Add initial pingallbyhostname

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

integration/general_test.go

@@ -74,3 +74,58 @@ func TestPingAllByIP(t *testing.T) {
 	// 	t.Errorf("failed to tear down scenario: %s", err)
 	// }
 }
+
+func TestPingAllByHostname(t *testing.T) {
+	IntegrationSkip(t)
+
+	scenario, err := NewScenario()
+	if err != nil {
+		t.Errorf("failed to create scenario: %s", err)
+	}
+
+	spec := map[string]int{
+		"namespace3": len(TailscaleVersions),
+		"namespace4": len(TailscaleVersions),
+	}
+
+	err = scenario.CreateHeadscaleEnv(spec)
+	if err != nil {
+		t.Errorf("failed to create headscale environment: %s", err)
+	}
+
+	var allClients []*tsic.TailscaleInContainer
+
+	for namespace := range spec {
+		clients, err := scenario.GetClients(namespace)
+		if err != nil {
+			t.Errorf("failed to get tailscale clients: %s", err)
+		}
+
+		allClients = append(allClients, clients...)
+	}
+
+	err = scenario.WaitForTailscaleSync()
+	if err != nil {
+		t.Errorf("failed wait for tailscale clients to be in sync: %s", err)
+	}
+
+	success := 0
+
+	for _, client := range allClients {
+		for _, peer := range allClients {
+			err := client.Ping(peer.Hostname)
+			if err != nil {
+				t.Errorf("failed to ping %s from %s: %s", peer.Hostname, client.Hostname, err)
+			} else {
+				success++
+			}
+		}
+	}
+
+	t.Logf("%d successful pings out of %d", success, len(allClients)*len(allClients))
+
+	err = scenario.Shutdown()
+	if err != nil {
+		t.Errorf("failed to tear down scenario: %s", err)
+	}
+}