diff --git a/mythril/disassembler/asm.py b/mythril/disassembler/asm.py
index 8eca0c8e..6308b5d8 100644
--- a/mythril/disassembler/asm.py
+++ b/mythril/disassembler/asm.py
@@ -42,7 +42,7 @@ def get_opcode_from_name(operation_name):
     raise RuntimeError("Unknown opcode")
 
 
-def find_op_code_sequence(pattern, instruction_list) -> Generator[int, None, None]:
+def find_op_code_sequence(pattern, instruction_list):
     """
     Returns all indices in instruction_list that point to instruction sequences following a pattern
     :param pattern: The pattern to look for.
diff --git a/tests/disassembler/__init__.py b/tests/disassembler/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/disassembler/asm.py b/tests/disassembler/asm.py
new file mode 100644
index 00000000..4eaada3f
--- /dev/null
+++ b/tests/disassembler/asm.py
@@ -0,0 +1,20 @@
+from mythril.disassembler.asm import *
+import pytest
+
+valid_names = [("PUSH1", 0x60), ("STOP", 0x0), ("RETURN", 0xf3)]
+
+
+@pytest.mark.parametrize("operation_name, hex_value", valid_names)
+def test_get_opcode(operation_name: str, hex_value: int):
+    # Act
+    return_value = get_opcode_from_name(operation_name)
+    # Assert
+    assert return_value == hex_value
+
+
+def test_get_unknown_opcode():
+    operation_name = "definitely unknown"
+
+    # Act
+    with pytest.raises(RuntimeError):
+        get_opcode_from_name(operation_name)