test: Add unit test for internal/statsd/metrics.go

internal/statsd/metrics_test.go

@@ -0,0 +1,38 @@
+package statsd
+
+import (
+	"testing"
+
+	"github.com/GuanceCloud/cliutils/metrics"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestMetricsSetup(t *testing.T) {
+	// Unregister existing metrics first
+	metrics.Unregister(collectPointsTotalVec)
+	metrics.Unregister(httpGetBytesVec)
+
+	// Reset metric vectors
+	collectPointsTotalVec = nil
+	httpGetBytesVec = nil
+
+	// Call metricsSetup
+	metricsSetup()
+
+	// Verify metrics were initialized
+	assert.NotNil(t, collectPointsTotalVec, "collectPointsTotalVec should be initialized")
+	assert.NotNil(t, httpGetBytesVec, "httpGetBytesVec should be initialized")
+
+	// Test that metrics can accept values without error
+	err := func() (err error) {
+		defer func() {
+			if r := recover(); r != nil {
+				err = r.(error)
+			}
+		}()
+		collectPointsTotalVec.WithLabelValues().Observe(1.0)
+		httpGetBytesVec.WithLabelValues().Observe(100.0)
+		return nil
+	}()
+	assert.NoError(t, err, "metrics should accept values without error")
+}