Add silencing test

main.go

@@ -89,7 +89,7 @@ func main() {
 
 	router := route.New()
 
-	NewAPI(router.WithPrefix("/api"), alerts, silences)
+	NewAPI(router.WithPrefix("/api/v1"), alerts, silences)
 
 	go http.ListenAndServe(*listenAddress, router)
 

test/acceptance.go

@@ -52,16 +52,27 @@ func NewAcceptanceTest(t *testing.T, opts *AcceptanceOpts) *AcceptanceTest {
 	return test
 }
 
-func freeAddress() string {
-	// Let the OS allocate a free address, close it and hope
-	// it is still free when starting Alertmanager.
-	l, err := net.Listen("tcp", ":0")
-	if err != nil {
-		panic(err)
-	}
-	l.Close()
+var freeAdresses []string
 
-	return l.Addr().String()
+func freeAddress() string {
+	if len(freeAdresses) == 0 {
+		for i := 0; i < 100; i++ {
+			// Let the OS allocate a free address, close it and hope
+			// it is still free when starting Alertmanager.
+			l, err := net.Listen("tcp", ":0")
+			if err != nil {
+				panic(err)
+			}
+			defer l.Close()
+
+			freeAdresses = append(freeAdresses, l.Addr().String())
+		}
+	}
+
+	next := freeAdresses[0]
+	freeAdresses = freeAdresses[1:]
+
+	return next
 }
 
 // Alertmanager returns a new structure that allows starting an instance
@@ -85,6 +96,8 @@ func (t *AcceptanceTest) Alertmanager() *Alertmanager {
 
 	am.addr = freeAddress()
 
+	t.Logf("AM on %s", am.addr)
+
 	client, err := alertmanager.New(alertmanager.Config{
 		Address: fmt.Sprintf("http://%s", am.addr),
 	})

test/acceptance/simple_test.go

@@ -57,6 +57,63 @@ func TestSomething(t *testing.T) {
 	at.Run()
 }
 
+var silenceConfig = `
+routes:
+- send_to: "default"
+  group_wait:     1s
+  group_interval: 1s
+
+notification_configs:
+- name: "default"
+  send_resolved: true
+
+  webhook_configs:
+  - url: 'http://localhost:8090'
+`
+
+func TestSilencing(t *testing.T) {
+	t.Parallel()
+
+	at := NewAcceptanceTest(t, &AcceptanceOpts{
+		Tolerance: 150 * time.Millisecond,
+		Config:    somethingConfig,
+	})
+
+	am := at.Alertmanager()
+	co := at.Collector("webhook")
+
+	go NewWebhook(":8090", co).Run()
+
+	// No repeat interval is configured. Thus, we receive an alert
+	// notification every second.
+	am.Push(At(1), Alert("alertname", "test122").Active(1))
+	am.Push(At(1), Alert("alertname", "test2").Active(1))
+
+	co.Want(Between(2, 2.5),
+		Alert("alertname", "test1").Active(1),
+		Alert("alertname", "test2").Active(1),
+	)
+
+	// Add a silence that affects the first alert.
+	sil := Silence(2, 4.5).Match("alertname", "test1")
+	am.SetSilence(At(2.5), sil)
+
+	co.Want(Between(3, 3.5), Alert("alertname", "test2").Active(1))
+	co.Want(Between(4, 4.5), Alert("alertname", "test2").Active(1))
+
+	// Remove the silence so in the next interval we receive both
+	// alerts again.
+	am.DelSilence(At(4.5), sil)
+
+	co.Want(Between(5, 5.5),
+		Alert("alertname", "test1").Active(1),
+		Alert("alertname", "test2").Active(1),
+	)
+
+	// Start the flow as defined above and run the checks afterwards.
+	// at.Run()
+}
+
 var batchConfig = `
 routes:
 - send_to: "default"