PhpParser\NodeAbstractTest::testJsonSerialization PHP Method

    public function testJsonSerialization()
    {
        $code = <<<'PHP'
<?php
// comment
/** doc comment */
function functionName(&$a = 0, $b = 1.0) {
    echo 'Foo';
}
PHP;
        $expected = <<<'JSON'
[
    {
        "nodeType": "Stmt_Function",
        "byRef": false,
        "name": "functionName",
        "params": [
            {
                "nodeType": "Param",
                "type": null,
                "byRef": true,
                "variadic": false,
                "name": "a",
                "default": {
                    "nodeType": "Scalar_LNumber",
                    "value": 0,
                    "attributes": {
                        "startLine": 4,
                        "endLine": 4,
                        "kind": 10
                    }
                },
                "attributes": {
                    "startLine": 4,
                    "endLine": 4
                }
            },
            {
                "nodeType": "Param",
                "type": null,
                "byRef": false,
                "variadic": false,
                "name": "b",
                "default": {
                    "nodeType": "Scalar_DNumber",
                    "value": 1,
                    "attributes": {
                        "startLine": 4,
                        "endLine": 4
                    }
                },
                "attributes": {
                    "startLine": 4,
                    "endLine": 4
                }
            }
        ],
        "returnType": null,
        "stmts": [
            {
                "nodeType": "Stmt_Echo",
                "exprs": [
                    {
                        "nodeType": "Scalar_String",
                        "value": "Foo",
                        "attributes": {
                            "startLine": 5,
                            "endLine": 5,
                            "kind": 1
                        }
                    }
                ],
                "attributes": {
                    "startLine": 5,
                    "endLine": 5
                }
            }
        ],
        "attributes": {
            "startLine": 4,
            "comments": [
                {
                    "nodeType": "Comment",
                    "text": "\/\/ comment\n",
                    "line": 2,
                    "filePos": 6
                },
                {
                    "nodeType": "Comment_Doc",
                    "text": "\/** doc comment *\/",
                    "line": 3,
                    "filePos": 17
                }
            ],
            "endLine": 6
        }
    }
]
JSON;
        $parser = new Parser\Php7(new Lexer());
        $stmts = $parser->parse(canonicalize($code));
        $json = json_encode($stmts, JSON_PRETTY_PRINT);
        $this->assertEquals(canonicalize($expected), canonicalize($json));
    }