Test changes to account for 0.39 deprecations (#912)

Updating some tests to account for various deprecations happening in pennylane for v0.39. --------- Co-authored-by: ringo-but-quantum <github-ringo-but-quantum@xanadu.ai>
PennyLaneAI · Sep 17, 2024 · 3718dd6 · 3718dd6
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diff --git a/.github/CHANGELOG.md b/.github/CHANGELOG.md
@@ -31,6 +31,9 @@
 
 ### Improvements
 
+* Update the test suite to remove deprecated code.
+  [(#912)](https://github.com/PennyLaneAI/pennylane-lightning/pull/912)
+
 * Skip the compilation of Lightning simulators and development requirements to boost the build of public docs up to 5x.
   [(#904)](https://github.com/PennyLaneAI/pennylane-lightning/pull/904)
 
@@ -75,7 +78,7 @@
 
 This release contains contributions from (in alphabetical order):
 
-Ali Asadi, Amintor Dusko, Luis Alfredo Nuñez Meneses, Vincent Michaud-Rioux, Lee J. O'Riordan, Shuli Shu
+Ali Asadi, Amintor Dusko, Luis Alfredo Nuñez Meneses, Vincent Michaud-Rioux, Lee J. O'Riordan, Mudit Pandey, Shuli Shu
 
 ---
 

diff --git a/mpitests/test_adjoint_jacobian.py b/mpitests/test_adjoint_jacobian.py
@@ -1378,7 +1378,7 @@ def circuit(params):
 def test_qubit_unitary(dev, n_targets):
     """Tests that ``qml.QubitUnitary`` can be included in circuits differentiated with the adjoint method."""
     n_wires = len(dev.wires)
-    dev_def = qml.device("default.qubit.legacy", wires=n_wires)
+    dev_def = qml.device("default.qubit", wires=n_wires)
     h = 1e-3 if dev.R_DTYPE == np.float32 else 1e-7
     c_dtype = np.complex64 if dev.R_DTYPE == np.float32 else np.complex128
 
@@ -1396,7 +1396,7 @@ def test_qubit_unitary(dev, n_targets):
 
     init_state = np.array(init_state, requires_grad=False, dtype=c_dtype)
     U = np.array(U, requires_grad=False, dtype=c_dtype)
-    obs = qml.operation.Tensor(*(qml.PauliZ(i) for i in range(n_wires)))
+    obs = qml.prod(*(qml.PauliZ(i) for i in range(n_wires)))
 
     def circuit(x):
         qml.StatePrep(init_state, wires=range(n_wires))
@@ -1444,7 +1444,7 @@ def test_diff_qubit_unitary(dev, n_targets):
 
     init_state = np.array(init_state, requires_grad=False, dtype=c_dtype)
     U = np.array(U, requires_grad=False, dtype=c_dtype)
-    obs = qml.operation.Tensor(*(qml.PauliZ(i) for i in range(n_wires)))
+    obs = qml.prod(*(qml.PauliZ(i) for i in range(n_wires)))
 
     def circuit(x, u_mat):
         qml.StatePrep(init_state, wires=range(n_wires))

diff --git a/pennylane_lightning/core/_version.py b/pennylane_lightning/core/_version.py
@@ -16,4 +16,4 @@
    Version number (major.minor.patch[-label])
 """
 
-__version__ = "0.39.0-dev24"
+__version__ = "0.39.0-dev25"
diff --git a/tests/test_adjoint_jacobian.py b/tests/test_adjoint_jacobian.py
@@ -1544,7 +1544,7 @@ def test_qubit_unitary(n_targets):
     """Tests that ``qml.QubitUnitary`` can be included in circuits differentiated with the adjoint method."""
     n_wires = 6
     dev = qml.device(device_name, wires=n_wires)
-    dev_def = qml.device("default.qubit.legacy", wires=n_wires)
+    dev_def = qml.device("default.qubit", wires=n_wires)
 
     np.random.seed(1337)
     init_state = np.random.rand(2**n_wires) + 1j * np.random.rand(2**n_wires)