Apply @makkes suggestion

cmd/flux/install.go

@@ -21,7 +21,6 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
-	"strings"
 	"time"
 
 	"github.com/manifoldco/promptui"
@@ -37,6 +36,7 @@ import (
 
 var installCmd = &cobra.Command{
 	Use:   "install",
+	Args:  cobra.NoArgs,
 	Short: "Install or upgrade Flux",
 	Long: `The install command deploys Flux in the specified namespace.
 If a previous version is installed, then an in-place upgrade will be performed.`,
@@ -115,10 +115,6 @@ func NewInstallFlags() installFlags {
 }
 
 func installCmdRun(cmd *cobra.Command, args []string) error {
-	if len(args) > 0 {
-		return fmt.Errorf(`flux install received unexpected positional arguments: "%s"`, strings.Join(args, `", "`))
-	}
-
 	ctx, cancel := context.WithTimeout(context.Background(), rootArgs.timeout)
 	defer cancel()
 

cmd/flux/install_test.go

@@ -39,8 +39,8 @@ func TestInstall(t *testing.T) {
 		},
 		{
 			name:   "invalid namespace",
-			args:   "install unexpected pos arg --namespace=example",
-			assert: assertError("flux install received unexpected positional arguments: \"unexpected\", \"pos\", \"arg\""),
+			args:   "install unexpectedPosArg --namespace=example",
+			assert: assertError(`unknown command "unexpectedPosArg" for "flux install"`),
 		},
 	}