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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package slog_test
import (
"bytes"
"encoding/json"
"fmt"
"io"
"log/slog"
"strings"
"testing"
"testing/slogtest"
)
func TestSlogtest(t *testing.T) {
for _, test := range []struct {
name string
new func(io.Writer) slog.Handler
parse func([]byte) (map[string]any, error)
}{
{"JSON", func(w io.Writer) slog.Handler { return slog.NewJSONHandler(w, nil) }, parseJSON},
{"Text", func(w io.Writer) slog.Handler { return slog.NewTextHandler(w, nil) }, parseText},
} {
t.Run(test.name, func(t *testing.T) {
var buf bytes.Buffer
h := test.new(&buf)
results := func() []map[string]any {
ms, err := parseLines(buf.Bytes(), test.parse)
if err != nil {
t.Fatal(err)
}
return ms
}
if err := slogtest.TestHandler(h, results); err != nil {
t.Fatal(err)
}
})
}
}
func parseLines(src []byte, parse func([]byte) (map[string]any, error)) ([]map[string]any, error) {
var records []map[string]any
for _, line := range bytes.Split(src, []byte{'\n'}) {
if len(line) == 0 {
continue
}
m, err := parse(line)
if err != nil {
return nil, fmt.Errorf("%s: %w", string(line), err)
}
records = append(records, m)
}
return records, nil
}
func parseJSON(bs []byte) (map[string]any, error) {
var m map[string]any
if err := json.Unmarshal(bs, &m); err != nil {
return nil, err
}
return m, nil
}
// parseText parses the output of a single call to TextHandler.Handle.
// It can parse the output of the tests in this package,
// but it doesn't handle quoted keys or values.
// It doesn't need to handle all cases, because slogtest deliberately
// uses simple inputs so handler writers can focus on testing
// handler behavior, not parsing.
func parseText(bs []byte) (map[string]any, error) {
top := map[string]any{}
s := string(bytes.TrimSpace(bs))
for len(s) > 0 {
kv, rest, _ := strings.Cut(s, " ") // assumes exactly one space between attrs
k, value, found := strings.Cut(kv, "=")
if !found {
return nil, fmt.Errorf("no '=' in %q", kv)
}
keys := strings.Split(k, ".")
// Populate a tree of maps for a dotted path such as "a.b.c=x".
m := top
for _, key := range keys[:len(keys)-1] {
x, ok := m[key]
var m2 map[string]any
if !ok {
m2 = map[string]any{}
m[key] = m2
} else {
m2, ok = x.(map[string]any)
if !ok {
return nil, fmt.Errorf("value for %q in composite key %q is not map[string]any", key, k)
}
}
m = m2
}
m[keys[len(keys)-1]] = value
s = rest
}
return top, nil
}