add package microprom

This does not have test coverage yet, because the test coverage will be
in the `testing/` module, but `go mod tidy` will not run there until
there is a commit that has the microprom package itself.

1 files changed, 24 insertions, 0 deletions

diff --git a/microprom/labels_test.go b/microprom/labels_test.go
new file mode 100644
index 0000000..0414be8
--- /dev/null
+++ b/microprom/labels_test.go
@@ -0,0 +1,24 @@
+// SPDX-FileCopyrightText: 2026 Stefan Majewsky <majewsky@gmx.net>
+// SPDX-License-Identifier: Apache-2.0
+
+package microprom_test
+
+import (
+	"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\""`)
+}