mediocre-go-lib/mlog/mlog_test.go

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package mlog
import (
"bytes"
"context"
"errors"
"fmt"
"strings"
. "testing"
"time"
"github.com/mediocregopher/mediocre-go-lib/v2/mctx"
"github.com/mediocregopher/mediocre-go-lib/v2/mtest/massert"
)
func TestTruncate(t *T) {
massert.Require(t,
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massert.Equal("abc", Truncate("abc", 4)),
massert.Equal("abc", Truncate("abc", 3)),
massert.Equal("ab...", Truncate("abc", 2)),
)
}
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func TestLogger(t *T) {
buf := new(bytes.Buffer)
now := time.Now().UTC()
td, ts := now.Format(msgTimeFormat), fmt.Sprint(now.UnixNano())
l := NewLogger(&LoggerOpts{
MessageHandler: NewMessageHandler(buf),
Now: func() time.Time { return now },
})
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assertOut := func(expected string) massert.Assertion {
expected = strings.ReplaceAll(expected, "<TD>", td)
expected = strings.ReplaceAll(expected, "<TS>", ts)
out, err := buf.ReadString('\n')
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return massert.All(
massert.Nil(err),
massert.Equal(expected, strings.TrimSpace(out)),
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)
}
ctx := context.Background()
// Default max level should be INFO
l.Debug(ctx, "foo")
l.Info(ctx, "bar")
l.Warn(ctx, "baz", errors.New("ERR"))
l.Error(ctx, "buz", errors.New("ERR"))
massert.Require(t,
assertOut(`{"td":"<TD>","ts":<TS>,"level":"INFO","descr":"bar","level_int":30}`),
assertOut(`{"td":"<TD>","ts":<TS>,"level":"WARN","descr":"baz","level_int":20,"annotations":{"errMsg":"ERR"}}`),
assertOut(`{"td":"<TD>","ts":<TS>,"level":"ERROR","descr":"buz","level_int":10,"annotations":{"errMsg":"ERR"}}`),
)
// annotate context
ctx = mctx.Annotate(ctx, "foo", "bar")
l.Info(ctx, "bar")
massert.Require(t,
assertOut(`{"td":"<TD>","ts":<TS>,"level":"INFO","descr":"bar","level_int":30,"annotations":{"foo":"bar"}}`),
)
// add namespace
l = l.WithNamespace("ns")
l.Info(ctx, "bar")
massert.Require(t,
assertOut(`{"td":"<TD>","ts":<TS>,"level":"INFO","ns":["ns"],"descr":"bar","level_int":30,"annotations":{"foo":"bar"}}`),
)
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}