moving TODO string in a more elegant place

pennylane_lightning/lightning_tensor/lightning_tensor.py

@@ -66,9 +66,7 @@ class LightningTensor(Device):
             statistics like expectation values and variances is performed analytically.
         c_dtype: Datatypes for the tensor representation. Must be one of
             ``np.complex64`` or ``np.complex128``.
-        **kwargs: keyword arguments. The following options are supported:
-
-            # TODO add when cuTensorNet MPS backend is available as a prototype
+        **kwargs: keyword arguments. TODO add when cuTensorNet MPS backend is available as a prototype.
     """
 
     # pylint: disable=too-many-instance-attributes
@@ -105,6 +103,8 @@ def __init__(
         self._method = method
         self._c_dtype = c_dtype
 
+        self._interface = None
+
         for arg in kwargs:
             if arg not in self._device_options:
                 raise TypeError(

tests/lightning_tensor/test_lightning_tensor.py

@@ -68,16 +68,13 @@ def test_invalid_method(method):
 
 def test_invalid_keyword_arg():
     """Test an invalid keyword argument."""
-    with pytest.raises(
-        TypeError,
-        match=f"Unexpected argument: fake_arg during initialization of the lightning.tensor device.",
-    ):
+    with pytest.raises(TypeError):
         LightningTensor(fake_arg=None)
 
 
 def test_invalid_shots():
     """Test that an error is raised if finite number of shots are requestd."""
-    with pytest.raises(ValueError, match="lightning.tensor does not support finite shots."):
+    with pytest.raises(ValueError):
         LightningTensor(shots=5)