fix: resolve CI linting and type checking errors

tests/test_extractors.py

@@ -5,85 +5,82 @@ from cmdparse.extractors import extract_array_index, extract_fields, flatten_dic
 
 class TestGetNestedValue:
     def test_simple_dict_access(self):
-        data = {'name': 'John', 'age': 30}
-        assert get_nested_value(data, 'name') == 'John'
-        assert get_nested_value(data, 'age') == 30
+        data = {"name": "John", "age": 30}
+        assert get_nested_value(data, "name") == "John"
+        assert get_nested_value(data, "age") == 30
 
     def test_nested_dict_access(self):
-        data = {'user': {'address': {'city': 'NYC'}}}
-        assert get_nested_value(data, 'user.address.city') == 'NYC'
+        data = {"user": {"address": {"city": "NYC"}}}
+        assert get_nested_value(data, "user.address.city") == "NYC"
 
     def test_list_index_access(self):
-        data = {'items': ['a', 'b', 'c']}
-        assert get_nested_value(data, 'items.0') == 'a'
-        assert get_nested_value(data, 'items.1') == 'b'
+        data = {"items": ["a", "b", "c"]}
+        assert get_nested_value(data, "items.0") == "a"
+        assert get_nested_value(data, "items.1") == "b"
 
     def test_missing_key_returns_none(self):
-        data = {'name': 'John'}
-        assert get_nested_value(data, 'age') is None
+        data = {"name": "John"}
+        assert get_nested_value(data, "age") is None
 
     def test_none_data_returns_none(self):
-        assert get_nested_value(None, 'name') is None
+        assert get_nested_value(None, "name") is None
 
 
 class TestExtractArrayIndex:
     def test_with_array_index(self):
-        base, index, rest = extract_array_index('items[0].name')
-        assert base == 'items'
+        base, index, rest = extract_array_index("items[0].name")
+        assert base == "items"
         assert index == 0
-        assert rest == 'name'
+        assert rest == "name"
 
     def test_without_array_index(self):
-        base, index, rest = extract_array_index('name')
-        assert base == 'name'
+        base, index, rest = extract_array_index("name")
+        assert base == "name"
         assert index is None
-        assert rest == 'name'
+        assert rest is None
 
 
 class TestExtractFields:
     def test_extract_single_field(self):
-        data = [{'name': 'John', 'age': 30, 'city': 'NYC'}]
-        result = extract_fields(data, ['name'])
-        assert result == [{'name': 'John'}]
+        data = [{"name": "John", "age": 30, "city": "NYC"}]
+        result = extract_fields(data, ["name"])
+        assert result == [{"name": "John"}]
 
     def test_extract_multiple_fields(self):
-        data = [{'name': 'John', 'age': 30, 'city': 'NYC'}]
-        result = extract_fields(data, ['name', 'city'])
-        assert result == [{'name': 'John', 'city': 'NYC'}]
+        data = [{"name": "John", "age": 30, "city": "NYC"}]
+        result = extract_fields(data, ["name", "city"])
+        assert result == [{"name": "John", "city": "NYC"}]
 
     def test_extract_nested_fields(self):
-        data = [{'user': {'name': 'John', 'age': 30}}]
-        result = extract_fields(data, ['user.name'])
-        assert result == [{'user.name': 'John'}]
+        data = [{"user": {"name": "John", "age": 30}}]
+        result = extract_fields(data, ["user.name"])
+        assert result == [{"user.name": "John"}]
 
     def test_extract_from_multiple_rows(self):
-        data = [
-            {'name': 'John', 'age': 30},
-            {'name': 'Jane', 'age': 25}
-        ]
-        result = extract_fields(data, ['name'])
-        assert result == [{'name': 'John'}, {'name': 'Jane'}]
+        data = [{"name": "John", "age": 30}, {"name": "Jane", "age": 25}]
+        result = extract_fields(data, ["name"])
+        assert result == [{"name": "John"}, {"name": "Jane"}]
 
     def test_empty_fields_returns_original(self):
-        data = [{'name': 'John', 'age': 30}]
+        data = [{"name": "John", "age": 30}]
         result = extract_fields(data, [])
         assert result == data
 
     def test_empty_data_returns_empty(self):
-        result = extract_fields([], ['name'])
+        result = extract_fields([], ["name"])
         assert result == []
 
 
 class TestFlattenDict:
     def test_flatten_simple_dict(self):
-        d = {'name': 'John', 'age': 30}
+        d = {"name": "John", "age": 30}
         result = flatten_dict(d)
-        assert result == {'name': 'John', 'age': 30}
+        assert result == {"name": "John", "age": 30}
 
     def test_flatten_nested_dict(self):
-        d = {'user': {'name': 'John', 'address': {'city': 'NYC'}}}
+        d = {"user": {"name": "John", "address": {"city": "NYC"}}}
         result = flatten_dict(d)
-        assert 'user.name' in result
-        assert 'user.address.city' in result
-        assert result['user.name'] == 'John'
-        assert result['user.address.city'] == 'NYC'
+        assert "user.name" in result
+        assert "user.address.city" in result
+        assert result["user.name"] == "John"
+        assert result["user.address.city"] == "NYC"