raise type error for bad adapter circuit conversion input type

qiskit_braket_provider/providers/adapter.py

@@ -416,6 +416,11 @@ def convert_qiskit_to_braket_circuit(circuit: QuantumCircuit) -> Circuit:
     Returns:
         Circuit: Braket circuit
     """
+    if not isinstance(circuit, QuantumCircuit):
+        raise TypeError(
+            f"Expected a qiskit.QuantumCircuit, got {type(circuit)} instead"
+        )
+
     quantum_circuit = Circuit()
     if not (
         {gate.name for gate, _, _ in circuit.data}.issubset(translatable_qiskit_gates)

tests/providers/test_adapter.py

@@ -1,6 +1,8 @@
 """Tests for Qiskti to Braket adapter."""
 from unittest import TestCase
+from unittest.mock import Mock
 
+import pytest
 from braket.circuits import Circuit, FreeParameter, observables
 from braket.devices import LocalSimulator
 
@@ -134,6 +136,16 @@
 class TestAdapter(TestCase):
     """Tests adapter."""
 
+    def test_raise_type_error_for_bad_input(self):
+        """Test raising TypeError if adapter does not receive a qiskit.QuantumCircuit."""
+        circuit = Mock()
+
+        message = (
+            "Expected a qiskit.QuantumCircuit, got <class 'unittest.mock.Mock'> instead"
+        )
+        with pytest.raises(TypeError, match=message):
+            convert_qiskit_to_braket_circuit(circuit)
+
     def test_state_preparation_01(self):
         """Tests state_preparation handling of Adapter"""
         input_state_vector = np.array([np.sqrt(3) / 2, np.sqrt(2) * complex(1, 1) / 4])