Add better testing

src/cfnlint/context/_mappings.py

@@ -32,7 +32,7 @@ def create_from_dict(cls, instance: Any) -> Mappings:
             for k, v in instance.items():
                 if k == "Fn::Transform":
                     is_transform = True
-                else:
+                elif isinstance(k, str):
                     result[k] = Map.create_from_dict(v)
             return cls(result, is_transform)
         except (ValueError, AttributeError) as e:
@@ -95,6 +95,6 @@ def create_from_dict(cls, instance: Any) -> Map:
         for k, v in instance.items():
             if k == "Fn::Transform":
                 is_transform = True
-            else:
+            elif isinstance(k, str):
                 keys[k] = _MappingSecondaryKey.create_from_dict(v)
         return cls(keys, is_transform)

test/unit/module/jsonschema/test_resolvers_cfn.py

@@ -246,7 +246,8 @@ def test_invalid_functions(name, instance, response):
                     ValidationError(
                         (
                             "'bar' is not one of ['foo', "
-                            "'transformFirstKey', 'transformSecondKey']"
+                            "'transformFirstKey', 'transformSecondKey', "
+                            "'integers']"
                         ),
                         path=deque(["Fn::FindInMap", 0]),
                     ),
@@ -306,6 +307,11 @@ def test_invalid_functions(name, instance, response):
                 )
             ],
         ),
+        (
+            "Valid FindInMap with integer types",
+            {"Fn::FindInMap": ["integers", 1, 2]},
+            [("Value", deque(["Mappings", "integers", "1", "2"]), None)],
+        ),
         (
             "Valid FindInMap with a bad second key and default",
             {"Fn::FindInMap": ["foo", "first", "third", {"DefaultValue": "default"}]},
@@ -340,6 +346,7 @@ def test_valid_functions(name, instance, response):
                 "foo": {"first": {"second": "bar"}},
                 "transformFirstKey": {"Fn::Transform": {"second": "bar"}},
                 "transformSecondKey": {"first": {"Fn::Transform": "bar"}},
+                "integers": {"1": {"2": "Value"}},
             }
         )
     )

test/unit/rules/functions/test_basefn.py

@@ -56,6 +56,36 @@ def rule():
                 )
             ],
         ),
+        (
+            "Errors with context error",
+            {"Fn::Sub": "Bar"},
+            {"anyOf": [{"enum": ["Foo"]}]},
+            [
+                ValidationError(
+                    message=(
+                        "{'Fn::Sub': 'Bar'} is not valid "
+                        "under any of the given schemas "
+                        "when '' is resolved"
+                    ),
+                    path=deque(["Fn::Sub"]),
+                    validator="",
+                    schema_path=deque(["anyOf"]),
+                    rule=_ChildRule(),
+                    context=[
+                        ValidationError(
+                            message=(
+                                "{'Fn::Sub': 'Bar'} is not one of "
+                                "['Foo'] when '' is resolved"
+                            ),
+                            path=deque([]),
+                            validator="enum",
+                            schema_path=deque([0, "enum"]),
+                            rule=_ChildRule(),
+                        )
+                    ],
+                )
+            ],
+        ),
     ],
 )
 def test_resolve(name, instance, schema, expected, validator, rule):