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package slogtest_test
import (
"bytes"
"encoding/json"
"fmt"
"golang.org/x/exp/slog"
"golang.org/x/exp/slog/slogtest"
)
// This example demonstrates one technique for testing a handler with this
// package. The handler is given a [bytes.Buffer] to write to, and each line
// of the resulting output is parsed.
// For JSON output, [encoding/json.Unmarshal] produces a result in the desired
// format when given a pointer to a map[string]any.
func Example_parsing() {
var buf bytes.Buffer
h := slog.NewJSONHandler(&buf, nil)
results := func() []map[string]any {
var ms []map[string]any
for _, line := range bytes.Split(buf.Bytes(), []byte{'\n'}) {
if len(line) == 0 {
continue
}
var m map[string]any
if err := json.Unmarshal(line, &m); err != nil {
panic(err) // In a real test, use t.Fatal.
}
ms = append(ms, m)
}
return ms
}
err := slogtest.TestHandler(h, results)
fmt.Println(err)
// Output:
// <nil>
}
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