Add monitoring tests

internal/monitoring/monitoring_test.go

@@ -1 +1,34 @@
 package monitoring
+
+import (
+	"net/http"
+	"testing"
+	"time"
+)
+
+func TestMonitoringServe(t *testing.T) {
+	go Serve(&Options{Enabled: false, ListenAddress: "127.0.0.1:2112"})
+
+	// Sleep 0.5 second to ensure that the web server is running, to avoid fails because the request came too early
+	time.Sleep(500 * time.Millisecond)
+
+	// Test GET request, should fail
+	resp, err := http.Get("http://127.0.0.1:2112/metrics")
+	if err == nil {
+		t.Error("Failed to fail task")
+	}
+
+	go Serve(&Options{Enabled: true, ListenAddress: "127.0.0.1:2112"})
+
+	// Sleep 0.5 second to ensure that the web server is running, to avoid fails because the request came too early
+	time.Sleep(500 * time.Millisecond)
+
+	// Test GET request
+	resp, err = http.Get("http://127.0.0.1:2112/metrics")
+	if err != nil {
+		t.Error("Error while getting /metrics:", err)
+	}
+	if resp.StatusCode != http.StatusOK {
+		t.Errorf("Metric page returned %v != %v on GET", resp.StatusCode, http.StatusOK)
+	}
+}