chore: import upstream snapshot with attribution

pkg/observability/metrics/noop_sink_test.go

@@ -0,0 +1,42 @@
+package metrics
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNoopMetrics_ImplementsInterface(_ *testing.T) {
+	var _ Metrics = (*NoopMetrics)(nil)
+}
+
+func TestNoopMetrics_NoPanics(t *testing.T) {
+	m := NewNoopMetrics()
+
+	assert.NotPanics(t, func() {
+		m.Increment("key", map[string]string{"a": "b"})
+		m.Counter("key", map[string]string{"a": "b"}, 1)
+		m.Distribution("key", map[string]string{"a": "b"}, 1.5)
+		m.DistributionMs("key", map[string]string{"a": "b"}, time.Second)
+	})
+}
+
+func TestNoopMetrics_NilTags(t *testing.T) {
+	m := NewNoopMetrics()
+
+	assert.NotPanics(t, func() {
+		m.Increment("key", nil)
+		m.Counter("key", nil, 1)
+		m.Distribution("key", nil, 1.5)
+		m.DistributionMs("key", nil, time.Second)
+	})
+}
+
+func TestNoopMetrics_WithTags(t *testing.T) {
+	m := NewNoopMetrics()
+	tagged := m.WithTags(map[string]string{"env": "prod"})
+
+	assert.NotNil(t, tagged)
+	assert.Equal(t, m, tagged)
+}