Merge pull request #708 from prymitive/test-metrics

chore(backend): add test coverage for metrics handler

main.go

@@ -100,6 +100,12 @@ func setupRouter(router *gin.Engine) {
 	router.NoRoute(notFound)
 }
 
+func setupMetrics(router *gin.Engine) {
+	prom := ginprometheus.NewPrometheus("gin")
+	prom.MetricsPath = getViewURL("/metrics")
+	prom.Use(router)
+}
+
 func setupUpstreams() {
 	for _, s := range config.Config.Alertmanager.Servers {
 
@@ -207,9 +213,7 @@ func main() {
 	t = loadTemplate(t, "ui/build/index.html")
 	router.SetHTMLTemplate(t)
 
-	prom := ginprometheus.NewPrometheus("gin")
-	prom.MetricsPath = getViewURL("/metrics")
-	prom.Use(router)
+	setupMetrics(router)
 
 	if config.Config.Debug {
 		ginpprof.Wrapper(router)

main_test.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"net/http"
+	"net/http/httptest"
 	"testing"
 
 	"github.com/prymitive/karma/internal/config"
@@ -26,3 +28,15 @@ func TestLogConfig(t *testing.T) {
 		}
 	}
 }
+
+func TestMetrics(t *testing.T) {
+	mockConfig()
+	r := ginTestEngine()
+	setupMetrics(r)
+	req := httptest.NewRequest("GET", "/metrics", nil)
+	resp := httptest.NewRecorder()
+	r.ServeHTTP(resp, req)
+	if resp.Code != http.StatusOK {
+		t.Errorf("GET /metrics returned status %d", resp.Code)
+	}
+}