Fix incorrect cli default values and default command (#34765)

cmd/cmd_test.go

@@ -0,0 +1,38 @@
+// Copyright 2025 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package cmd
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/urfave/cli/v3"
+)
+
+func TestDefaultCommand(t *testing.T) {
+	test := func(t *testing.T, args []string, expectedRetName string, expectedRetValid bool) {
+		called := false
+		cmd := &cli.Command{
+			DefaultCommand: "test",
+			Commands: []*cli.Command{
+				{
+					Name: "test",
+					Action: func(ctx context.Context, command *cli.Command) error {
+						retName, retValid := isValidDefaultSubCommand(command)
+						assert.Equal(t, expectedRetName, retName)
+						assert.Equal(t, expectedRetValid, retValid)
+						called = true
+						return nil
+					},
+				},
+			},
+		}
+		assert.NoError(t, cmd.Run(t.Context(), args))
+		assert.True(t, called)
+	}
+	test(t, []string{"./gitea"}, "", true)
+	test(t, []string{"./gitea", "test"}, "", true)
+	test(t, []string{"./gitea", "other"}, "other", false)
+}