MM-12356 Add cli command "command delete" (#9553)

* Add cli command for deleting commands

* Add code/test for delete command

* Fix test

* Add confirm flag

* Update as per comments

* Uncomment test

* Fix test

cmd/mattermost/commands/command_test.go

@@ -9,6 +9,7 @@ import (
 	"testing"
 
 	"github.com/mattermost/mattermost-server/api4"
+	"github.com/mattermost/mattermost-server/model"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
@@ -126,3 +127,34 @@ func TestCreateCommand(t *testing.T) {
 		})
 	}
 }
+
+func TestDeleteCommand(t *testing.T) {
+	th := api4.Setup().InitBasic()
+	defer th.TearDown()
+	url := "http://localhost:8000/test-command"
+	team := th.BasicTeam
+	user := th.BasicUser
+	th.LinkUserToTeam(user, team)
+
+	// Check the appropriate permissions are enforced.
+	defaultRolePermissions := th.SaveDefaultRolePermissions()
+	defer func() {
+		th.RestoreDefaultRolePermissions(defaultRolePermissions)
+	}()
+	id := model.NewId()
+	c := &model.Command{
+		DisplayName: "dn_" + id,
+		Method:      "G",
+		TeamId:      team.Id,
+		Username:    user.Username,
+		URL:         url,
+		Trigger:     "test",
+	}
+	th.AddPermissionToRole(model.PERMISSION_MANAGE_SLASH_COMMANDS.Id, model.TEAM_USER_ROLE_ID)
+	command, _ := th.Client.CreateCommand(c)
+	commands, _ := th.Client.ListCommands(team.Id, true)
+	assert.Equal(t, len(commands), 1)
+	CheckCommand(t, "command", "delete", command.Id)
+	commands, _ = th.Client.ListCommands(team.Id, true)
+	assert.Equal(t, len(commands), 0)
+}