component())
         d = root.to_dict()
         assert d == {
             "a": "#/b",
             "b": {},
             "__class__": "test_quam_root_referencing.Root",
         }
-
-    # Ensure no warnings were raised
-    assert len(record) == 0