{
    "single selector": {
        "source": "test",
        "ast": {
            "type": "SelectorList",
            "children": [
                {
                    "type": "Selector",
                    "children": [
                        {
                            "type": "TypeSelector",
                            "name": "test"
                        }
                    ]
                }
            ]
        }
    },
    "several selectors": {
        "source": "a+b,c",
        "ast": {
            "type": "SelectorList",
            "children": [
                {
                    "type": "Selector",
                    "children": [
                        {
                            "type": "TypeSelector",
                            "name": "a"
                        },
                        {
                            "type": "Combinator",
                            "name": "+"
                        },
                        {
                            "type": "TypeSelector",
                            "name": "b"
                        }
                    ]
                },
                {
                    "type": "Selector",
                    "children": [
                        {
                            "type": "TypeSelector",
                            "name": "c"
                        }
                    ]
                }
            ]
        }
    },
    "error": [
        {
            "source": "a, ",
            "offset": "  ^",
            "error": "Selector is expected"
        },
        {
            "source": "a,, ",
            "offset": "  ^",
            "error": "Selector is expected"
        },
        {
            "source": "a,,b",
            "offset": "  ^",
            "error": "Selector is expected"
        },
        {
            "source": ",b",
            "offset": "^",
            "error": "Selector is expected"
        },
        {
            "source": ",,b",
            "offset": "^",
            "error": "Selector is expected"
        },
        {
            "source": ",",
            "offset": "^",
            "error": "Selector is expected"
        },
        {
            "source": ",,",
            "offset": "^",
            "error": "Selector is expected"
        },
        {
            "source": "a,{",
            "offset": "  ^",
            "error": "Selector is expected"
        }
    ]
}