You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: json_binary_test.go
    path of file: ./repos/tidb/pkg/types
    
    the code of the file until where you have to start completion: // Copyright 2017 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance wi
    
func TestBinaryJSONModify(t *testing.T) {
	var tests = []struct {
		base     string
		setField string
		setValue string
		expected string
		success  bool
		mt       JSONModifyType
	}{
		{`null`, "$", `{}`, `{}`, true, JSONModifySet},
		{`{}`, "$.a", `3`, `{"a": 3}`, true, JSONModifySet},
		{`{"a": 3}`, "$.a", `[]`, `{"a": []}`, true, JSONModifyReplace},
		{`{"a": 3}`, "$.b", `"3"`, `{"a": 3, "b": "3"}`, true, JSONModifySet},
		{`{"a": []}`, "$.a[0]", `3`, `{"a": [3]}`, true, JSONModifySet},
		{`{"a": [3]}`, "$.a[1]", `4`, `{"a": [3, 4]}`, true, JSONModifyInsert},
		{`{"a": [3]}`, "$[0]", `4`, `4`, true, JSONModifySet},
		{`{"a": [3]}`, "$[1]", `4`, `[{"a": [3]}, 4]`, true, JSONModifySet},
		{`{"b": true}`, "$.b", `false`, `{"b": false}`, true, JSONModifySet},

		// These tests illustrate the differences among the three JSONModifyType
		{`{"foo": "bar"}`, "$.foo", `"moo"`, `{"foo": "bar"}`, true, JSONModifyInsert},
		{`{"foo": "bar"}`, "$.foo", `"moo"`, `{"foo": "moo"}`, true, JSONModifyReplace},
		{`{"foo": "bar"}`, "$.foo", `"moo"`, `{"foo": "moo"}`, true, JSONModifySet},
		{`{"foo": "bar"}`, "$.foo", `null`, `{"foo": null}`, true, JSONModifySet},
		{`{"foo": "bar"}`, "$.baz", `"moo"`, `{"foo": "bar", "baz": "moo"}`, true, JSONModifyInsert},
		{`{"foo": "bar"}`, "$.baz", `"moo"`, `{"foo": "bar"}`, true, JSONModifyReplace},
		{`{"foo": "bar"}`, "$.baz", `"moo"`, `{"foo": "bar", "baz": "moo"}`, true, JSONModifySet},
		{`{"foo": "bar"}`, "$.baz", `null`, `{"foo": "bar", "baz": null}`, true, JSONModifySet},

		// nothing changed because the path is empty and we want to insert.
		{`{}`, "$", `1`, `{}`, true, JSONModifyInsert},
		// nothing changed because the path without last leg doesn't exist.
		{`{"a": [3, 4]}`, "$.b[1]", `3`, `{"a": [3, 4]}`, true, JSONModifySet},
		// nothing changed because the path without last leg doesn't exist.
		{`{"a": [3, 4]}`, "$.a[2].b", `3`, `{"a": [3, 4]}`, true, JSONModifySet},
		// nothing changed because we want to insert but the full path exists.
		{`{"a": [3, 4]}`, "$.a[0]", `30`, `{"a": [3, 4]}`, true, JSONModifyInsert},
		// nothing changed because we want to replace but the full path doesn't exist.
		{`{"a": [3, 4]}`, "$.a[2]", `30`, `{"a": [3, 4]}`, true, JSONModifyReplace},

		// bad path expression.
		{"null", "$.*", "{}", "null", false, JSONModifySet},
		{"null", "$[*]", "{}", "null", false, JSONModifySet},
		{"null", "$**.a", "{}", "null", false, JSONModifySet},
		{"null", "$**[3]", "{}", "null", false, JSONModifySet},
	}

	for _, test := range tests {
		pathExpr, err := ParseJSONPathExpr(test.setField)
		require.NoError(t, err)

		base := mustParseBinaryFromString(t, test.base)
		value := mustParseBinaryFromString(t, test.setValue)
		expected := mustParseBinaryFromString(t, test.expected)
		obtain, err := base.Modify([]JSONPathExpression{pathExpr}, []BinaryJSON{value}, test.mt)
		if test.success {
			require.NoError(t, err)
			require.Equal(t, expected.String(), obtain.String())
		} else {
			require.Error(t, err)
		}
	}
}