Parameter of list<number> can have an integer default (#3372)

Author: kddejong

src/cfnlint/context/context.py

@@ -304,9 +304,16 @@ def __post_init__(self, parameter) -> None:
 
         if self.type == "CommaDelimitedList" or self.type.startswith("List<"):
             if "Default" in parameter:
-                self.default = parameter.get("Default", "").split(",")
+                default = parameter.get("Default", "")
+                if isinstance(default, str):
+                    self.default = default.split(",")
+                else:
+                    self.default = [default]
             for allowed_value in parameter.get("AllowedValues", []):
-                self.allowed_values.append(allowed_value.split(","))
+                if isinstance(allowed_value, str):
+                    self.allowed_values.append(allowed_value.split(","))
+                else:
+                    self.allowed_values.append([allowed_value])
         else:
             self.default = parameter.get("Default")
             self.allowed_values = parameter.get("AllowedValues")

test/unit/module/context/test_parameter.py

@@ -75,6 +75,18 @@
             "Number",
             [("10", deque(["MinValue"])), ("20", deque(["MaxValue"]))],
         ),
+        (
+            "Valid list parameter with an integer value",
+            {"Type": "List<Number>", "Default": 10},
+            "List<Number>",
+            [(["10"], deque(["Default"]))],
+        ),
+        (
+            "Valid list parameter with an integer value",
+            {"Type": "List<Number>", "AllowedValues": [10]},
+            "List<Number>",
+            [(["10"], deque(["AllowedValues", 0]))],
+        ),
     ],
 )
 def test_parameter(name, instance, expected_type, expected_ref):