Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/channels/api4/command_help_test.go

@@ -0,0 +1,38 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package api4
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/mattermost/mattermost-server/v6/model"
+)
+
+func TestHelpCommand(t *testing.T) {
+	th := Setup(t).InitBasic()
+	defer th.TearDown()
+
+	client := th.Client
+	channel := th.BasicChannel
+
+	HelpLink := *th.App.Config().SupportSettings.HelpLink
+	defer func() {
+		th.App.UpdateConfig(func(cfg *model.Config) { *cfg.SupportSettings.HelpLink = HelpLink })
+	}()
+
+	th.App.UpdateConfig(func(cfg *model.Config) { *cfg.SupportSettings.HelpLink = "" })
+	rs1, _, err := client.ExecuteCommand(channel.Id, "/help ")
+	require.NoError(t, err)
+	assert.Contains(t, rs1.Text, model.SupportSettingsDefaultHelpLink, "failed to default help link")
+
+	th.App.UpdateConfig(func(cfg *model.Config) {
+		*cfg.SupportSettings.HelpLink = "https://docs.mattermost.com/guides/user.html"
+	})
+	rs2, _, err := client.ExecuteCommand(channel.Id, "/help ")
+	require.NoError(t, err)
+	assert.Contains(t, rs2.Text, "https://docs.mattermost.com/guides/user.html", "failed to help link")
+}