add test and fix typo

pennylane/ops/functions/equal.py

@@ -617,7 +617,7 @@ def _equal_tensor(op1: Tensor, op2: Observable, **kwargs):
         return f"{op2} is not of type Observable"
 
     if isinstance(op2, (Hamiltonian, LinearCombination, Hermitian)):
-        return op2.compare(op1) or f"{op1} and {op2} are not same"
+        return op2.compare(op1) or f"{op1} and {op2} are not the same"
 
     if isinstance(op2, Tensor):
         return (
@@ -636,7 +636,7 @@ def _equal_hamiltonian(op1: Hamiltonian, op2: Observable, **kwargs):
         return f"{op2} is not of type Observable"
 
     if not op1.compare(op2):
-        return f"'{op1}' and '{op2}' are not same"
+        return f"'{op1}' and '{op2}' are not the same"
 
     return True
 

tests/ops/functions/test_equal.py

@@ -1522,6 +1522,15 @@ def test_tensor_and_operation_not_equal(self):
         with pytest.raises(AssertionError, match="is not of type Observable"):
             assert_equal(op1, op2)
 
+    def test_tensor_and_observable_not_equal(self):
+        """Tests that comparing a Tensor with an Observable that is not a Tensor returns False"""
+        op1 = qml.PauliX(0) @ qml.PauliY(1)
+        op2 = qml.Z(0)
+        assert qml.equal(op1, op2) is False
+        assert qml.equal(op2, op1) is False
+        with pytest.raises(AssertionError, match="is of type <class 'pennylane.operation.Tensor'>"):
+            assert_equal(op1, op2)
+
     def test_tensor_and_unsupported_observable_returns_false(self):
         """Tests that trying to compare a Tensor to something other than another Tensor or a Hamiltonian returns False"""
         op1 = qml.PauliX(0) @ qml.PauliY(1)