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// SPDX-FileCopyrightText: 2026 Stefan Majewsky <majewsky@gmx.net>
// SPDX-License-Identifier: Apache-2.0
package microprom_test
import (
"fmt"
"testing"
"go.xyrillian.de/gg/assert"
"go.xyrillian.de/gg/microprom"
)
func TestFormatLabels(t *testing.T) {
ms := microprom.NewMetricSet(microprom.SyntaxOpenMetricsV1, nil)
// the basic example from the documentation
names := microprom.NewLabelNames("foo", "hello")
labels := ms.FormatLabels(names, "bar", "world")
assert.Equal(t, labels, `foo="bar",hello="world"`)
// test escaping label values
labels = ms.FormatLabels(names, "bar\\\n\\bar", `"universe\world"`)
assert.Equal(t, labels, `foo="bar\\\n\\bar",hello="\"universe\\world\""`)
}
func BenchmarkFormatLabels(b *testing.B) {
ms := microprom.NewMetricSet(microprom.SyntaxPrometheusLegacy, nil)
const (
appVersion = "1.2.3"
node = "fcae8f43-87d4-4644-b28c-7bb1c340fcea"
region = "us-east"
status = "404"
)
names := microprom.NewLabelNames("app_version", "node", "region", "status")
b.Run("method=fmt.Sprintf", func(b *testing.B) {
for b.Loop() {
_ = fmt.Sprintf(`app_version=%q,node=%q,region=%q,status=%q`,
appVersion, node, region, status,
)
}
})
b.Run("method=FormatLabels", func(b *testing.B) {
for b.Loop() {
_ = ms.FormatLabels(names, appVersion, node, region, status)
}
})
}
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