add test

internal/cli/configuration/network_test.go

@@ -21,6 +21,7 @@ import (
 	"net/http"
 	"net/http/httptest"
 	"testing"
+	"time"
 
 	"github.com/arduino/arduino-cli/internal/cli/configuration"
 	"github.com/stretchr/testify/require"
@@ -68,3 +69,41 @@ func TestProxy(t *testing.T) {
 	require.NoError(t, err)
 	require.Equal(t, http.StatusNoContent, response.StatusCode)
 }
+
+func TestConnectionTimeout(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		time.Sleep(5 * time.Second)
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	defer ts.Close()
+
+	doRequest := func(timeout int) (*http.Response, time.Duration, error) {
+		settings := configuration.NewSettings()
+		settings.Set("network.proxy", ts.URL)
+		if timeout != 0 {
+			settings.Set("network.connection_timeout", 2)
+		}
+		client, err := settings.NewHttpClient()
+		require.NoError(t, err)
+
+		request, err := http.NewRequest("GET", "http://arduino.cc", nil)
+		require.NoError(t, err)
+
+		start := time.Now()
+		resp, err := client.Do(request)
+		duration := time.Since(start)
+
+		return resp, duration, err
+	}
+
+	// Using default timeout (0), will wait indefinitely (in our case up to 5s)
+	response, elapsed, err := doRequest(0)
+	require.NoError(t, err)
+	require.Equal(t, http.StatusNoContent, response.StatusCode)
+	require.True(t, elapsed.Seconds() >= 4 && elapsed.Seconds() <= 6) // Adding some tolerance just in case...
+
+	// Setting a timeout of 1 seconds, will drop the connection after 1s
+	_, elapsed, err = doRequest(1)
+	require.Error(t, err)
+	require.True(t, elapsed.Seconds() >= 0.5 && elapsed.Seconds() <= 3) // Adding some tolerance just in case...
+}