Skip TestNetDialTimeout if network is unavailable

connection_test.go

@@ -24,6 +24,7 @@ import (
 	"errors"
 	"fmt"
 	"runtime"
+	"strings"
 	"sync"
 	"testing"
 	"time"
@@ -529,13 +530,25 @@ func TestNetDialTimeout(t *testing.T) {
 	// timeoutHostPort uses a blackholed address (RFC 6890) with a port
 	// reserved for documentation. This address should always cause a timeout.
 	const timeoutHostPort = "192.18.0.254:44444"
+	timeoutPeriod := testutils.Timeout(50 * time.Millisecond)
 
 	client := testutils.NewClient(t, nil)
 	defer client.Close()
 
-	ctx, cancel := NewContext(50 * time.Millisecond)
+	started := time.Now()
+	ctx, cancel := NewContext(timeoutPeriod)
 	defer cancel()
 
 	err := client.Ping(ctx, timeoutHostPort)
+	if !assert.Error(t, err, "Ping to blackhole address should fail") {
+		return
+	}
+
+	if strings.Contains(err.Error(), "network is unreachable") {
+		t.Skipf("Skipping test, as network interface may not be available")
+	}
+
+	d := time.Since(started)
 	assert.Equal(t, ErrTimeout, err, "Ping expected to fail with timeout")
+	assert.True(t, d >= timeoutPeriod, "Timeout should take more than %v, took %v", timeoutPeriod, d)
 }