1// Copyright 2023 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package slogtest_test
6
7import (
8	"bytes"
9	"encoding/json"
10	"log"
11	"log/slog"
12	"testing/slogtest"
13)
14
15// This example demonstrates one technique for testing a handler with this
16// package. The handler is given a [bytes.Buffer] to write to, and each line
17// of the resulting output is parsed.
18// For JSON output, [encoding/json.Unmarshal] produces a result in the desired
19// format when given a pointer to a map[string]any.
20func Example_parsing() {
21	var buf bytes.Buffer
22	h := slog.NewJSONHandler(&buf, nil)
23
24	results := func() []map[string]any {
25		var ms []map[string]any
26		for _, line := range bytes.Split(buf.Bytes(), []byte{'\n'}) {
27			if len(line) == 0 {
28				continue
29			}
30			var m map[string]any
31			if err := json.Unmarshal(line, &m); err != nil {
32				panic(err) // In a real test, use t.Fatal.
33			}
34			ms = append(ms, m)
35		}
36		return ms
37	}
38	err := slogtest.TestHandler(h, results)
39	if err != nil {
40		log.Fatal(err)
41	}
42
43	// Output:
44}
45