add a function (testSetInterfaceNameChooseInterface) to choose any …

…interface that has an IP address assigned to it

this is a "hack" to supposedly make CircleCI happy

Signed-off-by: Matthieu Pignolet <[email protected]>

ping_test.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"context"
 	"errors"
+	"fmt"
 	"net"
 	"runtime"
 	"runtime/debug"
@@ -474,13 +475,45 @@ func TestStatisticsZeroDivision(t *testing.T) {
 	}
 }
 
+func testSetInterfaceNameChooseInterface(t *testing.T) (string, string) {
+	ifaces, err := net.Interfaces()
+	AssertNoError(t, err)
+
+	for _, i := range ifaces {
+		name := i.Name
+		// fix: this is a hack to choose any interface that is not `lo` to a permission issue in CircleCI
+		if name == "lo" {
+			continue
+		}
+		// find the local address to ping
+		addrs, err := i.Addrs()
+		AssertNoError(t, err)
+
+		for _, a := range addrs {
+			switch v := a.(type) {
+			case *net.IPAddr:
+				return name, v.IP.String()
+			case *net.IPNet:
+				return name, v.IP.String()
+			}
+		}
+	}
+
+	// we fail the test if no interface is available
+	AssertNoError(t, fmt.Errorf("no interface is available for testing"))
+	return "", ""
+}
+
 func TestSetInterfaceName(t *testing.T) {
-	pinger := New("localhost")
+	// we can ping `localhost`, refering to the address in the interface
+	interfaceName, localAddress := testSetInterfaceNameChooseInterface(t)
+
+	pinger := New(localAddress)
 	pinger.Count = 1
 	pinger.Timeout = time.Second
 
 	// Set loopback interface
-	pinger.InterfaceDevice = "lo"
+	pinger.InterfaceDevice = interfaceName
 	err := pinger.Run()
 	if runtime.GOOS == "linux" {
 		AssertNoError(t, err)